WO2019229372A1 - Procede de purification d'un sel de lithium de bis(fluorosulfonyl)imide - Google Patents
Procede de purification d'un sel de lithium de bis(fluorosulfonyl)imide Download PDFInfo
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- WO2019229372A1 WO2019229372A1 PCT/FR2019/051250 FR2019051250W WO2019229372A1 WO 2019229372 A1 WO2019229372 A1 WO 2019229372A1 FR 2019051250 W FR2019051250 W FR 2019051250W WO 2019229372 A1 WO2019229372 A1 WO 2019229372A1
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- Prior art keywords
- fluorosulfonyl
- bis
- imide
- lithium salt
- silicon carbide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0446—Juxtaposition of mixers-settlers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0492—Applications, solvents used
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/082—Compounds containing nitrogen and non-metals and optionally metals
- C01B21/087—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms
- C01B21/093—Compounds containing nitrogen and non-metals and optionally metals containing one or more hydrogen atoms containing also one or more sulfur atoms
- C01B21/0935—Imidodisulfonic acid; Nitrilotrisulfonic acid; Salts thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a process for purifying a bis (fluorosulfonyl) imide lithium salt.
- Li-ion batteries require the development of higher power batteries. This involves increasing the nominal voltage of the Li-ion batteries. To reach the targeted voltages, electrolytes of high purity are necessary.
- Anions of sulfonylimide type by their very low basicity, are increasingly used in the field of energy storage in the form of inorganic salts in batteries, or organic salts in supercapacitors or in the field of liquids ionic.
- LiPF 6 the most currently used salt is LiPF 6 .
- This salt shows many disadvantages such as limited thermal stability, sensitivity to hydrolysis and therefore lower battery safety.
- new salts having the fluorosulfonyl group FSO 2 have been studied and have demonstrated many advantages such as better ionic conductivity and resistance to hydrolysis.
- LiFSI has shown very interesting properties that make it a good candidate to replace LiPF 6 .
- the present invention relates to a process for purifying a lithium salt of bis (fluorosulfonyl) imide in solution in at least one solvent S1, said process comprising at least one purification step carried out in:
- a steel equipment preferably made of carbon steel, comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating or by a coating of carbide of silicon.
- lithium salt of bis (fluorosulfonyl) imide lithium, or lithium bis (fluorosulfonyl) imide.
- the purification step is a step where the bis (fluorosulfonyl) imide lithium salt is in contact with water.
- the purification step can be a liquid-liquid extraction step, a concentration step, a decantation step, etc.
- the equipment may be a reactor, an evaporator, a mixer-settler, a liquid-liquid extraction column, a settling tank, an exchanger.
- the equipment may be a liquid-liquid extraction column or a mixer-settler.
- the equipment may be an evaporator or an exchanger.
- the equipment can be a decanter.
- the solvent S1 is an organic solvent.
- the organic solvent S1 is selected from the group consisting of esters, nitriles, ethers, and mixtures thereof.
- the solvent S1 is selected from ethyl acetate, butyl acetate, tetrahydrofuran, acetonitrile, diethyl ether, and mixtures thereof, the organic solvent S1 being preferably butyl acetate.
- the purification method according to the invention comprises the following steps: a) liquid-liquid extraction of the bis (fluorosulfonyl) imide lithium salt with deionized water, and recovery of an aqueous solution of said bis (fluorosulfonyl) imide lithium salt;
- a steel equipment preferably made of carbon steel, comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating or by a coating of carbide of silicon.
- the polymeric coating may be a coating comprising at least one of the following polymers: polyolefins such as for example polyethylene, or fluorinated polymers such as, for example, PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA ( copolymers of C 2 F 4 and perfluorinated vinyl ether), FEP (copolymers of tetrafluoroethylene and perfluoropropene, such as, for example, copolymer of C 2 F 4 and C 3 F 6 ), ETFE (copolymer of tetrafluoroethylene and ethylene, and FKM (copolymer of hexafluoropropylene and difluoroethylene).
- polyolefins such as for example polyethylene
- fluorinated polymers such as, for example, PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA ( copolymers of C
- the polymeric coating comprises at least one fluorinated polymer, and in particular PFA, PTFE or PVDF.
- the silicon carbide equipment is preferably a solid silicon carbide equipment.
- the equipment based on a fluoropolymer is preferably a solid fluoropolymer equipment.
- the fluorinated polymer is advantageously chosen from PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA (copolymers of C 2 F 4 and perfluorinated vinyl ether), and ETFE (copolymer of tetrafluoroethylene and ethylene). ).
- the fluoropolymer of the equipment is advantageously chosen from PVDF, PFA and ETFE.
- the process according to the invention is such that:
- step a) is carried out in equipment as defined above; and or
- step a ' is carried out in equipment as defined above; and or
- step b) is carried out in equipment as defined above; and or
- step c) is carried out in equipment as defined above.
