WO2024146548A1 - 聚合物及其制备方法、隔离膜、极片、电池及用电装置 - Google Patents
聚合物及其制备方法、隔离膜、极片、电池及用电装置 Download PDFInfo
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- C08F212/02—Monomers containing only one unsaturated aliphatic radical
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- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
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- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
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Definitions
- the present application belongs to the field of batteries, and specifically relates to a polymer and a preparation method thereof, an isolation membrane, an electrode, a battery and an electrical device.
- the present application provides a polymer, aiming to enhance the adhesion of battery adhesives, thereby improving the dynamic performance and safety performance of batteries containing the polymer.
- R 3 includes a hydrogen atom or an alkyl group of 1 to 6 carbon atoms.
- a highly polar cyano group can be contained in the polymer, which helps to improve the ionic conductivity of the polymer, thereby improving the kinetic performance of the battery.
- the inorganic substance includes at least one of silicon oxide, aluminum oxide, calcium oxide, zinc oxide, magnesium oxide, sodium sulfate, sodium benzoate, calcium carbonate and modified materials thereof, and the inorganic substance may include at least one of silicon dioxide, aluminum oxide, zinc oxide, magnesium oxide or sodium benzoate, and more optionally, the inorganic substance may include at least one of fumed silica, silicon powder, aluminum oxide or sodium benzoate.
- the inorganic substance includes silicon dioxide, and the particle size of the silicon dioxide is 2nm-1 ⁇ m, optionally 5nm-100nm, and more optionally 5nm-20nm.
- the particle size of the silicon dioxide is 2nm-1 ⁇ m, optionally 5nm-100nm, and more optionally 5nm-20nm.
- the sixth aspect of the present application provides an electric device, wherein the electric device comprises the above-mentioned battery, so that the electric device has excellent dynamic performance and safety performance.
- FIG. 4 is a schematic diagram of a battery pack according to an embodiment of the present application.
- FIG. 5 is an exploded view of the battery pack shown in FIG. 4 according to an embodiment of the present application.
- FIG. 6 is a schematic diagram of an electrical device using a battery as a power source according to an embodiment of the present application.
- “Scope” disclosed in the present application is limited in the form of lower limit and upper limit, and a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a special range.
- the scope limited in this way can be including end values or not including end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a scope. For example, if the scope of 60-120 and 80-110 is listed for a specific parameter, it is understood that the scope of 60-110 and 80-120 is also expected.
- the numerical range "a-b" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers.
- the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations.
- a parameter is expressed as an integer ⁇ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.
- the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially.
- the method may further include step (c), which means that step (c) may be added to the method in any order.
- the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.
- the “include” and “comprising” mentioned in this application represent open-ended or closed-ended expressions.
- the “include” and “comprising” may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.
- the term "or” is inclusive.
- the phrase “A or B” means “A, B, or both A and B”. More specifically, any of the following conditions satisfies the condition "A or B”: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).
- Polyester polymers are usually suitable for non-fluorine-containing polymer coated isolation membranes, but existing polyester polymers have poor adaptability to battery cell manufacturing processes. For example, small particle size emulsions or suspensions have the problem of pore plugging. Polyester powders with large particle size and high glass transition temperature have problems with poor hot pressing and increased battery internal resistance.
- the polymer disclosed in the embodiments of the present application is suitable for batteries, and the batteries disclosed in the embodiments of the present application can be used in electrical equipment that uses batteries as power sources or various energy storage systems that use batteries as energy storage elements.
- Electrical equipment may include, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, and the like.
- electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like
- spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.
- the present application provides a polymer, wherein the polymer comprises an organic polymer and an inorganic substance, wherein the polymerization monomer of the organic polymer comprises a first monomer and a second monomer,
- R1 includes a hydrogen atom or an alkyl group of 1 to 6 carbon atoms
- R2 includes a hydrogen atom, a substituted or unsubstituted alkyl group of 1 to 21 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, or a substituted or unsubstituted isobornyl group, wherein the substituent in the substituted alkyl group of 1 to 21 carbon atoms includes a hydroxyl group
- the second monomer contains an alkenyl group.
