CN117276808A - Polyolefin diaphragm, lithium ion battery and application - Google Patents
Polyolefin diaphragm, lithium ion battery and application Download PDFInfo
- Publication number
- CN117276808A CN117276808A CN202311338184.8A CN202311338184A CN117276808A CN 117276808 A CN117276808 A CN 117276808A CN 202311338184 A CN202311338184 A CN 202311338184A CN 117276808 A CN117276808 A CN 117276808A
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- CN
- China
- Prior art keywords
- polyolefin separator
- present application
- ceramic material
- coating
- polyolefin
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- Pending
Links
- 229920000098 polyolefin Polymers 0.000 title claims abstract description 48
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 21
- 239000002002 slurry Substances 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 13
- 229920006126 semicrystalline polymer Polymers 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000002861 polymer material Substances 0.000 claims abstract description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 17
- 229920001577 copolymer Polymers 0.000 claims description 14
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 239000002033 PVDF binder Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000011247 coating layer Substances 0.000 claims description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 229910001593 boehmite Inorganic materials 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 229920001519 homopolymer Polymers 0.000 claims description 3
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 229920006380 polyphenylene oxide Polymers 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 21
- 239000011148 porous material Substances 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 6
- 150000002500 ions Chemical class 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 description 21
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 15
- 239000010410 layer Substances 0.000 description 13
- 239000004698 Polyethylene Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 229920000573 polyethylene Polymers 0.000 description 12
- 239000012528 membrane Substances 0.000 description 10
- 238000001764 infiltration Methods 0.000 description 8
- 230000008595 infiltration Effects 0.000 description 8
- 239000002904 solvent Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- -1 vinyl halide Chemical class 0.000 description 7
- 210000004027 cell Anatomy 0.000 description 6
- 239000002131 composite material Substances 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 239000003292 glue Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 6
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000011267 electrode slurry Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 229960001701 chloroform Drugs 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- SCYULBFZEHDVBN-UHFFFAOYSA-N 1,1-Dichloroethane Chemical compound CC(Cl)Cl SCYULBFZEHDVBN-UHFFFAOYSA-N 0.000 description 1
- UHOPWFKONJYLCF-UHFFFAOYSA-N 2-(2-sulfanylethyl)isoindole-1,3-dione Chemical compound C1=CC=C2C(=O)N(CCS)C(=O)C2=C1 UHOPWFKONJYLCF-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003571 electronic cigarette Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- 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
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
- H01M50/434—Ceramics
-
- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The application discloses a polyolefin diaphragm, a lithium ion battery and application. The first aspect of the present application provides a polyolefin separator slurry, comprising the following raw materials: 20-50 parts by mass of polymer material and 10-20 parts by mass of ceramic material; the polymeric material comprises a semi-crystalline polymer; the ceramic material has a volume specific surface area of 10-50 sq.m/c. Combining a ceramic material with a semi-crystalline polymer capable of forming a three-dimensional interlocking pore size crystal framework of non-uniform size in the formed coating, wherein the crystalline portion and the amorphous portion form pores and provide adhesion, respectively, and the pores are utilized to provide ion permeation channels, so that the pores in the coating are connected with each other and can have good adhesion to the polar plate; the volume specific surface area of the ceramic material is selected to be of a size suitable for distribution in the pores of the crystal framework and not cause clogging. Finally, the separator has higher wettability to electrolyte by the combination of the two.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a polyolefin diaphragm, a lithium ion battery and application.
Background
With the shortage of fossil fuel resources and increasingly serious environmental and ecological problems, people are beginning to pursue cleaner, more environmentally friendly energy sources. Lithium ion batteries are receiving increasing attention due to their high energy density and high power density. Nowadays, lithium ion batteries are widely used in our daily lives, such as portable electronic products including notebook computers and mobile phones, and electric vehicles. However, these products put higher demands on the performance of lithium ion batteries, such as rapid charge and discharge, which requires higher rate capability of lithium batteries. It is well known that rate performance is related to various factors such as electrode materials, electrolytes, separators, and the like.
