WO2022097945A1 - 리튬 이차전지용 비수계 전해액 및 이를 포함하는 리튬 이차전지 - Google Patents
리튬 이차전지용 비수계 전해액 및 이를 포함하는 리튬 이차전지 Download PDFInfo
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- WO2022097945A1 WO2022097945A1 PCT/KR2021/014194 KR2021014194W WO2022097945A1 WO 2022097945 A1 WO2022097945 A1 WO 2022097945A1 KR 2021014194 W KR2021014194 W KR 2021014194W WO 2022097945 A1 WO2022097945 A1 WO 2022097945A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0567—Liquid materials characterised by the additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0568—Liquid materials characterised by the solutes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
- H01M10/0569—Liquid materials characterised by the solvents
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
- H01M2300/0028—Organic electrolyte characterised by the solvent
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- 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 non-aqueous electrolyte for a lithium secondary battery capable of achieving a high-rate charge/discharge and life improvement through continuous decomposition suppression of the electrolyte by forming a stable film on the positive and negative electrodes under high voltage, and a lithium secondary battery including the same.
- the battery which is the power source
- the battery is also small, lightweight, capable of charging and discharging for a long time, and is a secondary battery with excellent high rate characteristics.
- the development is strongly demanded.
- a lithium battery specifically, a lithium ion battery (LIB) is a battery that can best meet these requirements, has a high energy density and is easy to design, and thus is adopted as a power source for many portable devices.
- LIB lithium ion battery
- lithium secondary batteries are mostly composed of a negative electrode and a positive electrode capable of occluding and releasing lithium ions, and a non-aqueous electrolyte solution in which lithium salts such as LiPF 6 and LiBF 4 are dissolved in an appropriate amount in a mixed carbonate-based organic solvent.
- the positive electrode active material As the lithium secondary battery is charged and discharged, the positive electrode active material is structurally collapsed and metal ions are eluted from the surface of the positive electrode.
- the eluted metal ions are electrodeposited on the anode and deteriorate the cathode. Such deterioration tends to be accelerated when the potential of the positive electrode increases or the battery is exposed to high temperatures.
- the lithium secondary battery has a low voltage phenomenon (voltage drop) due to foreign substances contained in raw materials or mixed in the process, and this phenomenon is aggravated due to a minute short circuit in the battery, causing the cell operation to stop. there is.
- This disadvantage is a defect in the final stage of the manufacturing process, so the loss is large.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-256995
- Patent Document 2 US Patent No. 7,033,707
- Patent Document 3 Japanese Patent Laid-Open No. 2003-059529
- the present invention is to solve the conventional problems, and by including a lithium salt including an anion having a sulfonimide group and a propanesulfone group or an ethylene sulfate group as an additive to a non-aqueous electrolyte solution for a lithium secondary battery, a stable film is formed on the electrode surface.
- a lithium salt including an anion having a sulfonimide group and a propanesulfone group or an ethylene sulfate group as an additive to a non-aqueous electrolyte solution for a lithium secondary battery, a stable film is formed on the electrode surface.
- the present invention provides a lithium secondary battery excellent in high rate charge/discharge by forming a stable film on the electrode surface, thereby reducing the film resistance by fixing anions that hinder lithium transport to the electrode film, and improving the lithium ion transport rate want to
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery comprising an electrolyte salt, an organic solvent and an additive, wherein the additive includes lithium containing an anion having a sulfonimide group and a propanesulfone group or an ethylene sulfate group To provide a salt, non-aqueous electrolyte for a lithium secondary battery.
- the present invention provides a non-aqueous electrolyte for a secondary battery, wherein the additive is a lithium salt represented by the following formula (1).
- X is CH 2 or O
- R is hydrogen, fluorine, or an alkyl group having 1 to 4 carbon atoms substituted with fluorine.
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, wherein, in Formula 1, R is F or CF 3 .