- the polymers of the present application include organic polymers and inorganic substances, wherein the organic polymers are prepared by The first monomer and the second monomer containing an olefinic group are polymerized to obtain the unsaturated ester group in the first monomer, which can improve the anti-swelling ability of the polymer, and as a flexible monomer segment in the molecular segment, it can adjust the glass transition temperature of the organic polymer, improve the toughness of the polymer when applied, and help to play a good bonding role; the second monomer contains an olefinic group, which is polymerized with the first monomer to obtain an organic polymer with good bonding properties.
- the present application combines the organic polymer obtained by polymerizing the first monomer and the second monomer with an inorganic substance to make the polymer have good bonding properties and also have a suitable glass transition temperature, which is suitable for giving full play to its bonding properties under battery operating conditions. And the combination of organic polymers and inorganic substances can improve the ionic conductivity and electrolyte resistance of the polymer, thereby improving the dynamic performance and safety performance of the battery containing it.
- the structural formula of the first monomer includes:
- R1 includes hydrogen atom or alkyl group of 1-6 carbon atoms
- R2 includes hydrogen atom, substituted or unsubstituted alkyl group of 1-21 carbon atoms, cycloalkyl group of 3-6 carbon atoms, substituted or unsubstituted isobornyl group
- the substituent in the substituted alkyl group of 1-21 carbon atoms includes hydroxyl group.
- the unsaturated ester group in the first monomer can improve the anti-swelling ability of the polymer, and as a flexible monomer segment in the molecular segment, it can adjust the glass transition temperature of the organic polymer, improve the toughness of the polymer when applied, and help to play a good bonding effect.
- an alkyl group with 1-6 carbon atoms can be understood as an alkyl group with 1-6 carbon atoms, such as methyl (-CH 3 ), ethyl (-CH 2 CH 3 ), n-propyl (-CH 2 CH 2 CH 3 ), isopropyl (-CH(CH 3 ) 2 ), n-butyl (-CH 2 CH 2 CH 2 CH 3 ), tert-butyl (-C(CH 3 ) 3 ), n-pentyl (-CH 2 CH 2 CH 2 CH 2 CH 3 ), n-hexyl (-CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 ), and the like.
- a substituted or unsubstituted alkyl group with 1-21 carbon atoms wherein the substituted alkyl group with 1-21 carbon atoms can be understood as a group in which at least one hydrogen atom on the alkyl group with 1-21 carbon atoms is replaced by other groups, such as -CH 2 OH, -CH 2 CH 2 OH, -CH 2 CH 2 CH 2 OH, -CH(CH 2 OH) 2 , -CH 2 CH 2 CH 2 CH 2 OH, -C(CH 2 OH) 3 , -CH 2 CH 2 CH 2 CH 2 CH 2 OH , etc.;
- the unsubstituted alkyl group with 1-21 carbon atoms can be understood as a group in which at least one hydrogen atom on the alkyl group with 1-21 carbon atoms is replaced by other groups.
- alkyl groups such as methyl (-CH 3 ), ethyl (-CH 2 CH 3 ), n-propyl (-CH 2 CH 2 CH 3 ), isopropyl (-CH(CH 3 ) 2 ), n-butyl (-CH 2 CH 2 CH 2 CH 3 ), tert-butyl (-C(CH 3 ) 3 ), n-pentyl (-CH 2 CH 2 CH 2 CH 2 CH 3 ), n-hexyl (-CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 ) and the like; cycloalkyl groups having 3-6 carbon atoms, which can be understood as cycloalkyl groups having 3-6 carbon atoms, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and the like.
- the glass transition temperature of the organic polymer can be adjusted, the toughness of the polymer when applied can be improved, and a good bonding effect can be exerted.
- the first monomer includes at least one of methyl methacrylate, lauryl acrylate, lauryl methacrylate, or trimethylolpropane triacrylate.