Among them, the separator, which is an important component in the lithium battery, can provide a lithium ion migration diffusion path in addition to preventing direct contact between the positive electrode and the negative electrode and securing safety. Conventional separators are coated with a ceramic coating on the surface to improve the safety thereof, but this often results in insufficient wettability of the separator to the electrolyte, and cannot realize high-rate circulation. Aiming at the problem, the wettability between the diaphragm and the electrolyte can directly influence the internal resistance of the battery and change the multiplying power performance of the battery. Moreover, the wettability of the two is also related to the deposition morphology of the negative electrode, thereby affecting the generation of lithium dendrites and the safety performance of the battery. In addition, the membrane has higher liquid retention rate due to the improvement of wettability, which is beneficial to prolonging the cycle life of the battery. Therefore, it is necessary to provide a separator having higher wettability to an electrolyte.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a polyolefin diaphragm with higher wettability to electrolyte, a lithium ion battery and application.
In a first aspect of the present application, there is provided a polyolefin separator slurry comprising the following raw materials: 20-50 parts by mass of polymer material and 10-20 parts by mass of ceramic material; the polymeric material comprises a semi-crystalline polymer; the ceramic material has a volume specific surface area of 10-50 sq.m/c.
The polyolefin separator slurry according to the first aspect of the present application has the following advantageous effects:
the diaphragm slurry combines ceramic materials with semi-crystalline polymers, the semi-crystalline polymers can form a three-dimensional interlocking aperture crystal framework with non-uniform size in a formed coating, the crystalline part and the amorphous part of the semi-crystalline polymers respectively play roles of forming pores and providing adhesion, and ion permeation channels are provided by the pores, so that the pores in the coating are connected with each other and can have good adhesion to the polar plates; while the volume specific surface area of the ceramic material is selected such that it is sized to fit within the pores of the crystal framework and does not cause clogging. Finally, the separator has higher wettability to electrolyte by the combination of the two.
In some embodiments of the present application, the semi-crystalline polymer is selected from at least one of polyvinylidene fluoride resin, polyamide, polyimide, polyacrylonitrile, polyethylene oxide, polyurethane, polyphenylene oxide, acrylate copolymer, polymethyl methacrylate. For the semi-crystalline polymers described above, the amorphous organic portion provides adhesion and the pores provide primarily ion permeation pathways. In addition, the polar groups contained in the crystalline fraction also further contribute to ion permeability, such as C-F in polyvinylidene fluoride-based polymers, C-N in polyacrylonitrile, etc.
In some embodiments of the present application, the polyvinylidene fluoride resin is a homopolymer, copolymer or mixture of vinylidene fluoride. Wherein the copolymer of vinylidene fluoride is a copolymer formed by vinylidene fluoride and at least one copolymerizable monomer; by a mixture is meant a mixture of a homopolymer of vinylidene fluoride and at least one copolymer, or a mixture of at least two copolymers.
In some embodiments of the present application, the copolymerizable monomer is a halogenated unsaturated hydrocarbon, such as at least one of a fluoroolefin, a chloroolefin; having at least one halogen atom therein. In some embodiments, the halo-unsaturated hydrocarbon is a vinyl halide, a propylene halide. Specifically, the copolymerizable monomer is at least one of tetrafluoroethylene, hexafluoropropylene, trifluoroethylene, trichloroethylene, and vinyl fluoride, for example.
In some embodiments of the present application, the polymeric material comprises polyvinylidene fluoride, vinylidene fluoride, and hexafluoropropylene copolymers.
In some embodiments of the present application, the mass percentage of polyvinylidene fluoride to vinylidene fluoride and hexafluoropropylene copolymer in the polymeric material is 8-15%, such as 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%.