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, wherein Chemical Formula 1 is represented by any one of the following Chemical Formulas A to D.
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, wherein the additive is included in an amount of 0.01 wt% to 10 wt% based on the total weight.
- the electrolyte salt is LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiFSI(Lithium bis(fluorosulfonyl)imide, LiN(SO 2 F) 2 ), LiBETI(lithium bisperfluoroethanesulfonimide, LiN(SO 2 CF 2 CF 3 ) 2 and LiTFSI(lithium ( bis) trifluoromethanesulfonimide, LiN(SO 2 CF 3 ) 2 ) It provides a non-aqueous electrolyte for a lithium secondary battery that is selected from the group consisting of.
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, wherein the concentration of the electrolyte salt is 0.1M to 3M.
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, wherein the organic solvent includes at least one selected from the group consisting of ethers, esters, amides, linear carbonates, and cyclic carbonates.
- the present invention provides a non-aqueous electrolyte for a lithium secondary battery, characterized in that the lithium secondary battery has an operating voltage of 4.0V or more.
- the present invention provides a lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and the non-aqueous electrolyte for the lithium secondary battery.
- the non-aqueous electrolyte for a lithium secondary battery according to the present invention contains a lithium salt including an anion having a sulfonimide group and a propanesulfone group or an ethylene sulfate group as an additive, thereby forming a stable film in which the anion is fixed on the electrode surface. show the effect.
- the lithium secondary battery containing the non-aqueous electrolyte for lithium secondary batteries according to the present invention forms a stable film on the electrode surface even under high voltage, thereby improving lifespan through continuous suppression of decomposition of the electrolyte and exhibiting excellent charging and discharging characteristics.
- FIG. 1 is a schematic diagram showing an electrode film (Solid Electrolyte Interphase, SEI) formation and operation mechanism by the additive of the present invention.
- SEI Solid Electrolyte Interphase
- Figure 2 is a reaction scheme showing the reductive decomposition mechanism of the additive according to Example 1 of the present invention. From this, it can be confirmed that radicals and anions generated through the above mechanism can further react with a solvent or additive to form a polymer film.
- the present invention relates to a non-aqueous electrolyte for a lithium secondary battery comprising an electrolyte salt, an organic solvent and an additive, wherein the additive is a lithium salt containing an anion having a sulfonimide group and a propane sultone group or an ethylene sulfate group.
- An aqueous electrolyte solution is provided.
- the lithium salt including an anion having a sulfonimide group and a propane sultone group or an ethylene sulfate group as the additive may be a lithium salt represented by the following formula (1).
- X is CH 2 or O
- R is hydrogen, fluorine, or an alkyl group having 1 to 4 carbon atoms substituted with fluorine.
- R may be fluorine or an alkyl group having 1 to 4 carbon atoms substituted with fluorine, preferably a fluoro group (-F) or a trifluoromethyl group (-CF 3 ) , more preferably a fluoro group (-F).
- lithium salt represented by Formula 1 may more preferably be any one of lithium salts represented by any one of Formulas A to D.
- the non-aqueous electrolyte solution for a lithium secondary battery of the present invention includes a lithium salt including an anion having a sulfonimide group and a propanesulfone group or an ethylene sulfate group as the additive, thereby forming a stable film in which the anion is fixed on the electrode surface.
- the lithium secondary battery containing the additive forms a stable film on the electrode surface even under a high voltage, thereby improving lifespan through continuous suppression of decomposition of the electrolyte and exhibiting excellent charge/discharge characteristics.
- lithium difluoro oxalatoborate LiFOB
- lithium bisoxalatoborate LiB(C 2 O 4 ) 2
- LiBOB fluoroethylene carbonate
- FEC fluoroethylene carbonate
- VC vinylene carbonate
- VEC vinylethylene carbonate
- divinyl sulfone ethylene sulfite
- propylene sulfite diallyl sulfonate
- ethane sultone An additive selected from the group consisting of propane sulton (PS), butane sulton, ethene sultone, butene sultone, and propene sultone (PRS) may be further included.