- the second monomer contains an alkenyl group.
- the second monomer contains an alkenyl group, and the organic polymer obtained by polymerizing the second monomer with the first monomer has good bonding properties and a low glass transition temperature.
- the structural formula of the second monomer includes:
- R 6 , R 7 , R 8 and R 9 each independently include a hydrogen atom, a substituted or unsubstituted phenyl group, a substituted or unsubstituted cycloalkyl group, or a linear or branched alkyl group.
- substituted phenyl group can be understood as a phenyl group in which at least one hydrogen on the phenyl group is replaced by other groups, such as benzyl, phenethyl, etc.
- substituted cycloalkyl group can be understood as a group in which at least one hydrogen on the cycloalkyl group is replaced by other groups, such as cyclopropylmethyl, cyclobutylmethyl, etc.
- the polymer containing it has good bonding properties and also has a suitable glass transition temperature, so that it is suitable for giving full play to its bonding properties under battery conditions, thereby helping to improve the dynamic performance and safety performance of the secondary battery.
- the polymer when applied to the separator, it helps to reduce the resistance of the separator and improve the ionic conductivity of the separator, thereby improving the battery performance.
- the second monomer includes at least one of ethylene, styrene, butadiene or isoprene. Therefore, the second monomer uses at least one of the above organic substances, which can further play a role in regulating the molecular weight, improve the bonding performance of the organic polymer, and make the organic polymer have a suitable glass transition temperature.
- the weight ratio of the first monomer to the second monomer is 1:0.05-0.5, for example, 1:0.1-0.45, 1:0.15-0.4, 1:0.2-0.35, 1:0.25-0.3, etc.
- the organic polymer is prepared by using the first monomer and the second monomer in this mixing ratio, and the resulting polymer has good bonding properties and a suitable glass transition temperature, so that it is suitable for giving full play to its bonding properties under battery conditions, thereby helping to improve the dynamic performance and safety performance of the secondary battery.
- the polymer when the polymer is applied to an isolation membrane, it helps to reduce the resistance of the isolation membrane and improve the ionic conductivity of the isolation membrane, thereby improving the battery performance.
- the weight ratio of the first monomer to the second monomer is 1:0.1-0.2.
- the polymerized monomers of the organic polymer include a first monomer, a second monomer and a third monomer, and the third monomer includes an unsaturated nitrile group.
- a strongly polar cyano group can be introduced into the polymer, which helps to improve the ionic conductivity of the polymer, thereby improving the kinetic performance of the battery.
- the weight ratio of the first monomer to the second monomer and the third monomer is 1:0.05-0.5:0.01-0.8, for example, 1:0.1-0.45:0.01-0.8, 1:0.15-0.4:0.01-0.8, 1:0.2-0.35:0.01-0.8, 1:0.25-0.3:0.01-0.8, 1:0.05-0.5:0.05-0.75, 1:0.05-0.5:0.1-0.7, 1:0.05-0.5:0.15-0.65, 1:0.05-0.5:0.2-0.6, 1:0.05-0.5:0.3-0.5, 1:0.05-0.5:0.4-0.5, etc.
- the fourth monomer includes at least one of acrylamide, N-methylol acrylamide or N-butoxymethyl acrylamide.
- the molecular weight of the organic polymer can be adjusted and the adhesion of the polymer can be improved.
- the fourth monomer includes at least one of acrylamide or N-methylol acrylamide.
- the weight average molecular weight of the organic polymer can be measured by a method commonly used in the art, for example, by gel permeation chromatography according to GB/T 21863-2008.
- the inorganic material and the organic polymer can be fully mixed, thereby improving the ionic conductivity and electrolyte resistance of the isolation membrane containing the polymer.
- the particle size of the inorganic material is 0.01 ⁇ m-0.5 ⁇ m, and further the particle size of the inorganic material is 0.01 ⁇ m-0.2 ⁇ m.
- the isolation film described in the present application can be prepared by conventional methods in the art.