In some embodiments of the present application, the polymeric material has a characteristic peak between 10 and 40 degrees. In some embodiments, the characteristic peak is a molecular chain spacing characteristic peak. In some embodiments, the feature is between 15 and 30 degrees. The polymer material meeting the above conditions has better crystallinity, so that a better crystal framework can be constructed, thereby promoting the infiltration of the electrolyte.
In some embodiments of the present application, the ceramic material is selected from at least one of silica, alumina, silica, calcia, magnesia, zinc oxide, titania, boehmite.
In some embodiments of the present application, the ceramic material is at least one of a zero-dimensional ceramic material, a one-dimensional ceramic material, a two-dimensional ceramic material, and a three-dimensional ceramic material.
In some embodiments of the present application, the ceramic material is at least one of ceramic fibers, ceramic nanoparticles.
In some embodiments of the present application, the ceramic material has a volume specific surface area of, for example, 10sq.m/c.c., 15sq.m/c.c., 20sq.m/c.c., 25sq.m/c.c., 30sq.m/c.c., 35sq.m/c.c., 40sq.m/c.c., 45sq.m/c.c., 50sq.m/c.c. The volume specific surface area of the ceramic material is too large, so that the ceramic material is difficult to disperse in the slurry, is unfavorable for the preparation of the slurry, and further affects the infiltration of the electrolyte on the diaphragm; the volume specific surface area of the ceramic material is too small, the particles of the ceramic material are larger, the holes are easy to be blocked, the electrolyte is not easy to diffuse in the diaphragm, the internal resistance is influenced, and the control of the thickness and the surface density of the coating is not facilitated; eventually causing a decrease in one or more of the properties of rate capability, safety capability, etc.
In some embodiments of the present application, the ceramic material has a volume specific surface area of 20 to 40sq.m/c.
In some embodiments of the present application, the mass ratio of the polymeric material to the ceramic material is (2-3): 1.
in some embodiments of the present application, the mass ratio of the polymeric material to the ceramic material is about 8:3.
in some embodiments of the present application, a solvent is also included in the polyolefin separator slurry.
In some embodiments of the present application, the solvent is an organic solvent.
In some embodiments of the present application, the solvent has a boiling point below 300 ℃.
In some embodiments of the present application, the solvent is selected from at least one of dimethylacetamide, dichloroethane, dimethylformamide, trichloroethane, trichloromethane, ethyl acetate, sulfolane, dimethylsulfoxide, N-methylpyrrolidone, chloroform, dichloromethane, acetone.
In a second aspect of the present application, there is provided a polyolefin separator having a surface provided with a coating layer formed of the foregoing polyolefin separator slurry.
In some embodiments of the present application, the first coating layer and the second coating layer are formed on opposite sides of the polyolefin separator, respectively, and the difference in thickness between the first coating layer and the second coating layer is not more than 20%, for example, the absolute value of the percentage of (thickness of the first coating layer-thickness of the second coating layer)/the thickness of the second coating layer is not more than 20%.
In some embodiments of the present application, the coating has a density of 0.5 to 2.5g/m 2 For example, it may be 0.5g/m 2 、1g/m 2 、1.5g/m 2 、2g/m 2 、2.5g/m 2 。
In some embodiments of the present application, the polyolefin separator comprises a single or multi-layer film of one or more materials of Polyethylene (PE), polypropylene (PP), polyvinylidene difluoride (PVDF).
In some embodiments of the present application, the polyolefin separator comprises a PE separator, a PP separator, a PE/PP/PE separator.
In some embodiments of the present application, the polyolefin separator has a melting point of 130 to 160 ℃.
In some embodiments of the present application, the polyolefin separator has a thickness of 3 to 20 μm.
In some embodiments of the present application, the polyolefin separator has a porosity of 20 to 50%.
In some embodiments of the present application, the polyolefin separator has a permeability of 30 to 400sec/100cc.
In some embodiments of the present application, the polyolefin separator is prepared as follows: preparing the polyolefin membrane slurry, and coating the polyolefin membrane slurry on the polyolefin membrane to form a coating.