- PS propane sulton
- PRS propene sultone
- the content of the lithium salt containing an anion having a sulfonimide group and a propane sultone group or an ethylene sulfate group may be 0.01 wt% to 10 wt% based on the total weight of the electrolyte, preferably 0.01 wt% to 5 wt% may be, and more preferably 0.1 wt% to 3 wt%.
- the content of the lithium salt is less than the above range, the formation and stabilization effect of a film (Solid Electrolyte Interphase, SEI) on the electrode surface is insignificant, and when the content of the lithium salt exceeds the above range, the resistance due to the excess additive increases problems may arise. Therefore, the content of the lithium salt preferably satisfies the above range.
- the non-aqueous electrolyte for a lithium secondary battery of the present invention may include an electrolyte salt, wherein the lithium salt is LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiFSI(Lithium bis(fluorosulfonyl)imide, LiN(SO 2 F) 2 ), LiBETI(lithium bisperfluoroethanesulfonimide, LiN(SO) 2 CF 2 CF 3 ) 2 and LiTFSI (lithium (bis)trifluoromethanesulfonimide, LiN(SO 2 CF 3 ) 2 ) may include at least one selected from the group consisting of.
- the lithium salt is LiCl
- the concentration of the electrolyte salt may be 0.1M to 3.0M, preferably 0.5M to 2.5M, and more preferably 0.8M to 2.0M. If the concentration of the electrolyte salt is less than 0.1M, the conductivity of the electrolyte is lowered to deteriorate the electrolyte performance, and when the concentration of the electrolyte salt exceeds 3.0M, there is a problem in that the viscosity of the electrolyte increases and the mobility of lithium ions decreases. Therefore, the concentration of the electrolyte salt preferably satisfies the above range.
- the electrolyte salt serves as a source of lithium ions in the battery to enable the basic operation of the lithium secondary battery.
- the electrolyte salt of the non-aqueous electrolyte for a lithium secondary battery of the present invention may be used by mixing an imide lithium salt and a lithium salt other than the lithium imide salt.
- the lithium imide salt is LiFSI (Lithium bis(fluorosulfonyl)imide, LiN(SO 2 F) 2 ), LiBETI (lithium bisperfluoroethanesulfonimide, LiN(SO 2 CF 2 CF 3 ) 2 and LiTFSI (lithium (bis)trifluoromethanesulfonimide, LiN( SO 2 CF 3 ) 2 ) may be at least one selected from the group consisting of, and the lithium salt other than the lithium imide salt is LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , and LiCH 3 SO 3 may be at least one selected from the group consisting of.
- LiFSI Lithium bis(fluorosulf
- the molar ratio of the lithium imide salt to a lithium salt other than the lithium imide salt may be 1:1 to 7:1, preferably 1:1 to 6:1, more preferably It may be 1:1 to 4:1.
- the non-aqueous electrolyte for a lithium secondary battery of the present invention may include an organic solvent, and the organic solvent is a solvent commonly used in lithium secondary batteries, for example, ether compounds, esters (Acetates, Propionates) compounds, and amides.
- a compound, a linear carbonate, or a cyclic carbonate compound may be used alone or in combination of two or more.
- a mixture of linear carbonates and cyclic carbonates may be preferably used as the organic solvent.
- the organic solvent when a mixture of a linear carbonate and a cyclic carbonate is used, dissociation and movement of the lithium salt can be facilitated.
- the cyclic carbonate-based compound and the linear carbonate-based compound are mixed in a volume ratio of 1:9 to 6:4, preferably 1:9 to 4:6 by volume, more preferably 2:8 to 4:6 by volume.