- the polymer described in the first aspect of the present application can be dissolved in an organic solvent to obtain a slurry, which is then coated on a base film and then dried to remove the organic solvent to obtain the isolation film described in the present application.
- lithium-containing phosphates with an olivine structure may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO 4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate or a composite material of lithium iron manganese phosphate and carbon.
- lithium iron phosphate such as LiFePO 4 (also referred to as LFP)
- LiMnPO 4 lithium manganese phosphate
- the positive electrode active material may be a positive electrode active material for a sodium ion battery known in the art.
- the positive electrode active material may include but is not limited to at least one of a layered transition metal oxide, a polyanion compound, and a Prussian blue analog.
- polyanionic compound examples include:
- M 5 comprises at least one of Mn, Fe, Co, Ni, Cu or Zn, 0 ⁇ p ⁇ 2, 0 ⁇ q ⁇ 2;
- the positive electrode active material layer may also optionally include other binders.
- the other binders may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, or fluorine-containing acrylate resin.
- PVDF polyvinylidene fluoride
- PTFE polytetrafluoroethylene
- PTFE polytetrafluoroethylene
- vinylidene fluoride-tetrafluoroethylene-propylene terpolymer vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer
- the positive electrode sheet can be prepared in the following manner: the components for preparing the positive electrode sheet, such as the positive electrode active material, the conductive agent, the polymer and any other components are dispersed in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; the positive electrode slurry is coated on the positive electrode collector, and after drying, cold pressing and other processes, the positive electrode sheet can be obtained.
- a solvent such as N-methylpyrrolidone
- the mass proportion of the polymer in the positive electrode sheet is 1%-3%, such as 1.2%-2.8%, 1.5%-2.5%, 1.8%-2.2%, 2%-2.2%, etc.
- the shedding of the positive electrode sheet can be reduced, thereby improving the kinetic performance of the battery containing it.
- the electrode sheet described in the present application may also be a negative electrode sheet.
- the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, and the negative electrode active material layer includes the polymer described in the first aspect of the present application or a polymer obtained by the method described in the second aspect of the present application. Specifically, the polymer can be used as a binder in the negative electrode active material layer.
- the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material layer is disposed on either or both of the two facing surfaces of the negative electrode current collector.
- the negative electrode current collector may be a metal foil or a composite current collector.
- the metal foil copper foil may be used.
- the composite current collector may include a polymer material base layer and a The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).
- PP polypropylene
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- PS polystyrene
- PE polyethylene
- the negative electrode active material may adopt the negative electrode active material for the battery known in the art.
- the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc.
- the silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites or silicon alloys.
- the tin-based material may include at least one of elemental tin, tin oxide compounds or tin alloys.
- the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries can also be used. These negative electrode active materials can be used alone or in combination of two or more.
- the negative electrode active material layer may further include a conductive agent, which may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, or carbon nanofibers.
- a conductive agent which may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, or carbon nanofibers.
- the negative electrode active material layer may further optionally include other binders.
- the other binders may be selected from at least one of styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA) or carboxymethyl chitosan (CMCS).
- the negative electrode active material layer may further optionally include other additives, such as a thickener (such as sodium carboxymethyl cellulose (CMC-Na)).
- a thickener such as sodium carboxymethyl cellulose (CMC-Na)
- the negative electrode sheet can be prepared in the following manner: the above-mentioned components for preparing the negative electrode sheet, such as the negative electrode active material, the conductive agent, the polymer and other optional components are dispersed in a solvent (such as deionized water) to form a negative electrode slurry; the negative electrode slurry is coated on the negative electrode collector, and after drying, cold pressing and other processes, the negative electrode sheet can be obtained.
- a solvent such as deionized water
- the fifth aspect of the present application provides a battery, wherein the battery comprises the isolation membrane of the third aspect and/or the pole piece of the fourth aspect, so that the battery has excellent dynamic performance and safety performance.
- the battery cell may include an outer packaging, which may be used to encapsulate the electrode assembly and the electrolyte.