- the mass content of LiFSI in the at least one solvent S1 is between 5% and 55%, preferably between 5% and 65%, preferably between 10% and 60%, advantageously between 10% and 55%. for example between 10% and 50%, in particular between 15% and 45%, and preferably between 25% and 40% by weight, relative to the total mass of the solution.
- Step a) may be carried out in equipment selected from an extraction column, a mixer-settler, and mixtures thereof.
- the liquid-liquid extraction step a) is carried out in:
- an extraction column or a mixer / settler made of steel, preferably carbon steel, said extraction column or said mixer-settling tank comprising an inner surface, said inner surface likely to be in contact with the lithium salt of bis (fluorosulfonyl) imide being covered by a polymeric coating preferably as defined above or by a coating of silicon carbide.
- the liquid-liquid extraction step a) is carried out in:
- An extraction column or a mixer-settler based on a fluorinated polymer such as for example PVDF (polyvinylidene fluoride), or PFA (copolymers of C 2 F 4 and perfluorinated vinyl ether); or
- an extraction column or a mixer / settler made of steel, preferably carbon steel, said extraction column or said mixer-settling tank comprising an inner surface, said inner surface likely to be in contact with the lithium salt of bis (fluorosulfonyl) imide being covered by a polymeric coating preferably as defined above.
- Mixers-settlers are well known to those skilled in the art. This is typically a single apparatus comprising a mixing chamber and a chamber of decantation, the mixing chamber comprising a stirring mobile advantageously allowing the mixing of the two liquid phases. In the settling chamber, phase separation is by gravity.
- Feeding the settler chamber from the mixer chamber can be by overflow, by the bottom of the mixing chamber, or by a perforated wall between the mixer chamber and the settler chamber.
- the extraction column may include:
- At least one lining such as for example a loose packing and / or a structured packing. These may be Rashig rings, Pall rings, Saddle rings, Berl saddles, Intalox saddles, or marbles;
- trays such as, for example, perforated trays, fixed valve trays, movable tray trays, cap trays, or combinations thereof;
- the polymeric material may comprise at least one polymer chosen from polyolefins such as, for example, polyethylene, and fluorinated polymers such as for example PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA (copolymers of C 2 F 4 and perfluorinated vinyl ether), FEP ( copolymers of tetrafluoroethylene and perfluoropropene, such as for example a copolymer of C 2 F 4 and C 3 F 6 ), ETFE (copolymer of tetrafluoroethylene and of ethylene, and FKM (copolymer of hexafluoropropylene and difluoroethylene).
- polyolefins such as, for example, polyethylene
- fluorinated polymers such as for example PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA (copolymers of C 2 F 4 and perflu
- the extraction column may also comprise quiches integral with the side walls of said column.
- the bicanages advantageously make it possible to limit the phenomenon of axial remixing.
- packing a solid structure adapted to increase the contact area between the two liquids contacted.
- the height and / or diameter of the extraction column typically depends on the nature of the liquids to be separated.
- the extraction column may be static or agitated.
- the extraction column is stirred, preferably mechanically. It comprises, for example, one or more agitating mobiles fixed on an axial rotary shaft.
- agitating mobiles fixed on an axial rotary shaft.
- turbines for example straight-blade turbines called Rushton turbines or turbines with curved blades or turbines with curved blades
- propellers for example propellers profiled blades
- disks and mixtures thereof.
- the agitation advantageously allows the formation of fine droplets to disperse a liquid phase in the other, and thus increase the interfacial exchange area.
- the stirring speed is chosen so as to maximize the interfacial exchange area.
- the mobile stirring member (s) is (are) made of a steel material, preferably carbon steel, comprising an outer surface, said outer surface likely to be in contact with the bis (fluorosulfonyl) imide lithium salt being covered with a polymeric coating preferably as defined above, or with a coating of silicon carbide.
- step a) of the process may be repeated at least once, preferably repeated from 1 to 10 times, preferably from 1 to 4 times.
- step a) is repeated, it can be carried out in several mixer-settlers in series.
- Step a) can be carried out continuously or discontinuously, preferably continuously.
- step a), of the purification method according to the invention comprises the addition of deionized water to the LiFSI solution in the above-mentioned organic solvent S1, for example obtained during synthesis steps. prior to the dissolution of said salt, and the extraction of said salt in water (aqueous phase).
- a quantity of deionized water corresponding to at least half of the mass of the initial solution can be added in a first extraction, then an amount greater than or equal to about 1/3 of the mass of the initial solution during the second extraction, then an amount greater than or equal to about 1/4 of the mass of the initial solution during the third extraction.
- step a) is such that the mass of deionized water is greater than or equal to one third, preferably greater than or equal to half, of the mass of the initial solution of LiFSI in the organic solvent. S1 (in the case of a single extraction, or for the first extraction only if step a) is repeated at least once).