In some embodiments of the present application, the polymer slurry and the ceramic slurry are formulated separately and mixed to provide a polyolefin separator slurry.
In some embodiments of the present application, the polyolefin separator slurry is coated onto a polyolefin separator and dried to form a coating.
In some embodiments of the present application, the manner in which the polyolefin separator slurry is applied to the polyolefin separator includes at least one of micro gravure coating, extrusion coating, dip coating, spray coating, spot coating, wire bar coating.
In a third aspect of the present application, a lithium ion battery is provided, comprising the polyolefin separator described above.
In some embodiments of the present application, a lithium ion battery includes a positive electrode sheet, a negative electrode sheet, an electrolyte, and a polyolefin separator.
In some embodiments of the present application, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer on the negative electrode current collector, the negative electrode active layer including a negative electrode material, such as any one of a silicon negative electrode material, a carbon negative electrode material, a silicon carbon negative electrode material, and the like.
In some embodiments of the present application, the positive electrode tab includes a positive electrode current collector and a positive electrode active layer on the positive electrode current collector, the positive electrode active layer including a positive electrode material, such as at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate, lithium nickel cobalt aluminate, lithium nickel manganese aluminate, and the like.
In some embodiments of the present application, the positive electrode active layer/negative electrode active layer further includes at least one of a conductive agent, a binder. The conductive agent includes, but is not limited to, at least one of graphite, acetylene black, carbon nanotubes, carbon fibers, and the like. The binder includes, but is not limited to, at least one of polyvinylidene fluoride, polytetrafluoroethylene, carboxymethyl cellulose, styrene-butadiene rubber, polyurethane, polyvinyl alcohol, polyvinyl butyral, and the like.
In some embodiments of the present application, the positive electrode active layer/negative electrode active layer includes 70 to 99wt% of the positive electrode active material/negative electrode active material, 0.5 to 6wt% of the conductive agent, and 0.5 to 20wt% of the binder.
In some embodiments of the present application, the positive electrode active material/negative electrode active material, the conductive agent, and the binder, when forming the positive electrode active layer/negative electrode active layer, include dispersing them in a solvent, coating on the positive electrode current collector/negative electrode current collector, and drying to obtain the positive electrode active layer/negative electrode active layer.
In some embodiments of the present application, the positive/negative current collector comprises at least one of a metal foil (e.g., aluminum foil, silver foil, tin foil, iron foil, titanium foil, nickel foil, copper foil, or an alloy foil of the foregoing), a metal mesh (e.g., aluminum mesh, silver mesh, tin mesh, iron mesh, titanium mesh, nickel mesh, copper mesh, or an alloy mesh of the foregoing).
In some embodiments of the present application, the positive electrode sheet, the negative electrode sheet, and the separator are wound, laminated, or the like to obtain a battery cell, and a lithium ion battery is fabricated.
In a fourth aspect of the present application, an electrical device is provided, where the electrical device includes the lithium ion battery. The electric equipment refers to any equipment which can utilize electric energy and convert the electric energy into mechanical energy, thermal energy, light energy and the like and forms energy by one or more of other equipment, such as an electric motor, an electric heat engine, an electric light source and the like. The system comprises mobile equipment, an electric vehicle, an electric train, a ship, a satellite, an energy storage system and the like, wherein the mobile equipment can be a mobile phone, a notebook computer, an unmanned aerial vehicle, a sweeping robot, an electronic cigarette and the like; the electric vehicle may be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf car, an electric truck, or the like.
The beneficial effects of this application are:
1) The matching use of the organic component polymer material and the inorganic component ceramic material ensures that the diaphragm coating has better affinity to electrolyte and better wettability of the diaphragm.
2) The formed three-dimensional interlocking aperture crystal frame with the non-uniform size is beneficial to improving the liquid retention capacity of the battery cell and further improving the cycle performance of the battery cell.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
Figure 1 is the XRD results of the polymer in example 1 of the present application.
FIG. 2 shows the results of the membrane infiltration test in example 1 of the present application.