- the outer packaging of the battery cell may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc.
- the outer packaging of the battery cell may also be a soft package, such as a bag-type soft package.
- the material of the soft package may be plastic, and examples of the plastic include polypropylene, polybutylene terephthalate, and polybutylene succinate.
- FIG1 is a battery cell 1 of a square structure as an example.
- battery cells may be assembled into a battery module.
- the number of battery cells contained in the battery module may be one or more, and the specific number may be selected by those skilled in the art according to the application and capacity of the battery module.
- the battery module 2 may further include a housing having a receiving space, and the plurality of battery cells 1 are received in the receiving space.
- the battery modules described above may also be assembled into a battery pack.
- the battery pack may contain one or more battery modules, and the specific number may be selected by those skilled in the art according to the application and capacity of the battery pack.
- FIG4 and FIG5 are battery packs 3 as an example.
- the battery pack 1 may include a battery box and a plurality of battery modules 2 disposed in the battery box.
- the battery box includes an upper box body 31 and a lower box body 32, and the upper box body 31 can be covered on the lower box body 32 to form a closed space for accommodating the battery modules 2.
- the plurality of battery modules 2 can be arranged in the battery box in any manner.
- the present application also provides an electrical device, which includes the battery provided in the present application.
- the battery cell, battery module, or battery pack can be used as a power source for the electrical device, and can also be used as an energy storage unit for the electrical device.
- the electrical device may include mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but are not limited thereto.
- a battery cell, a battery module or a battery pack may be selected according to its usage requirements.
- Fig. 6 is an example of an electric device.
- the electric device is a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, etc.
- a battery pack or a battery module may be used.
- a device may be a mobile phone, a tablet computer, a notebook computer, etc. Such a device is usually required to be light and thin, and a battery cell may be used as a power source.
- the required monomers are stirred and mixed in a proportion of 25wt% of methyl methacrylate, 55wt% of n-butyl acrylate, 2wt% of acrylic acid, 3wt% of hydroxyethyl acrylate, 5wt% of trimethylolpropane triacrylate and 10wt% of styrene.
- the required monomers were stirred and mixed evenly according to the weight percentage of methyl methacrylate 25wt%, n-butyl acrylate 48wt%, acrylic acid 2wt%, hydroxyethyl acrylate 3wt%, trimethylolpropane triacrylate 5wt%, and styrene 17wt%.
- 1000g of mixed monomers, 30g of sodium dodecyl sulfate emulsifier, 10g of ammonium persulfate initiator, and 1200g of deionized water were added to a 5000mL four-necked flask equipped with a mechanical stirrer, a thermometer, and a condenser, and emulsified at high speed for 30min. Under nitrogen protection, the temperature was raised to 75°C for reaction for 4h, the pH was adjusted to 6-8, and the temperature was lowered to below 40°C to obtain an organic polymer 3.
- the polymer 3 is dispersed in water to obtain slurry, and then the slurry is coated on a base film (PE base film), and then water is removed by dry weight to obtain a separator 3.
- a base film PE base film
- the polymer 4 is dispersed in water to obtain slurry, and then the slurry is coated on a base film (PE base film), and then the water is removed by dry weight to obtain the isolation film 4.
- a base film PE base film
- the required monomers are stirred and mixed uniformly according to the weight percentage of methyl methacrylate 28.5wt%, n-butyl acrylate 56.5wt%, acrylic acid 2wt%, hydroxyethyl acrylate 3wt%, trimethylolpropane triacrylate 5wt%, styrene 4wt%, and acrylonitrile 1wt%.
- the required monomers are stirred and mixed uniformly according to the weight percentage of methyl methacrylate 15wt%, n-butyl acrylate 45wt%, acrylic acid 2wt%, hydroxyethyl acrylate 3wt%, trimethylolpropane triacrylate 5wt%, styrene 10wt%, and acrylonitrile 20wt%.
- the polymer 7 is dispersed in water to obtain slurry, and then the slurry is coated on a base film (PE base film), and then the water is removed by dry weight to obtain the isolation film 7.