- the linear carbonate compound is specific examples of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), ethylmethyl carbonate (EMC), methylpropyl carbonate (MPC) and ethylpropyl carbonate (EPC)
- DMC dimethyl carbonate
- DEC diethyl carbonate
- DPC dipropyl carbonate
- EMC ethylmethyl carbonate
- MPC methylpropyl carbonate
- EPC ethylpropyl carbonate
- EPC ethylpropyl carbonate
- cyclic carbonate compound is, for example, ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3- one compound selected from the group consisting of pentylene carbonate, vinylene carbonate, and halides thereof, or a mixture of at least two or more thereof.
- EC ethylene carbonate
- PC propylene carbonate
- 2,3-butylene carbonate 1,2-pentylene carbonate
- the lithium secondary battery of the present invention may have an operating voltage of 4.0V or higher, preferably an operating voltage of 4.2V or higher, and more preferably, an operating voltage of 4.25V or higher.
- the operating voltage of the lithium secondary battery is less than 4.0V, the difference according to the addition of the pyridine-based additive of the present invention is not large, but in the lithium secondary battery having an operating voltage of 4.0V or more, high temperature storage and lifespan characteristics according to the addition of the additive This shows a rapidly increasing effect.
- the lithium secondary battery of the present invention includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte for a lithium secondary battery. More specifically, it includes at least one or more positive electrodes, at least one negative electrode, a separator selectively interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte for the lithium secondary battery. At this time, since the non-aqueous electrolyte solution for a lithium secondary battery is the same as the above-described content, a detailed description thereof will be omitted.
- the positive electrode may be prepared by coating a positive electrode active material slurry including a positive electrode active material, an electrode binder, an electrode conductive material and a solvent on a positive electrode current collector.
- the positive electrode current collector is not particularly limited as long as it has conductivity without causing a chemical change in the battery.
- stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon on the surface of aluminum or stainless steel. , nickel, titanium, silver, etc. may be used.
- the positive electrode current collector may form fine irregularities on the surface to strengthen the bonding force of the positive electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, a nonwoven body.
- the positive active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include a lithium composite metal oxide including lithium and one or more metals such as cobalt, manganese, nickel or aluminum.
- the lithium composite metal oxide is a lithium-manganese oxide (eg, LiMnO 2 , LiMn 2 O 4 , etc.), a lithium-cobalt-based oxide (eg, LiCoO 2 , etc.), lithium-nickel-based oxide (eg, LiNiO 2 , etc.), lithium-nickel-manganese oxide (eg, LiNi 1-Y1 Mn Y1 O 2 (here, 0 ⁇ Y1 ⁇ 1), LiMn 2-z1 Ni z1 O 4 ( Here, 0 ⁇ Z1 ⁇ 2, etc.), lithium-nickel-cobalt-based oxides (eg, LiNi 1-Y2 Co Y2 O 2 (here, 0 ⁇ Y2 ⁇ 1), etc.), lithium
- the lithium composite metal oxide is LiCoO 2 , LiMnO 2 , LiNiO 2 , lithium nickel manganese cobalt oxide (for example, Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 ,Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2 , or Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 , etc.), or lithium nickel cobalt aluminum oxide (eg, LiNi 0.8 Co 0.15 Al 0.05 O 2 , etc.), etc.
- the lithium composite metal oxide is Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 ,Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 , or Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 , and the like, and any one or a mixture of two or more thereof may be used.
- the binder for the electrode is a component that assists in bonding the positive electrode active material and the electrode conductive material and the like to the current collector.
- polyvinylidene fluoride polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, polyethylene (PE) , polypropylene, ethylene-propylene-dienter polymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, and various copolymers.
- the electrode conductive material is a component for further improving the conductivity of the positive electrode active material.
- the electrode conductive material is not particularly limited as long as it has conductivity without causing a chemical change in the battery.
- graphite carbon-based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermal black
- conductive fibers such as carbon fibers and metal fibers
- metal powders such as carbon fluoride, aluminum, and nickel powder
- conductive whiskeys such as zinc oxide and potassium titanate
- conductive metal oxides such as titanium oxide
- Conductive materials such as polyphenylene derivatives may be used.