FIG. 3 shows the results of the membrane infiltration test in example 2 of the present application.
FIG. 4 shows the results of the membrane infiltration test in example 3 of the present application.
FIG. 5 shows the results of the membrane infiltration test in example 4 of the present application.
FIG. 6 shows the results of the test for membrane infiltration in comparative example 1 of the present application.
FIG. 7 shows the results of the test for membrane infiltration in comparative example 2 of the present application.
Fig. 8 is the results of the cycle performance test of the present application.
Detailed Description
The conception and technical effects produced by the present application will be clearly and completely described below in connection with the embodiments to fully understand the objects, features and effects of the present application. It is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort based on the embodiments of the present application are within the scope of the present application.
The following detailed description of embodiments of the present application is exemplary and is provided merely for purposes of explanation and not to be construed as limiting the application.
In the description of the present application, the meaning of a plurality means one or more, the meaning of a plurality means two or more, and the meaning of greater than, less than, exceeding, etc. is understood to exclude the present number, and the meaning of above, below, within, etc. is understood to include the present number, and the meaning of about means within the range of ±20%, 10%, 8%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.2%, 0.1% etc. of the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, a description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present application is described below with reference to specific examples.
Example 1
This example provides a polyolefin separator, which is prepared as follows:
(1) Preparation of the slurry:
according to the mass ratio of 90:10 NMP and polymer are weighed and stirred at 1500rpm for 30min to completely dissolve, thus obtaining polymer glue solution.
According to the mass ratio of 85:15 NMP and alumina were weighed and stirred at 1500rpm for 30min to disperse, resulting in an inorganic slurry.
And mixing 20 parts by mass of polymer glue solution and 13.3 parts by mass of inorganic slurry, and uniformly stirring to obtain composite slurry.
Wherein the polymer is a mixture of PVDF and PVDF-HFP (copolymer of vinylidene fluoride and hexafluoropropylene), and the PVDF/PVDF-HFP has a mass percentage of 8%, and has characteristic peaks with molecular chain spacing at 10-40 degrees with reference to figure 1. The volume specific surface area of the alumina was measured by a particle size analyzer to be 21.9sq.m/c.c.
(2) Coating
A PE base film with a melting point of 130-160 ℃, a thickness of 3-20 mu m, a porosity of 20-50% and a permeability of 30-400 sec/100cc is selected, and the composite slurry is coated on both sides of the PE base film by gravure roll coating. The lithium ion battery diaphragm is obtained through solidification, water washing and drying, the thickness difference of the coating on the two sides is not more than 10%, and the density of the coating is 0.5-2.5 g/m 2 。
Example 2
This example provides a polyolefin separator, which is prepared as follows:
(1) Preparation of the slurry:
according to the mass ratio of 90:10 NMP and polymer are weighed and stirred at 1500rpm for 30min to completely dissolve, thus obtaining polymer glue solution.
According to the mass ratio of 85:15 NMP and alumina were weighed and stirred at 1500rpm for 30min to disperse, resulting in an inorganic slurry.
Mixing 40 parts by mass of polymer glue solution and 10 parts by mass of inorganic slurry, and uniformly stirring to obtain composite slurry.
Wherein the polymer is a mixture of PVDF and PVDF-HFP (copolymer of vinylidene fluoride and hexafluoropropylene), and the PVDF/PVDF-HFP has a mass percentage of 8%, and has characteristic peaks with molecular chain spacing at 10-40 degrees with reference to figure 1. The volume specific surface area of the alumina was 21.9sq.m/c.c.
(2) Coating
The same batch of PE base film as in example 1 was selected and the composite slurry was coated on at least one side of the PE base film by gravure roll coating. The lithium ion battery diaphragm is obtained through solidification, water washing and drying, the thickness difference of the coating on the two sides is not more than 10%, and the density of the coating is 0.5-2.5 g/m 2 。
Example 3
This example provides a polyolefin separator, which is prepared as follows:
(1) Preparation of the slurry:
according to the mass ratio of 90:10 NMP and polymer are weighed and stirred at 1500rpm for 30min to completely dissolve, thus obtaining polymer glue solution.