- a base film PE base film
- the polymer 17 is dispersed in water to obtain slurry, and then the slurry is coated on a base film (PE base film), and then the water is removed by dry weight to obtain the isolation film 17.
- a base film PE base film
- the polymer 11 is dispersed in water to obtain a slurry, and then the slurry is coated on a base film (PE base film). After that, the water is removed by drying to obtain the isolation film 21.
- the polymer 23 is dispersed in water to obtain slurry, and then the slurry is coated on a base film (PE base film), and then the water is removed by dry weight to obtain the isolation film 24.
- a base film PE base film
- the required monomers were stirred and mixed evenly according to the weight percentage of methyl methacrylate 15wt%, butyl acrylate 78wt%, acrylic acid 2wt%, trimethylolpropane triacrylate 5wt%.
- 1000g of mixed monomers, 30g of sodium dodecyl sulfate emulsifier, 10g of ammonium persulfate initiator, 1200g of deionized water were added to a 5000mL four-necked flask equipped with a mechanical stirrer, a thermometer and a condenser, and emulsified at high speed for 30min. Under nitrogen protection, the temperature was raised to 75°C for reaction for 4h, the pH was adjusted to 6-8, and the temperature was lowered to below 40°C to obtain an organic polymer 25.
- the polyvinylidene fluoride binder is fully dissolved in N-methylpyrrolidone, and carbon black conductive agent and positive electrode active material LiNi 0.7 Co 0.2 Mn 0.1 O 2 are added to prepare a uniformly dispersed positive electrode slurry (the mass ratio of polyvinylidene fluoride binder, carbon black conductive agent and positive electrode active material is 3:2:95).
- the positive electrode slurry is evenly coated on the upper and lower surfaces of the aluminum foil, and then transferred to a vacuum drying oven for complete drying. The obtained electrode sheet is rolled and then punched to obtain the positive electrode sheet.
- the carbon nanotube material and the binder sodium carboxymethyl cellulose are added to water in a mass ratio of 4:1.6 and stirred to form a uniform negative electrode slurry.
- the negative electrode slurry is coated on the upper and lower surfaces of the copper foil, and then transferred to a vacuum drying oven for complete drying, and then punched to obtain a negative electrode sheet.
- sodium salt lithium hexafluorophosphate NaPF 6 was dissolved in an organic solvent ethylene glycol dimethyl ether DME and stirred evenly to obtain an electrolyte with a lithium salt concentration of 1 mol/L.
- isolation films prepared in the above examples and comparative examples were used as isolation films.
- the positive electrode sheet, the separator, and the negative electrode sheet are stacked in order, so that the separator is in the middle of the positive and negative electrode sheets to isolate the positive and negative electrodes, and the bare battery cell is wound and welded.
- the tabs are placed in the outer packaging, and the prepared electrolyte is injected into the dried battery cell.
- the lithium-ion battery is prepared by packaging, standing, forming, shaping, and capacity testing.