- the method according to the invention may comprise the addition of a volume of deionized water in step a) greater than or equal to one-third, preferably greater than or equal to half the volume of solvent S1 of the initial solution.
- step a In case of multiple extractions (repetition of step a)), the extracted aqueous phases are combined together to form a single aqueous solution.
- Step a) advantageously makes it possible to obtain an aqueous phase and an organic phase, which are separated.
- Step b) is thus advantageously carried out on the aqueous solution extracted in step a) (single aqueous phase or aqueous phases combined in case of repetition of step a)).
- the organic phase (s) separated from the aqueous solution extracted in step a) (comprising the organic solvent S1 and LiFSI) are (are not) reintroduced in the subsequent steps b) to d) of the process, in particular they are (are) not combined later with the organic phases extracted during the step b) (comprising the organic solvent S2).
- an aqueous solution of LiFSI is advantageously obtained.
- the mass content of LiFSI in the aqueous solution is between 5% and 35%, preferably between 10% and 25%, relative to the total mass of the solution.
- the process according to the invention may comprise a concentration step a ') between step a) and step b), preferably to obtain an aqueous solution of LiFSI comprising a mass content of LiFSI of between 20% and 80%. in particular between 25% and 80%, preferably between 25% and 70%, and advantageously between 30% and 65% relative to the total mass of the solution.
- the concentration step can be carried out under reduced pressure, for example at a pressure of less than 50 mbar abs (preferably less than 30 mbar abs), and / or at a temperature of between 25 ° C and 60 ° C, preferably Between 25 ° C and 50 ° C, preferably between 25 ° C and 40 ° C.
- Step a ') can be performed in at least one equipment selected from an evaporator, an exchanger, and mixtures thereof.
- the concentration step a ') is carried out in:
- an exchanger or evaporator made of steel, preferably carbon steel, said exchanger or evaporator comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating of preferably as defined above or by a coating of silicon carbide.
- step a ') is carried out in:
- the purification method according to the invention comprises step a '). After concentration a ') of the aqueous solution obtained at the end of step a), a concentrated aqueous LiFSI solution is obtained.
- Step b) can be carried out on the aqueous solution obtained at the end of step a) or of the concentration step a ') or of any other intermediate step.
- Step b) can be carried out in equipment selected from an extraction column, a mixer-settler, and mixtures thereof.
- the liquid-liquid extraction step b) is carried out in:
- the liquid-liquid extraction step b) is carried out in:
- An extraction column or a mixer-settler based on a fluorinated polymer such as for example PVDF (polyvinylidene fluoride), or PFA (copolymers of C 2 F 4 and perfluorinated vinyl ether); or
- an extraction column or a mixer / settler made of steel, preferably carbon steel, said extraction column or said mixer-settling tank comprising an inner surface, said inner surface likely to be in contact with the lithium salt of bis (fluorosulfonyl) imide being covered by a polymeric coating preferably as defined above.
- the extraction column may include:
- At least one lining such as for example a loose packing and / or a structured packing. These may be Rashig rings, Pall rings, Saddle rings, Berl saddles, Intalox saddles, or marbles;
- trays such as, for example, perforated trays, fixed valve trays, movable tray trays, cap trays, or combinations thereof;
- the polymeric material may comprise at least one polymer chosen from polyolefins such as, for example, polyethylene, and fluorinated polymers such as for example PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA (copolymers of C 2 F 4 and perfluorinated vinyl ether), FEP ( copolymers of tetrafluoroethylene and perfluoropropene, such as for example a copolymer of C 2 F 4 and C 3 F 6 ), ETFE (copolymer of tetrafluoroethylene and of ethylene, and FKM (copolymer of hexafluoropropylene and difluoroethylene).
- polyolefins such as, for example, polyethylene
- fluorinated polymers such as for example PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA (copolymers of C 2 F 4 and perflu
- the extraction column may also comprise quiches integral with the side walls of said column.
- the bicanages advantageously make it possible to limit the phenomenon of axial remixing.
- the height and / or diameter of the extraction column typically depends on the nature of the liquids to be separated.
- the extraction column may be static or agitated.
- the extraction column is stirred, preferably mechanically. It comprises, for example, one or more agitating mobiles fixed on an axial rotary shaft.
- agitating mobiles fixed on an axial rotary shaft.
- turbines for example straight-blade turbines known as Rushton turbines or turbines with curved blades or turbines with curved blades
- propellers for example profiled blade propellers
- discs and mixtures thereof.
- the agitation advantageously allows the formation of fine droplets to disperse a liquid phase in the other, and thus increase the interfacial exchange area.
- the stirring speed is chosen so as to maximize the interfacial exchange area.
