CN116526066A - Sodium battery diaphragm coating, sodium battery diaphragm and sodium battery - Google Patents
Sodium battery diaphragm coating, sodium battery diaphragm and sodium battery Download PDFInfo
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- CN116526066A CN116526066A CN202310427572.7A CN202310427572A CN116526066A CN 116526066 A CN116526066 A CN 116526066A CN 202310427572 A CN202310427572 A CN 202310427572A CN 116526066 A CN116526066 A CN 116526066A
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- China
- Prior art keywords
- sodium
- sodium battery
- conductive material
- solid electrolyte
- battery separator
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Links
- 239000011734 sodium Substances 0.000 title claims abstract description 149
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 143
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 125
- 238000000576 coating method Methods 0.000 title claims abstract description 44
- 239000011248 coating agent Substances 0.000 title claims abstract description 43
- 239000004020 conductor Substances 0.000 claims abstract description 61
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 37
- 239000011787 zinc oxide Substances 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 15
- 239000011218 binary composite Substances 0.000 claims abstract description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 25
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 20
- 229920003171 Poly (ethylene oxide) Chemical class 0.000 claims description 12
- 239000012752 auxiliary agent Substances 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 11
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 239000000080 wetting agent Substances 0.000 claims description 11
- 229920000056 polyoxyethylene ether Chemical class 0.000 claims description 8
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 229910003481 amorphous carbon Inorganic materials 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000007822 coupling agent Substances 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 4
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 4
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 4
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
- WROUWQQRXUBECT-UHFFFAOYSA-N 2-ethylacrylic acid Chemical compound CCC(=C)C(O)=O WROUWQQRXUBECT-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 150000003973 alkyl amines Chemical class 0.000 claims description 3
- 150000001408 amides Chemical class 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 3
- 150000002191 fatty alcohols Chemical class 0.000 claims description 3
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 3
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920000151 polyglycol Polymers 0.000 claims description 3
- 239000010695 polyglycol Substances 0.000 claims description 3
- 229920000193 polymethacrylate Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000011118 polyvinyl acetate Substances 0.000 claims description 3
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 3
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 3
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 claims description 2
- LKAVYBZHOYOUSX-UHFFFAOYSA-N buta-1,3-diene;2-methylprop-2-enoic acid;styrene Chemical compound C=CC=C.CC(=C)C(O)=O.C=CC1=CC=CC=C1 LKAVYBZHOYOUSX-UHFFFAOYSA-N 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 2
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 abstract description 14
- 229910001415 sodium ion Inorganic materials 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 12
- 230000001351 cycling effect Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 9
- 150000002500 ions Chemical class 0.000 abstract description 8
- 238000013508 migration Methods 0.000 abstract description 8
- 230000005012 migration Effects 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 18
- 238000002156 mixing Methods 0.000 description 14
- 239000006255 coating slurry Substances 0.000 description 10
- 238000003756 stirring Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910003249 Na3Zr2Si2PO12 Inorganic materials 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- OTYYBJNSLLBAGE-UHFFFAOYSA-N CN1C(CCC1)=O.[N] Chemical compound CN1C(CCC1)=O.[N] OTYYBJNSLLBAGE-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000010416 ion conductor Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010998 test method 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
- H01M50/449—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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
-
- 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
- H01M50/497—Ionic conductivity
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention relates to a sodium battery diaphragm coating, a sodium battery diaphragm and a sodium battery. The sodium battery diaphragm coating comprises conductive material coated solid electrolyte particles, wherein the conductive material coated solid electrolyte particles comprise a solid electrolyte core and a conductive material layer coated on the surface of the solid electrolyte core; the solid electrolyte core is made of beta-Al 2 O 3 With Na and Na 1+x Zr 2 Si x P 3‑x O 12 (0<＝x<At least one of=3); the conductive material layer is made of a binary composite material of carbon and aluminum doped zinc oxide, and the mass fraction of the aluminum doped zinc oxide in the conductive material layer is 25% -80%. The sodium battery diaphragm coating applying the technical scheme of the invention not onlyThe mechanical strength and the thermal shrinkage resistance of the diaphragm can be improved, sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
Description
Technical Field
The invention relates to the technical field of sodium batteries, in particular to a sodium battery diaphragm coating, a sodium battery diaphragm and a sodium battery.