- the cycle capacity retention rate of lithium-ion batteries is determined by the following method:
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Abstract
Description
1电池单体;11壳体;12电极组件;13盖板;2电池模块;3电池包;31上箱体;32
下箱体。
δ=1000L/RA
δ=1000L/RA
Claims (30)
- 一种聚合物,其中,包括有机聚合物和无机物,所述有机聚合物的聚合单体包括第一单体和第二单体,所述第一单体的结构式包括:
其中,R1包括氢原子或1-6个碳原子的烷基,R2包括氢原子、取代或未取代的1-21个碳原子的烷基、3-6个碳原子的环烷基、取代或未取代的异冰片基,所述取代的1-21个碳原子的烷基中的取代基包括羟基,所述第二单体含有烯基。 - 根据权利要求1所述的聚合物,其中,所述第一单体与所述第二单体的重量比为1:0.05-0.5。
- 根据权利要求1或2所述的聚合物,其中,所述第一单体与所述第二单体的重量比1:0.1-0.2。
- 根据权利要求1-3中任一项所述的聚合物,其中,所述第一单体包括丙烯酸、甲基丙烯酸、丁烯酸、庚烯酸、衣康酸、马来酸、丙烯酸甲酯、丙烯酸乙酯、丙烯酸正丙酯、丙烯酸正丁酯、丙烯酸异丁酯、丙烯酸仲丁酯、丙烯酸叔丁酯、丙烯酸环己酯、丙烯酸月桂酯、丙烯酸-2-乙基己酯、丙烯酸-2-羟基乙酯、丙烯酸-2-羟基丙酯、甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸正丁酯、甲基丙烯酸-2-乙基己酯、甲基丙烯酸异冰片酯、甲基丙烯酸月桂酯、甲基丙烯酸-2-羟基乙酯、甲基丙烯酸-2-羟基丙酯、乙酸乙烯酯、甲基丙烯酸三氟乙酯、甲基丙烯酸缩水甘油酯、丙烯酸缩水甘油酯、甲基丙烯酸缩水甘油酯、乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯、甲基丙烯酸三甲胺乙酯或三羟甲基丙烷三丙烯酸酯中的至少一种,可选地,所述第一单体包括甲基丙烯酸甲酯、丙烯酸月桂酯、甲基丙烯酸月桂酯或三羟甲基丙烷三丙烯酸酯中的至少一种。
- 根据权利要求1-4中任一项所述的聚合物,其中,所述第二单体的结构式包括:
其中,R6、R7、R8、R9各自独立地包括氢原子、取代或未取代的苯基、取代或未取代 的环烷基、直链或支链的烷基。 - 根据权利要求1-5中任一项所述的聚合物,其中,所述第二单体包括乙烯、苯乙烯、丁二烯或异戊二烯中的至少一种。
- 根据权利要求1-6中任一项所述的聚合物,其中,所述有机聚合物的聚合单体包括第一单体、第二单体和第三单体,所述第三单体包括不饱和腈基。
- 根据权利要求7所述的聚合物,其中,所述第三单体的结构式为:
其中,R3包括氢原子或1-6个碳原子的烷基。 - 根据权利要求7或8所述的聚合物,其中,所述第三单体包括丙烯腈、甲基丙烯腈或乙基丙烯腈中的至少一种。
- 根据权利要求7-9中任一项所述的聚合物,其中,所述第一单体和所述第二单体、所述第三单体的重量比为1:0.05-0.5:0.01-0.8。
- 根据权利要求7-10中任一项所述的聚合物,其中,所述第一单体和所述第二单体、所述第三单体的重量比为1:0.1-0.2:0.05-0.6。
- 根据权利要求7-11中任一项所述的聚合物,其中,所述有机聚合物的聚合单体包括第一单体、第二单体、第三单体和第四单体,所述第四单体包括不饱和酰胺基。
- 根据权利要求12所述的聚合物,其中,所述第四单体的结构式包括:
其中,R4包括氢原子或1-6个碳原子的烷基,R5包括氢原子、羟基取代的1-6个碳原子的烷基或1-6个碳原子的烷氧基。 - 根据权利要求12或13所述的聚合物,其中,所述第四单体包括丙烯酰胺、N-羟甲基丙烯酰胺或N-丁氧基甲基丙烯酰胺中的至少一种。
- 根据权利要求12-14中任一项所述的聚合物,其中,所述第一单体、第二单体、第三单体和第四单体的重量比为1:0.05-0.5:0.01-0.8:0.05-0.7。
- 根据权利要求12-15中任一项所述的聚合物,其中,所述第一单体、第二单体、第三单体和第四单体的重量比为1:0.1-0.2:0.05-0.6:0.1-0.5。
- 根据权利要求1-16中任一项所述的聚合物,其中,满足以下条件中的至少之一:所述聚合物的粒径满足:3μm≤D50≤10μm;所述聚合物的粒径分布=(D90-D10)/D50,所述聚合物的粒径分布小于或等于2.5;所述无机物的粒径为0.0001μm-2μm。
- 根据权利要求1-17中任一项所述的聚合物,其中,所述无机物附着在所述有机聚合物的表面和/或分散在所述有机聚合物的内部。