- the mobile stirring member (s) is (are) made of a steel material, preferably carbon steel, comprising an outer surface, said outer surface likely to be in contact with the bis (fluorosulfonyl) imide lithium salt being covered with a polymeric coating preferably as defined above, or with a coating of silicon carbide.
- Stage b) of the process according to the invention advantageously makes it possible to recover an organic phase, saturated with water, containing LiFSI (it is a solution of LiFSI in the at least one organic solvent S2, said solution being saturated with water).
- the extraction solvent S2 of the LiFSI salt dissolved in deionized water is advantageously:
- a good solvent for the LiFSI salt that is to say that the LiFSI may have a solubility greater than or equal to 10% by weight relative to the total weight of the sum LiFSI and solvent; and or
- the organic solvent S 2 is selected from the group consisting of esters, nitriles, ethers, chlorinated solvents, aromatic solvents, and mixtures thereof.
- the solvent S 2 is chosen from ethers, esters, and mixtures thereof.
- the solvent S 2 is chosen from methyl-t-butyl ether, cyclopentyl methyl ether, ethyl acetate, propyl acetate and butyl acetate, and mixtures thereof, said organic solvent S 2 being advantageously butyl acetate.
- step b) of the process may be repeated at least once, preferably repeated from 1 to 10 times, preferably from 1 to 4 times.
- step b) can be carried out in several mixer-settlers in series.
- the extracted organic phases are combined together to form a single organic solution.
- Step b) can be carried out continuously or discontinuously, preferably continuously.
- step b), of the purification process according to the invention comprises the addition of the at least one organic solvent S 2 to the aqueous LiFSI solution, to allow the dissolution of said salt, and the extraction of said salt in the organic phase.
- the mass quantity of organic solvent (s) S2 used can vary between 1/6 and 1 times the mass of the aqueous phase.
- the mass ratio of organic solvent (s) S 2 / water, during an extraction of step b) varies from 1/6 to 1/1, the number of extractions varying in particular from 2 to 10.
- the mass content of LiFSI in solution in the organic phase obtained at the end of step b) is between 5% and 35%, preferably between 10% and 25% by weight relative to the total mass of the solution.
- Step c) can include:
- Step c-1) advantageously makes it possible to obtain a solution of LiFSI in the at least one organic solvent S2 comprising a LiFSI content by mass of between 20% and 60%, and preferably between 30% and 50% by weight relative to to the total mass of the solution.
- the pre-concentration step c-1) can be carried out:
- under reduced pressure for example at a pressure of less than 50 mbar abs, in particular at a pressure of less than 30 mbar abs.
- Step c-1) may be performed in equipment selected from an evaporator or exchanger.
- the pre-concentration step c-1) is carried out in:
- an exchanger or an evaporator made of steel, preferably of carbon steel, said exchanger or evaporator comprising an inner surface, said inner surface capable of being in contact with the lithium salt of bis (fluorosulfonyl) imide being covered by a polymeric coating preferably as defined above or by a coating of silicon carbide.
- step c-1) is carried out in:
- an exchanger or evaporator made of steel, preferably carbon steel, said exchanger or evaporator comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a carbide coating of silicon.
- Step c-1) advantageously makes it possible to obtain a solution of LiFSI in the organic solvent S2 comprising a mass content of water of less than or equal to 20,000 ppm.
- Step c-2) advantageously makes it possible to obtain a solution of LiFSI in the organic solvent S2 comprising a mass content of water of less than or equal to 20,000 ppm.
- Step c-2) can be carried out in equipment chosen from an evaporator, such as for example a thin-film evaporator (and preferably a short-path thin-film evaporator), or an exchanger.
- an evaporator such as for example a thin-film evaporator (and preferably a short-path thin-film evaporator), or an exchanger.
- step c-2) is carried out in a short-path thin film evaporator.
- Step c-2) can be performed in:
- an exchanger or evaporator made of steel, preferably carbon steel, said exchanger or evaporator comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating of preferably as defined above or by a coating of silicon carbide.
- the purification process according to the invention comprises a step c-2) of concentrating the bis (fluorosulfonyl) imide lithium salt by evaporation of said at least one organic solvent S 2, in a thin film evaporator. short journey, preferably under the following conditions:
- the concentration step c-2) is carried out at a pressure of between 10 -2 mbar abs and 5 mbar abs, preferably between 5.10 -2 mbar abs and 2 mbar abs, preferably between 5.10 -1 and 2 mbar abs, even more preferably between 0.1 and 1 mbar abs, and in particular between 0.1 and 0.6 mbar abs.
- step c-2) is carried out at a temperature between 30 ° C and 95 ° C, preferably between 40 ° C and 900, preferably between 40 ° C and 85 ° C, and in particular between 50 ° C and 80 ° C.