- acetylene black-based products such as Chevron Chemical Company, Denka Singapore Private Limited, Gulf Oil Company, etc.
- Ketjenblack EC series (products of the Armak Company)
- Vulcan XC-72 products of the Cabot Company
- Super P products of the Timcal Company
- the solvent may include an organic solvent such as N-methyl-2-pyrrolidone (NMP), and may be used in an amount having a desirable viscosity when including the positive electrode active material, and optionally a positive electrode binder and positive electrode conductive material. there is.
- NMP N-methyl-2-pyrrolidone
- the negative electrode may be prepared by coating a negative electrode active material slurry including a negative electrode active material, an electrode binder, an electrode conductive material and a solvent on a negative electrode current collector. Meanwhile, the negative electrode may use a metal negative electrode current collector itself as an electrode.
- the negative electrode current collector is not particularly limited as long as it has high conductivity without causing a chemical change in the battery, and for example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel. A surface treated with carbon, nickel, titanium, silver, etc., an aluminum-cadmium alloy, etc. may be used on the surface.
- the bonding strength of the negative electrode active material may be strengthened by forming fine irregularities on the surface, and may be used in various forms such as a film, sheet, foil, net, porous body, foam, non-woven body, and the like.
- Examples of the negative active material include natural graphite, artificial graphite, carbonaceous material; lithium-containing titanium composite oxide (LTO), Si, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe metals (Me); alloys composed of the metals (Me); oxides (MeOx) of the metals (Me); and at least one negative electrode active material selected from the group consisting of a composite of the metal (Me) and carbon.
- a conventional porous polymer film conventionally used as a separator for example, an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate copolymer such as a polyolefin-based film.
- a porous polymer film made of a polymer may be used alone or by laminating them, or a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high-melting glass fiber, polyethylene terephthalate fiber, etc. may be used, but is limited thereto not.
- Ethylene carbonate (EC):ethylmethyl carbonate (EMC) was mixed in a volume ratio of 30:70, and then dissolved so that the concentration of LiPF 6 (lithium hexafluorophosphate) was 1.0M to prepare a non-aqueous organic solvent, followed by LiN (FSO 2 ) 2 (lithium bisfluorosulfonylimide, LiFSI) was added to make 0.3 wt%.
- LiPF 6 lithium hexafluorophosphate
- LiN (FSO 2 ) 2 lithium bisfluorosulfonylimide, LiFSI
- a cathode active material LiNi 0.6 Co 0.6 Mn 0.2 O 2 ; NCM622
- carbon black as a conductive material
- PVDF polyvinylidene fluoride
- NMP Methyl-2-pyrrolidone
- a negative electrode active material slurry After mixing graphite as an anode active material, polyvinylidene difluoride (PVDF) as a binder, and carbon black as a conductive material in a 95:2:3 weight ratio, N-methyl-2-pyrrolidone (NMP) as a solvent ) to prepare a negative electrode active material slurry.
- the negative electrode active material slurry was applied to a 10 ⁇ m-thick copper (Cu) thin film as a negative electrode current collector, dried to prepare a negative electrode, and then roll press was performed to prepare a negative electrode.
- the positive electrode, the negative electrode, and the separator made of polypropylene/polyethylene/polypropylene (PP/PE/PP) were laminated in the order of the positive electrode/separator/negative electrode, and the laminated structure was placed in a pouch-type battery case and then a non-aqueous lithium secondary battery A lithium secondary battery was prepared by injecting an electrolyte.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 3 g of the lithium salt represented by Formula A as an additive was added to 97 g of the non-aqueous organic solvent.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of the lithium salt represented by the following formula B was added instead of 1 g of the lithium salt represented by the formula A as an additive.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of the lithium salt represented by the following formula (C) was added instead of 1 g of the lithium salt represented by the formula (A) as an additive.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of the lithium salt represented by the following formula (D) was added instead of 1 g of the lithium salt represented by the formula (A) as an additive.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that the lithium salt represented by Formula A was not used as an additive when preparing the electrolyte for a lithium secondary battery.