- 根据权利要求1-18中任一项所述的聚合物,其中,所述无机物包括硅的氧化物、铝的氧化物、钙的氧化物、锌的氧化物、镁的氧化物、硫酸钠、苯甲酸钠、碳酸钙及其改性材料中的至少一种。
- 根据权利要求1-19中任一项所述的聚合物,其中,所述无机物包括二氧化硅,所述二氧化硅的粒径为2nm-1μm。
- 根据权利要求1-20中任一项所述的聚合物,其中,基于所述聚合物的质量,所述有机聚合物的质量占比为50%-99.9%。
- 根据权利要求1-21中任一项所述的聚合物,其中,所述聚合物的外表面呈凹凸不平。
- 根据权利要求1-22中任一项所述的聚合物,其中,所述聚合物在-10℃至95℃范围内包括第一玻璃化转变温度和第二玻璃化转变温度,所述第一玻璃化转变温度大于所述第二玻璃化转变温度。
- 根据权利要求23所述的聚合物,其中,所述聚合物的第一玻璃化转变温度为30℃-75℃;和/或,所述聚合物的第二玻璃化转变温度为-10℃至25℃。
- 一种制备聚合物的方法,其中,包括:将有机聚合物和无机物混合,其中所述有机聚合物的聚合单体包括第一单体和第二单体,所述第一单体的结构式包括:
其中,R1包括氢原子或1-6个碳原子的烷基,R2包括氢原子、取代或未取代的1-21个碳原子的烷基、3-6个碳原子的环烷基、取代或未取代的异冰片基,所述取代的1-21个碳原子的烷基中的取代基包括羟基,所述第二单体含有烯基。 - 一种隔离膜,包括权利要求1-24中任一项所述的聚合物或采用权利要求25所述方法得到的聚合物。
- 根据权利要求26所述的隔离膜,其中,所述隔离膜的离子电导率为0.3mS·cm-1-0.6mS·cm-1。
- 一种极片,包括权利要求1-24中任一项所述的聚合物或采用权利要求25所述方 法得到的聚合物。
- 一种电池,包括权利要求26或27所述的隔离膜和/或权利要求28的所述的极片。
- 一种用电装置,包括权利要求29所述的电池。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2025522730A JP2025537498A (ja) | 2023-01-04 | 2024-01-03 | ポリマー及びその調製方法、セパレータ、極板、電池並びに電気装置 |
| KR1020257010504A KR20250058759A (ko) | 2023-01-04 | 2024-01-03 | 폴리머 및 그의 제조 방법, 세퍼레이터, 극판, 전지 및 전기 장치 |
| EP24738481.1A EP4578912A4 (en) | 2023-01-04 | 2024-01-03 | POLYMER, ITS PREPARATION PROCESS, SEPARATOR, ELECTRODE SHEET, BATTERY AND ELECTRICAL APPLIANCE |
| US19/211,224 US20250277100A1 (en) | 2023-01-04 | 2025-05-18 | Polymer and preparation method thereof, separator, electrode plate, battery, and electrical device |
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Also Published As
| Publication number | Publication date |
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| CN118290645A (zh) | 2024-07-05 |
| US20240313225A1 (en) | 2024-09-19 |
| JP2025511417A (ja) | 2025-04-16 |
| WO2024146064A1 (zh) | 2024-07-11 |
| EP4578912A4 (en) | 2026-04-22 |
| US20250277100A1 (en) | 2025-09-04 |
| KR20240110739A (ko) | 2024-07-16 |
| EP4578912A1 (en) | 2025-07-02 |
| JP2025537498A (ja) | 2025-11-18 |
| EP4421143A1 (en) | 2024-08-28 |
| EP4421143A4 (en) | 2025-03-26 |
| KR20250058759A (ko) | 2025-04-30 |
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