According to the mass ratio of 85:15 NMP and alumina were weighed and stirred at 1500rpm for 30min to disperse, resulting in an inorganic slurry.
Mixing 50 parts by mass of polymer glue solution and 6.7 parts by mass of inorganic slurry, and uniformly stirring to obtain composite slurry.
Wherein the polymer is a mixture of PVDF and PVDF-HFP (copolymer of vinylidene fluoride and hexafluoropropylene), and the PVDF/PVDF-HFP has a mass percentage of 8%, and has characteristic peaks with molecular chain spacing at 10-40 degrees with reference to figure 1. The volume specific surface area of the alumina was 21.9sq.m/c.c.
(2) Coating
The same batch of PE base film as in example 1 was selected and the composite slurry was coated on at least one side of the PE base film by gravure roll coating. The lithium ion battery diaphragm is obtained through solidification, water washing and drying, the thickness difference of the coating on the two sides is not more than 10%, and the density of the coating is 0.5-2.5 g/m 2 。
Example 4
This example provides a polyolefin separator differing from example 1 only in that the polymer in the polymer dope is polylactic acid, and the polymer has no characteristic peak of molecular chain spacing at 10 to 40 degrees.
Wettability experiment
Comparative example 1: this comparative example provides a polyolefin separator differing from example 1 only in that the coated separator slurry contains only 20 parts by mass of the inorganic slurry, and is coated onto one surface of the PE base film using gravure. The moisture in the coating was dried by an oven.
Comparative example 2: this comparative example provides a polyolefin separator differing from example 1 only in that the volume specific surface area of alumina is 63sq.m/c.c.
Ethylene carbonate, propylene carbonate, diethyl carbonate and propyl propionate are mixed according to the volume ratio of 1:1:4:4, mixing, and adding LiPF6 with the final concentration of 1mol/L to prepare the electrolyte.
The lithium ion battery separators prepared in examples 1 to 4 and comparative examples 1 to 2 were respectively taken, 10. Mu.L of the electrolyte was dropped thereon, and the electrolyte remained almost unchanged after 1min, so that photographs of 1min were taken as shown in FIGS. 2 to 7, and the diffusion radii thereof were measured, and the results are shown in Table 1.
TABLE 1 comparison of examples and comparative examples
As can be seen from fig. 2 to 7 and table 1, the separator in comparative example 1 has a surface coated with only a ceramic material, resulting in poor wettability of the electrolyte on the surface, which is reflected by a slow diffusion rate; in comparative example 2, although a combination of polymer and ceramic was used, the volume specific surface area of the ceramic material was too large, so that the wettability thereof in the electrolyte was poor; in contrast, the polymers with specific proportion and composition are combined with the ceramic materials in the examples 1-4, so that the diaphragm containing the coating has better affinity to electrolyte, the wettability of the diaphragm is better, the diffusion speed is faster, and the diffusion radius is improved by about 50%; among them, in example 4, although a polymer having a relatively close property was used, the characteristic peak of the molecular chain spacing between 10 and 40 degrees was poor in crystallinity, resulting in poor wettability of the electrolyte on the surface, and the diffusion rate was slow in the example.
Circulation experiment
According to the mass ratio of 98.2:0.5:0.3:1.0, weighing the raw materials and mixing the raw materials with solvent N-methyl pyrrolidone to prepare the positive electrode slurry with the solid content of 75 percent. And uniformly coating the positive electrode slurry on an aluminum foil current collector with the thickness of 9 mu m, wherein the coating thickness is 45 mu m, and carrying out cold pressing, slitting and cutting to obtain the positive electrode plate.