Background
Since 90 s of the last century, lithium ion batteries rapidly occupy application markets such as 3C electrons, electric vehicles, large-scale energy storage and the like due to excellent characteristics such as higher energy density, long cycle life, environmental friendliness and the like. However, due to the scarcity of lithium resources, and the increasing price of lithium carbonate in recent years, lithium ion batteries gradually lose the core competitive advantage of low cost. Sodium ion batteries have similar performance advantages as lithium ion batteries, and while having somewhat lower energy densities, are greatly reduced in cost, and are considered to be one of the most competitive alternatives to lithium ion batteries.
However, the safety problem of sodium ion batteries during application remains to be ignored. Under the conditions of higher working temperature, overcharge, overdischarge, extrusion collision and the like, internal short circuit easily occurs in the sodium ion battery, a large amount of heat is released in a short time, and chain chemical reaction in the battery is initiated, so that potential safety hazards are generated. In this process, the separator plays a vital role in physically blocking the anode and the cathode. Uncoated base film materials used by the traditional sodium ion battery have higher thermal shrinkage, are easy to cause battery short circuit under high temperature conditions, have lower mechanical strength, cannot resist stronger mechanical impact under poor working conditions, and are easy to cause battery short circuit. And how to consider the safety and electrochemical performance of sodium ion batteries is a problem to be solved in the art.
Disclosure of Invention
Based on this, it is necessary to provide a sodium battery separator coating, a sodium battery separator and a sodium battery in view of the problem of how to improve the safety and electrochemical performance of the sodium battery.
A sodium battery separator coating comprising conductive material coated solid electrolyte particles comprising a solid electrolyte core and a conductive material layer coated on the surface of the solid electrolyte core;
the solid electrolyte core is made of beta-Al 2 O 3 With Na and Na 1+x Zr 2 Si x P 3-x O 12 (0<＝x<At least one of=3);
the conductive material layer is made of a binary composite material of carbon and aluminum-doped zinc oxide, and the mass fraction of the aluminum-doped zinc oxide in the conductive material layer is 25% -80%.
By applying the sodium battery diaphragm coating of the technical scheme of the invention, not only the mechanical strength and the thermal shrinkage resistance of the diaphragm can be improved, but also sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
In one possible implementation, the mass fraction of the aluminum doped zinc oxide in the conductive material layer is 35% -65%.
In one possible implementation manner, the carbon is at least one of crystalline carbon and amorphous carbon, and the doping amount of the Al element in the aluminum doped zinc oxide is 0.1wt% to 20wt%.
In one possible implementation, the particle size of the conductive material coated solid electrolyte particles is 100nm to 3 μm and the particle size of the solid electrolyte core is 95nm to 2.8 μm.
In one possible implementation, the particle size of the conductive material coated solid electrolyte particles is 300nm to 1 μm, and the particle size of the solid electrolyte core is 295nm to 950nm.
In one possible implementation, the sodium battery separator coating further comprises a dispersing agent, a binder, a wetting agent and an auxiliary agent, wherein the conductive material coats the solid electrolyte particles, the dispersing agent, the binder, the wetting agent and the auxiliary agent, and the mass ratio of the dispersing agent, the binder, the wetting agent and the auxiliary agent is 100 (0.1-1.0): 1-15): 2-8: 0.3-1.5.
In one possible implementation, the dispersant is at least one selected from polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, polymethacrylate, ammonium polyacrylate copolymer and polyvinyl alcohol;
the binder is at least one selected from polymethyl methacrylate styrene-butadiene rubber, polyvinylidene fluoride, styrene-acrylic emulsion, carboxymethyl cellulose, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polytetrafluoroethylene, polyvinyl acetate, polyurethane, methyl methacrylate, methacrylic acid, ethacrylic acid, polyvinylidene fluoride hexafluoropropylene copolymer, ethyl acrylate, methacrylic acid, ethyl methacrylate, propyl methacrylate and butyl methacrylate;
the wetting agent is at least one selected from polydimethylsiloxane, polyether modified siloxane, polyoxyethylene ether, polyoxyethylene alkylamine, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, octyl phenol polyoxyethylene ether, polyether siloxane, sodium alkylbenzenesulfonate, sodium alkyl sulfate and sodium lauryl sulfate;
the auxiliary agent is at least one selected from polyglycol ether, sodium carboxymethyl cellulose, sodium alginate, polyacrylamide, polyoxyethylene amide, titanate coupling agent and sodium perfluoro octoate.
A sodium battery separator, comprising a base film, wherein at least one side surface of the base film is covered with a sodium battery separator coating of any one of the above
The sodium battery diaphragm provided by the technical scheme of the invention has good mechanical strength and thermal shrinkage resistance, sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
In one possible implementation, the base film has a thickness of 5 μm to 15 μm and the sodium battery separator coating has a thickness of 0.5 μm to 5 μm.