- step c-2) is carried out with a residence time of less than or equal to 10 minutes, preferentially less than or equal to 5 minutes, and preferably less than or equal to 3 minutes.
- the term “residence time” means the time that elapses between the entry of the lithium salt solution of bis (fluorosulfonyl) imide (in particular obtained at the result of step b) above) in the evaporator and the outlet of the first drop of the solution.
- the temperature of the condenser of the short-path thin-film evaporator is between -55 ° C. and 10 ° C., preferably between -50 ° C. and 5 ° C., more preferably between -50 ° C. and -5 ° C. 45 ° C and -10 ° Cpt advantageously between -40 ° C and -15 ° C.
- Short-path thin-film evaporators are also known under the name “Wiped film short path” (WFSP). They are typically so called because the vapors generated during evaporation make a “short trip" (short distance) before being condensed to the condenser.
- WFSP Wiped film short path
- evaporators marketed by the companies Buss SMS Ganzler ex Luwa AG, UIC Gmbh or VTA Process.
- short-path thin-film evaporators may include a solvent vapor condenser positioned within the apparatus itself (particularly in the center of the apparatus), unlike other types of film evaporators. thin (which are not short path) in which the condenser is located outside the device.
- the formation of a thin film of product to be distilled on the internal hot wall of the evaporator can typically be provided by continuously spreading on the evaporation surface by mechanical means. specified below.
- the evaporator may in particular be provided at its center, an axial rotor on which are mounted the mechanical means that allow the formation of the film on the wall.
- They may be rotors equipped with fixed blades: three-blade or four-blade lobed rotors in flexible or rigid materials, distributed over the entire height of the rotor or rotors equipped with moving blades, pallets, scrapers, guided rubbers.
- the rotor may be constituted by a succession of articulated pallets on pivot mounted on a shaft or axis via radial supports.
- Other rotors may be equipped with mobile rollers mounted on secondary axes and said rollers are pressed on the wall by centrifugation.
- the rotational speed of the rotor which depends on the size of the apparatus can be readily determined by those skilled in the art.
- the LiFSI salt solution is introduced into the short-path thin film evaporator with a flow rate of between 700 g / h and 1200 g / h, preferably between 900 g / h and 110 g / h for a evaporation surface of 0.04m 2 .
- the LiFSI can be obtained in solid form, and in particular in crystallized form, or in the form of a concentrated solution, the concentrated solution comprising less than 35% by weight of residual solvent, preferably less than 30% by weight.
- the method according to the invention further comprises a step d) of crystallization of the lithium salt of bis (fluorosulfonyl) imide obtained at the end of step c) mentioned above.
- the LiFSI is crystallized in the cold, in particular at a temperature of less than or equal to 25 ° C.
- the crystallization step d) of LiFSI is carried out in an organic solvent S3 ("crystallization solvent") chosen from chlorinated solvents, such as, for example, dichloromethane, from alkanes such as, for example, pentane, hexane, cyclohexane, or heptane, and from aromatic solvents, such as, for example, toluene, in particular at a temperature of less than or equal to 25 ° C.
- the crystallized LiFSI at the end of step d) is recovered by filtration.
- the initial solution of lithium salt of bis (fluorosulfonyl) imide in at least one solvent S1 can come from any synthesis of the bis (fluorosulfonyl) imide lithium salt, comprising in particular the following steps:
- the lithium salt of bis (fluorosulfonyl) imide is preferably obtained in solution in an organic solvent (corresponding in particular to the solvent S1), at a mass concentration of between 5% and 50% by weight. relative to the total mass of the solution.
- Step iv) corresponds to a cation exchange reaction, subsequent to step (iii), comprising the reaction between the alkaline earth salt of bis (fluorosulfonyl) imide and a lithium salt, to obtain the salt of lithium bis (fluorosulfonyl) imide.
- Step iv) is in particular a cation exchange reaction for converting a compound of formula (I) mentioned above F- (SO 2 ) -NM- (SO 2 ) -F (I), M representing a monovalent cation of alkali metal or alkaline earth metal, in lithium salt of bis (fluorosulfonyl) imide.
- the lithium salt is selected from LiF, LiCI, L i2 C0 3, LiOH, LIN0 3, LiBF 4, and mixtures thereof.
- the lithium salt may be dissolved in a polar organic solvent selected from the following families: alcohols, nitriles and carbonates.
- a polar organic solvent selected from the following families: alcohols, nitriles and carbonates.
- alcohols such as methanol, ethanol, acetonitrile, dimethylcarbonate, ethylmethylcarbonate, and mixtures thereof.
- the molar ratio of the compound of formula (I) relative to the lithium salt may vary: it may be at least 1 and less than 5.
- Preferably the molar ratio of compound of formula (I) / lithium salt is between 1, 2 and 2.
- the reaction medium may be stirred for 1 to 24 hours, and / or at a temperature of, for example, 0 ° C to 50 ° C.