According to the mass ratio of 97.2:0.5:0.5:1.8, weighing the raw materials and mixing the raw materials with N-methylpyrrolidone serving as a solvent to prepare the negative electrode slurry with the solid content of 50%. And uniformly coating the negative electrode slurry on a copper foil current collector with the thickness of 5 mu m, wherein the coating thickness is 45 mu m, and carrying out cold pressing, slitting and cutting to obtain the negative electrode plate.
And winding the positive plate, the diaphragms of examples 1-3 or comparative example 1 and the negative plate to prepare a bare cell, and then packaging and injecting electrolyte used in wettability experiments to prepare the lithium ion battery.
The prepared lithium ion secondary battery was charged to 4.5V at a constant current of 2C, then charged to 0.05C at a constant voltage of 4.5V, left stand for 5min, then discharged to 2.8V at a constant current of 2C, which is a charge-discharge cycle process, and a plurality of cycles of charge-discharge tests were performed according to the above-described method, and the discharge capacity per cycle was recorded, and the capacity retention rate (%) of the nth cycle=the discharge capacity of the nth cycle/the discharge capacity of the 1 st cycle×100%. As a result, as shown in fig. 8, it can be seen from the graph that the capacity retention rates of the examples are all superior to those of the comparative example, with example 2 being the most preferred. Therefore, the improvement of the wettability of the diaphragm to the electrolyte is also beneficial to improving the cell liquid retention capacity, so that the rate performance and the cycle performance of the cell are improved.
Examples 4 to 11
Examples 4 to 11 respectively provide a polyolefin separator, which is different from example 2 in that polyamide, polyimide, polyacrylonitrile, polyethylene oxide, polyurethane, polyphenylene oxide, acrylate copolymer, polymethyl methacrylate, etc. having equal mass are respectively used as the polyvinylidene fluoride-based resin material.
Examples 12 to 18
Examples 12 to 18 respectively provide a polyolefin separator, which differs from example 2 in that silica, calcium oxide, magnesium oxide, zinc oxide, titanium oxide, boehmite, etc. having an equivalent mass and a volume specific surface area of 10 to 50sq.m/c.c. are used as the substitute for alumina, respectively.
Examples 4 to 18 were able to obtain similar results to example 2 when performing wettability experiments and cycle performance tests, and will not be described in detail here.
The present application has been described in detail with reference to the embodiments, but the present application is not limited to the embodiments described above, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the present application and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The polyolefin diaphragm slurry is characterized by comprising the following raw materials: 20-50 parts by mass of polymer material and 10-20 parts by mass of ceramic material; the polymeric material comprises a semi-crystalline polymer; the ceramic material has a volume specific surface area of 10-50 sq.m/c.
2. The polyolefin separator slurry according to claim 1, wherein the semi-crystalline polymer is selected from at least one of polyvinylidene fluoride resin, polyamide, polyimide, polyacrylonitrile, polyethylene oxide, polyurethane, polyphenylene oxide, acrylate copolymer, polymethyl methacrylate.
3. The polyolefin separator slurry according to claim 2, wherein the polyvinylidene fluoride resin is a homopolymer, copolymer or mixture of vinylidene fluoride.
4. The polyolefin separator slurry according to claim 1, wherein the polymeric material has a characteristic peak between 10 and 40 degrees.
5. The polyolefin separator slurry according to claim 1, wherein the ceramic material is selected from at least one of silica, alumina, silica, calcium oxide, magnesium oxide, zinc oxide, titania, boehmite.
6. The polyolefin separator slurry according to claim 1, wherein the mass ratio of the polymer material and the ceramic material is (2 to 3): 1.
7. a polyolefin separator, characterized in that the surface of the polyolefin separator has a coating layer formed of the polyolefin separator slurry according to any one of claims 1 to 6.
8. The polyolefin separator according to claim 7, wherein the coating has a density of 0.5 to 2.5g/m 2 。
9. Lithium ion battery, characterized in that it comprises a polyolefin separator according to any of claims 7 to 8.
10. A powered device comprising the lithium-ion battery of claim 9.
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