A sodium battery comprising a sodium battery separator of any one of the above.
The sodium battery of the technical scheme of the invention has better safety and electrochemical performance and is beneficial to wide application.
Drawings
Fig. 1 is a schematic view of a sodium battery separator according to examples 1 and 3 of the present invention;
fig. 2 is a schematic view of a sodium battery separator according to examples 2 and 4 of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The sodium battery separator coating of one embodiment comprises conductive material coated solid electrolyte particles, wherein the conductive material coated solid electrolyte particles comprise a solid electrolyte core and a conductive material layer coated on the surface of the solid electrolyte core.
Wherein the solid electrolyte core is made of beta-Al 2 O 3 With Na and Na 1+x Zr 2 Si x P 3-x O 12 (0<＝x<=3). Specifically, the solid electrolyte core may be made of only beta-Al 2 O 3 Or only Na 1+x Zr 2 Si x P 3-x O 12 (0<＝x<=3), may be β -Al 2 O 3 With Na and Na 1+x Zr 2 Si x P 3-x O 12 (0<＝x<=3). Both solid electrolytes are inorganic oxide super sodium ion conductors ail, and the conductivity is as high as 10 -3 s/cm, has good air stability, low-cost and easily-obtained raw materials, and is easy for large-scale industrialized preparation.
The conductive material layer is made of a binary composite material of carbon and aluminum-doped zinc oxide, and the mass fraction of the aluminum-doped zinc oxide in the conductive material layer is 25% -80%. In the conductive material layer, carbon can provide higher electron conductivity, and the coating uniformity of the conductive material layer can be improved due to the fact that the carbon has certain lubricity; the aluminum-doped zinc oxide can improve the affinity of electrolyte on the surface of the conductive material layer on the basis of not affecting the conductive material layer, improve the electrolyte infiltration speed after the battery is injected, and ensure that the conductive material layer has higher electron conductivity and better electrolyte infiltration performance due to the mass fraction of the aluminum-doped zinc oxide in the conductive material layer of 25-80 percent.
The sodium battery diaphragm coating of the embodiment adopts the mixed conductive coating, so that the mechanical strength and the thermal shrinkage resistance of the diaphragm can be improved, sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, the ion migration resistance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
On the basis of the embodiment, the mass fraction of the aluminum doped zinc oxide in the conductive material layer is 35% -65%.
On the basis of the foregoing embodiment, carbon is selected from at least one of crystalline carbon and amorphous carbon, and the doping amount of the Al element in the aluminum-doped zinc oxide is 0.1wt% to 20wt%.
In addition to the above embodiment, the particle diameter of the solid electrolyte particles coated with the conductive material is 100nm to 3 μm, and the particle diameter of the solid electrolyte core is 95nm to 2.8 μm.
In addition to the above embodiment, the particle diameter of the solid electrolyte particles coated with the conductive material is 300nm to 1 μm, and the particle diameter of the solid electrolyte core is 295nm to 950nm.
On the basis of the embodiment, the sodium battery separator coating also comprises a dispersing agent, a binder, a wetting agent and an auxiliary agent, wherein the mass ratio of the conductive material to the solid electrolyte particles, the dispersing agent, the binder, the wetting agent and the auxiliary agent is 100 (0.1-1.0), 1-15, 2-8 and 0.3-1.5.
In addition to the foregoing embodiments, the dispersant is at least one selected from polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, polymethacrylate, ammonium polyacrylate copolymer, and polyvinyl alcohol.
In addition to the foregoing embodiments, the binder is at least one selected from the group consisting of polymethyl styrene-butadiene rubber, polyvinylidene fluoride, styrene-acrylic emulsion, carboxymethyl cellulose, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polytetrafluoroethylene, polyvinyl acetate, polyurethane, methyl methacrylate, methacrylic acid, ethacrylic acid, polyvinylidene fluoride hexafluoropropylene copolymer, ethyl acrylate, methacrylic acid, ethyl methacrylate, propyl methacrylate, and butyl methacrylate.
On the basis of the previous embodiment, the wetting agent is at least one selected from polydimethylsiloxane, polyether modified siloxane, polyoxyethylene ether, polyoxyethylene alkylamine, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, octylphenol polyoxyethylene ether, polyether siloxane, sodium alkylbenzenesulfonate, sodium alkyl sulfate and sodium lauryl sulfate.