- the reaction medium can be filtered and then optionally concentrated.
- the concentration step can optionally be carried out by a thin-film evaporator, an atomizer, an evaporator, or any other apparatus for solvent evaporation.
- the filtration can be carried out using a filter or wringer.
- Step iv) can be carried out in a reactor based on silicon carbide or based on a fluoropolymer preferably as defined above; or in a steel reactor comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating or by a coating of silicon carbide.
- the polymeric coating may be a coating comprising at least one of the following polymers: polyolefins such as for example polyethylene, or fluorinated polymers such as, for example, PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PFA ( copolymers of C 2 F 4 and perfluorinated vinyl ether), FEP (copolymers of tetrafluoroethylene and perfluoropropene, such as, for example, copolymer of C 2 F 4 and C 3 F 6 ), ETFE (copolymer of tetrafluoroethylene and ethylene, and FKM (copolymer of hexafluoropropylene and difluoroethylene)
- the polymeric coating comprises at least one fluorinated polymer, and in particular PFA, PTFE or PVDF.
- the reactor of step iv) is a stirred reactor equipped with mobile stirrer (s).
- turbines for example straight-blade turbines called Rushton turbines or turbines with curved blades or blades turbines curves
- helical ribbons for example, propellers (eg profiled blade propellers), anchors, and combinations thereof.
- the mobile stirring device (s) can (wind) be fixed (s) on a central stirring shaft, and may be identical or different in nature.
- the stirring shaft may be driven by a motor, advantageously located outside the reactor.
- the design and size of the agitating mobiles can be chosen by those skilled in the art depending on the type of mixture to be produced (mixture of liquids, liquid and solid mixture, mixture of liquid and gas, mixture of liquid, gas and solid) and desired mixing performance.
- the stirring mobile is selected from the stirring motives best adapted to ensure good homogeneity of the reaction medium.
- the mobile stirring member (s) is (are) made of a steel material, preferably carbon steel, comprising an outer surface, said outer surface likely to be in contact with the bis (fluorosulfonyl) imide lithium salt being covered with a polymeric coating preferably as defined above, or with a coating of silicon carbide.
- the purification method according to the invention comprises the following steps:
- step c) concentration of the bis (fluorosulfonyl) imide lithium salt by evaporation of said organic solvent S2, said step c) comprising:
- step c-2) of concentration of the solution obtained in step c-1); d) optionally crystallization of the lithium salt of bis (fluorosulfonyl) imide; at least one of steps a), a '), b), or c-1), preferably all steps a), a'), b) and c-1), being carried out in:
- a steel equipment preferably made of carbon steel, comprising an inner surface, said inner surface capable of being in contact with the bis (fluorosulfonyl) imide lithium salt being covered by a polymeric coating, preferably as defined above, or by a coating of silicon carbide.
- the purification process according to the invention advantageously leads to a LiFSI, having a high purity, and preferentially to a LiFSI having a high purity and a reduced or even zero content of metal ions.
- metal ions is intended in particular to mean ions derived from transition metals (such as, for example, Cr, Mn, Fe, Ni, Cu), ions derived from poor metals (such as for example Al, Zn and Pb), ions derived from alkali metals (such as for example Na), ions derived from alkaline earth metals (such as for example Mg and Ca), and ions derived from silicon.
- the process according to the invention advantageously leads to a LiFSI having a reduced or even zero content in ions derived from the following metals: Cr, Mn, Fe, Ni, Cu, Al, Zn, Mo, Co, Pb, Na, If, Mg, Ca.
- the process according to the invention advantageously leads to a composition comprising at least 99.9% by weight of LiFSI, preferably at least 99.95% by weight, preferably at least 99.99% by weight of LiFSI, and said LiFSI optionally comprising at least one of the following impurities in the indicated contents: 0 ⁇ H 2 0 ⁇ 100 ppm, 0 ⁇ Cl ⁇ 100 ppm, 0 ⁇ S0 4 2 ⁇ 100 ppm, 0 ⁇ F ⁇ 200 ppm, 0 ⁇ FS0 3 Li ⁇ 20 ppm, 0 ⁇ FSO2NH2 £ 20 ppm, 0 ⁇ K ⁇ 100 ppm, 0 ⁇ Na ⁇ 10 ppm, 0 ⁇ Si ⁇ 40 ppm, 0 ⁇ Mg ⁇ 10 ppm, 0 ⁇ Fe ⁇ 10 ppm ⁇ 0 Oppm, 0 ⁇ Pb ⁇ 1 Oppm, 0 ⁇ Cu ⁇ 10 ppm,
- ppm means ppm by weight
- between x and y" or “ranging from x to y” means an interval in which the terminals x and y are included.
- the temperature "between 30 and 100 ° C” includes in particular the values 30 ° C and 100 ° C.