- a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 15 g of the lithium salt represented by Formula A was added as an additive.
- a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of 1,3-propanesultone was added instead of 1 g of the lithium salt represented by Formula A as an additive.
- a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of ethylene sulfate was added instead of 1 g of the lithium salt represented by Formula A as an additive.
- a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery were prepared in the same manner as in Example 1, except that 1 g of the following comparative compound a was added instead of 1 g of the lithium salt represented by Formula A as an additive.
- Example 1 Formula A One Example 2 Formula A 3 Example 3 Formula B One Example 4 Formula C One Example 5 Formula D One Comparative Example 1 - 0 Comparative Example 2 Formula A 15 Comparative Example 3 1,3-propanesultone One Comparative Example 4 ethylene sulfate One Comparative Example 5 comparative compound a One
- the lithium secondary batteries of Examples 1 to 5 and Comparative Examples 1 to 5 were charged at room temperature under 0.33C/4.25V constant current/constant voltage (CC/CV) conditions to 4.25V/0.05C mA, and at 0.33C constant current (CC) conditions.
- the initial discharge capacity was measured by discharging to 3V.
- Capacity retention rate (%) Final discharge capacity (mAh) / Initial discharge capacity (mAh)
- Resistance increase rate (%) ⁇ (final resistance-initial resistance)/ initial resistance ⁇ 100(%)
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Abstract
Description
| 첨가제 종류 | 첨가제 함량(중량%) | |
| 실시예 1 | 화학식 A | 1 |
| 실시예 2 | 화학식 A | 3 |
| 실시예 3 | 화학식 B | 1 |
| 실시예 4 | 화학식 C | 1 |
| 실시예 5 | 화학식 D | 1 |
| 비교예 1 | - | 0 |
| 비교예 2 | 화학식 A | 15 |
| 비교예 3 | 1,3-프로판설톤 | 1 |
| 비교예 4 | 에틸렌설페이트 | 1 |
| 비교예 5 | 비교 화합물 a | 1 |
| 초기 방전 용량(mAh) | 최종 방전 용량(mAh) | 용량 유지율(%) | |
| 실시예 1 | 2108.6 | 1939.912 | 92.0% |
| 실시예 2 | 2105 | 1926.075 | 91.5% |
| 실시예 3 | 2103.8 | 1920.769 | 91.3% |
| 실시예 4 | 2100.9 | 1911.819 | 91.0% |
| 실시예 5 | 2098 | 1898.69 | 90.5% |
| 비교예 1 | 2091.3 | 1863.348 | 89.1% |
| 비교예 2 | 2085.8 | 1827.161 | 87.6% |
| 비교예 3 | 2083.3 | 1779.138 | 85.4% |
| 비교예 4 | 2079.9 | 1769.995 | 85.1% |
| 비교예 5 | 2050.6 | 1714.302 | 83.6% |
| 저항 증가율(%) | |
| 실시예 1 | 8.3 |
| 실시예 2 | 8.7 |
| 실시예 3 | 8.9 |
| 실시예 4 | 9.5 |
| 실시예 5 | 10.8 |
| 비교예 1 | 15.9 |
| 비교예 2 | 17.9 |
| 비교예 3 | 19.0 |
| 비교예 4 | 20.4 |
| 비교예 5 | 20.8 |
Claims (10)
- 전해질염, 유기 용매 및 첨가제를 포함하는 리튬 이차전지용 비수계 전해액으로서,상기 첨가제는 설폰이미드기 및 프로판설톤기 또는 에틸렌설페이트기를 갖는 음이온을 포함하는 리튬염인 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제2항에 있어서,상기 R이 F 또는 CF3인 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제1항에 있어서,상기 첨가제가 전체 중량에 대하여 0.01중량% 내지 10중량%를 포함되는 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제1항에 있어서,상기 전해질염이 LiCl, LiBr, LiI, LiBF4, LiClO4, LiB10Cl10, LiAlCl4, LiAlO4, LiPF6, LiCF3SO3, LiCH3CO2, LiCF3CO2, LiAsF6, LiSbF6, LiCH3SO3, LiFSI(Lithium bis(fluorosulfonyl)imide, LiN(SO2F)2), LiBETI(lithium bisperfluoroethanesulfonimide, LiN(SO2CF2CF3)2 및 LiTFSI(lithium (bis)trifluoromethanesulfonimide, LiN(SO2CF3)2)로 이루어진 군으로부터 선택된 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제1항에 있어서,상기 전해질염의 농도가 0.1M 내지 3M인 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제1항에 있어서,상기 유기 용매가 에테르, 에스테르, 아미드, 선형 카보네이트, 환형 카보네이트로 이루어진 군으로부터 선택된 1종 이상을 포함하는 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 제1항에 있어서,상기 리튬 이차전지가 4.0V 이상의 작동 전압을 갖는 것을 특징으로 하는 리튬 이차전지용 비수계 전해액.
- 양극, 음극, 상기 양극과 음극 사이에 게재되는 분리막 및 제1항 내지 제9항에 따른 리튬 이차전지용 비수계 전해액을 포함하는 리튬 이차전지.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21889410.3A EP4170772B1 (en) | 2020-11-03 | 2021-10-14 | Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same |
| PL21889410.3T PL4170772T3 (pl) | 2020-11-03 | 2021-10-14 | Niewodny elektrolit dla litowej baterii akumulatorowej i zawierająca go litowa bateria akumulatorowa |
| ES21889410T ES2991381T3 (es) | 2020-11-03 | 2021-10-14 | Electrolito no acuoso para batería secundaria de litio, y batería secundaria de litio que comprende el mismo |
| CN202180049047.5A CN115812259A (zh) | 2020-11-03 | 2021-10-14 | 锂二次电池用非水电解液及包含其的锂二次电池 |
| US18/005,783 US12531272B2 (en) | 2020-11-03 | 2021-10-14 | Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same |
| JP2023501302A JP7484009B2 (ja) | 2020-11-03 | 2021-10-14 | リチウム二次電池用非水系電解液及びこれを含むリチウム二次電池 |
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| KR1020200144943A KR102680034B1 (ko) | 2020-11-03 | 2020-11-03 | 리튬 이차전지용 비수계 전해액 및 이를 포함하는 리튬 이차전지 |
| KR10-2020-0144943 | 2020-11-03 |
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| US (1) | US12531272B2 (ko) |
| EP (1) | EP4170772B1 (ko) |
| JP (1) | JP7484009B2 (ko) |
| KR (1) | KR102680034B1 (ko) |
| CN (1) | CN115812259A (ko) |
| ES (1) | ES2991381T3 (ko) |
| HU (1) | HUE068632T2 (ko) |
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| WO (1) | WO2022097945A1 (ko) |
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| Publication number | Publication date |
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| JP7484009B2 (ja) | 2024-05-15 |
| KR102680034B1 (ko) | 2024-06-28 |
| PL4170772T3 (pl) | 2024-12-02 |
| EP4170772A1 (en) | 2023-04-26 |
| ES2991381T3 (es) | 2024-12-03 |
| US12531272B2 (en) | 2026-01-20 |
| US20230344003A1 (en) | 2023-10-26 |
| EP4170772A4 (en) | 2024-05-01 |
| CN115812259A (zh) | 2023-03-17 |
| HUE068632T2 (hu) | 2025-01-28 |
| JP2023533050A (ja) | 2023-08-01 |
| KR20220059607A (ko) | 2022-05-10 |
| EP4170772B1 (en) | 2024-09-25 |
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