- the bis (fluorosulfonyl) imide lithium salt sample is dissolved in ultrapure water. Two dilutions were used: 1 g / l for Na and K determination and 0.1 g / l for Lithium analysis.
- ICP-AES Inductively Coupled Plasma Spectrometry
- Power output of the Plasma source 1,150 W
- Nebulization gas flow rate 0.7 L min
- Cooling flow 16 L / min
- Torch height 12 mm
- Wavelength range 167 nm to 847 nm.
- the ICP-AES quantization method for measuring Li, Na, K used 5 calibration points.
- ICP-AES data are obtained on an ICAP 6500 spectrometer (Thermo Electronics).
- ICAP 6500 spectrometer Thermo Electronics.
- the semi- quantitative is based on two calibration points.
- ICP-AES is preferred to cationic chromatography in aqueous solution for the measurement of Li, Na, K elements.
- Example 1 Purification of a solution of LiFSI in butyl acetate with a dry extract of 42.8% containing 670 ppm of chloride, 23 ppm of sulfate, 300 ppm of potassium and no sodium detected
- 3153 g of the above solution are extracted in a glass separating funnel four times with successively 1570 g, 1045 g, 792 g and 792 g of water.
- the aqueous phases are all collected and concentrated under vacuum in a glass reactor to a solids content of 41.5%.
- This aqueous solution is then extracted four times into a glass separating funnel with 1342 g, 1342 g, 672 g and 672 g of butyl acetate successively.
- the organic phases are then combined and concentrated under vacuum in a glass reactor to a solids content of 41%.
- LiFSI precipitates and is then recovered under anhydrous atmosphere by filtration. The solid is dried under vacuum at room temperature.
- the ionic chromatographic analysis of LiFSI obtained shows 8 ppm of chloride, an absence of sulfate detection, 12 ppm of potassium and 55 ppm of sodium.
- Example 2 Purification of a solution of LiFSI in butyl acetate with a dry extract of 41.8% containing 690 ppm of chloride, 25 ppm of sulfate, 315 ppm of potassium and no sodium detected
- 3255 g of the above solution are extracted in a PTFE separatory funnel four times with 1620 g, 1079 g, 818 g and 818 g of water successively.
- the aqueous phases are all collected and concentrated under vacuum in a PFA coated stainless steel reactor to a solids content of 41%.
- This aqueous solution is then extracted four times in a PTFE separatory funnel with 1385 g, 1385 g, 694 g and 694 g of butyl acetate.
- the organic phases are then combined and concentrated under vacuum in a PFA coated stainless steel reactor to a solids content of 42%.
- LiFSI precipitates and is then recovered under anhydrous atmosphere by filtration. The solid is dried under vacuum at room temperature.
- the ionic chromatographic analysis of the LiFSI obtained shows 10 ppm of chlorides, an absence of sulphate detection, 10 ppm of potassium and an absence of sodium detection.
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- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
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Abstract
Description
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Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/058,730 US20210214239A1 (en) | 2018-06-01 | 2019-05-28 | Process for purifying a lithium bis(fluorosulfonyl)imide salt |
| KR1020207034308A KR102764559B1 (ko) | 2018-06-01 | 2019-05-28 | 리튬 비스(플루오로술포닐)이미드 염을 정제하기 위한 프로세스 |
| JP2020567036A JP2021526500A (ja) | 2018-06-01 | 2019-05-28 | リチウム ビス(フルオロスルホニル)イミド塩を精製するための方法 |
| CN201980035233.6A CN112165978A (zh) | 2018-06-01 | 2019-05-28 | 纯化双(氟磺酰基)酰亚胺锂盐的方法 |
| EP19735365.9A EP3801808A1 (fr) | 2018-06-01 | 2019-05-28 | Procede de purification d'un sel de lithium de bis(fluorosulfonyl)imide |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1854766A FR3081723B1 (fr) | 2018-06-01 | 2018-06-01 | Procede de purification d'un sel de lithium de bis(fluorosulfonyl)imide |
| FR1854766 | 2018-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2019229372A1 true WO2019229372A1 (fr) | 2019-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2019/051250 Ceased WO2019229372A1 (fr) | 2018-06-01 | 2019-05-28 | Procede de purification d'un sel de lithium de bis(fluorosulfonyl)imide |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20210214239A1 (fr) |
| EP (1) | EP3801808A1 (fr) |
| JP (1) | JP2021526500A (fr) |
| KR (1) | KR102764559B1 (fr) |
| CN (1) | CN112165978A (fr) |
| FR (1) | FR3081723B1 (fr) |
| WO (1) | WO2019229372A1 (fr) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3059993A1 (fr) * | 2016-12-08 | 2018-06-15 | Arkema France | Procede de sechage et de purification du sel de lithium de bis(fluorosulfonyl)imide |
| CN117480114A (zh) * | 2021-06-30 | 2024-01-30 | 株式会社日本触媒 | 磺酰亚胺水溶液的精制方法、非水电解液的制造方法及电解质组合物的制造方法 |
| KR102720708B1 (ko) * | 2023-09-08 | 2024-10-22 | 주식회사 천보비엘에스 | 리튬 비스(플루오로설포닐)이미드 용액 및 이를 포함하는 전지 |
| WO2025229655A1 (fr) * | 2024-04-30 | 2025-11-06 | Gfcl Ev Products Limited | Procédé de préparation et de purification de bis(fluorosulfonyl)imide de lithium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2660196A1 (fr) * | 2011-03-03 | 2013-11-06 | Nippon Soda Co., Ltd. | Procédé de fabrication de sel d'ammonium de fluorosulfonylimide |
| US20130323155A1 (en) * | 2011-03-03 | 2013-12-05 | Nippon Soda Co., Ltd. | Process for producing fluorine-containing sulfonylimide salt |
| WO2015158979A1 (fr) | 2014-04-18 | 2015-10-22 | Arkema France | Preparation d'imides contenant un groupement fluorosulfonyle |
| US20180141901A1 (en) * | 2015-05-06 | 2018-05-24 | Lonza Ltd | Method for preparation of bis(fluorosulfonyl)-imide |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101345271B1 (ko) * | 2009-11-27 | 2013-12-27 | 가부시기가이샤 닛뽕쇼꾸바이 | 플루오로설포닐이미드염 및 플루오로설포닐이미드염의 제조방법 |
| WO2011149095A1 (fr) * | 2010-05-28 | 2011-12-01 | 株式会社日本触媒 | Sel de métal alcalin de fluorosulfonylimide, et procédé de production dudit sel de métal alcalin |
| CA2904489C (fr) * | 2013-03-18 | 2017-02-14 | Nippon Soda Co., Ltd. | Procede de production de sel de metal alcalin de disulfonylamine |
| ES2545898T3 (es) * | 2013-07-11 | 2015-09-16 | Lonza Ltd | Método para la preparación de compuestos de imidodisulfurilo |
| FR3014439B1 (fr) * | 2013-12-05 | 2018-03-23 | Rhodia Operations | Procede de preparation de l'acide bis-fluorosulfonylimide et de ses sels. |
| KR20180083896A (ko) * | 2015-11-13 | 2018-07-23 | 론자 리미티드 | 비스(플루오로설포닐)-이미드 및 그 염의 제조 방법 |
| JP2019089663A (ja) * | 2016-03-31 | 2019-06-13 | セントラル硝子株式会社 | ビス(ハロゲン化スルホニル)イミド酸金属塩の製造方法 |
| JP6663986B2 (ja) * | 2016-05-27 | 2020-03-13 | 株式会社日本触媒 | ビス(フルオロスルホニル)イミドアルカリ金属塩の製造方法 |
-
2018
- 2018-06-01 FR FR1854766A patent/FR3081723B1/fr not_active Expired - Fee Related
-
2019
- 2019-05-28 JP JP2020567036A patent/JP2021526500A/ja active Pending
- 2019-05-28 US US17/058,730 patent/US20210214239A1/en not_active Abandoned
- 2019-05-28 WO PCT/FR2019/051250 patent/WO2019229372A1/fr not_active Ceased
- 2019-05-28 KR KR1020207034308A patent/KR102764559B1/ko active Active
- 2019-05-28 EP EP19735365.9A patent/EP3801808A1/fr not_active Withdrawn
- 2019-05-28 CN CN201980035233.6A patent/CN112165978A/zh active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2660196A1 (fr) * | 2011-03-03 | 2013-11-06 | Nippon Soda Co., Ltd. | Procédé de fabrication de sel d'ammonium de fluorosulfonylimide |
| US20130323155A1 (en) * | 2011-03-03 | 2013-12-05 | Nippon Soda Co., Ltd. | Process for producing fluorine-containing sulfonylimide salt |
| WO2015158979A1 (fr) | 2014-04-18 | 2015-10-22 | Arkema France | Preparation d'imides contenant un groupement fluorosulfonyle |
| US20180141901A1 (en) * | 2015-05-06 | 2018-05-24 | Lonza Ltd | Method for preparation of bis(fluorosulfonyl)-imide |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP3801808A1 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3081723A1 (fr) | 2019-12-06 |
| CN112165978A (zh) | 2021-01-01 |
| EP3801808A1 (fr) | 2021-04-14 |
| JP2021526500A (ja) | 2021-10-07 |
| US20210214239A1 (en) | 2021-07-15 |
| KR20210013697A (ko) | 2021-02-05 |
| KR102764559B1 (ko) | 2025-02-06 |
| FR3081723B1 (fr) | 2022-04-15 |
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