On the basis of the previous embodiment, the auxiliary agent is at least one selected from polyglycol ether, sodium carboxymethyl cellulose, sodium alginate, polyacrylamide, polyoxyethylene amide, titanate coupling agent and sodium perfluoro octoate.
By applying the sodium battery diaphragm coating of the technical scheme of the invention, not only the mechanical strength and the thermal shrinkage resistance of the diaphragm can be improved, but also sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved. In addition, the invention is compatible with the existing secondary battery production process, can be quickly introduced into the existing battery production architecture system, and has great application value.
The sodium battery separator of an embodiment comprises a base film, at least one side surface of which is covered with a sodium battery separator coating of any one of the above.
In addition to the foregoing embodiments, the base film has a thickness of 5 μm to 15 μm and the sodium battery separator coating has a thickness of 0.5 μm to 5 μm.
Based on the foregoing embodiment, the base film is selected from at least one of a polypropylene PP film, a polyethylene PE film, a nonwoven fabric film, a fiber film, and a ceramic coating film. When the base film is selected from at least two of the above-mentioned base film types, the base film is a composite film of at least two base film types. Wherein, one side surface or two side surfaces of the base film are covered with the sodium battery diaphragm coating of any one of the above.
On the basis of the foregoing embodiment, the ceramic coating in the ceramic-coated separator is selected from at least one of alumina, boehmite, magnesia, and silica; the thickness of the ceramic coating is 0.5-4 μm.
The sodium battery diaphragm provided by the technical scheme of the invention has good mechanical strength and thermal shrinkage resistance, sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
The preparation method of the sodium battery separator in one embodiment comprises the following steps:
and S10, uniformly mixing the conductive material coated solid electrolyte particles, the dispersing agent and the solvent according to the parts by weight, fully stirring and uniformly mixing after sanding, and then adding the binder, the wetting agent and the auxiliary agent to continuously and fully stir and uniformly mixing to obtain the sodium battery diaphragm coating slurry.
Wherein the solvent is at least one selected from water, nitrogen methyl pyrrolidone, alcohol, isopropanol, cyclohexane and tetrahydrofuran.
And S20, coating the sodium battery diaphragm coating slurry on at least one side surface of the base film, and drying to obtain the sodium battery diaphragm.
In step S20, the coating may be performed by any one of a micro gravure roll coating method, a spray coating method, and a doctor blade coating method. After the sodium battery diaphragm is obtained, the sodium battery diaphragm can be further rolled for standby.
The preparation method of the sodium battery diaphragm has simple process, and the prepared sodium battery diaphragm has good mechanical strength and thermal shrinkage resistance, sodium ion conductivity and electronic conductivity can be simultaneously introduced into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the battery formation efficiency is improved, and the safety and the electrochemical performance of the sodium battery are greatly improved.
An embodiment of a sodium battery includes any of the sodium battery separators described above.
The sodium battery of the technical scheme of the invention has better safety and electrochemical performance and is beneficial to wide application.
With reference to the foregoing embodiments, the technical solutions of the present application will be illustrated for the sake of more specific clarity and easier understanding, but it should be noted that the content to be protected by the present application is not limited to the following embodiments 1 to 4.
Example 1
Coating 500g of conductive material with beta-Al 2 O 3 Uniformly mixing 5g of polyvinylpyrrolidone and 1000ml of deionized water, sufficiently stirring and uniformly mixing after sanding, and then adding 5g of polymethyl ester styrene-butadiene rubber, 10g of polydimethylsiloxane and 1.5g of polydiol ether, and continuously and sufficiently stirring and uniformly mixing to obtain the sodium battery diaphragm coating slurry. Wherein, the conductive material is coated with beta-Al 2 O 3 Has a particle diameter of 700nm, wherein beta-Al is used as a core 2 O 3 Is 680nm; the conductive material layer is made of a binary composite material of carbon and aluminum doped zinc oxide, and the carbon is crystalline carbon; the mass fraction of aluminum doped zinc oxide in the conductive material layer is 25%, and the doping amount of Al element in the aluminum doped zinc oxide is 5wt%.
And coating the sodium battery separator coating slurry on the surfaces of both sides of the base film, drying and then rolling for standby to obtain the sodium battery separator of the example 1. As shown in fig. 1, the sodium battery separator 100 of example 1 includes a base film 110, and both side surfaces of the base film 110 are covered with a sodium battery separator coating 120. Wherein the base film 110 is a wet PE film having a thickness of 12 μm and the sodium battery separator coating 120 has a thickness of 3 μm.
Example 2
Coating 200g of conductive material with beta-Al 2 O 3 Mixing 0.2g sodium polyacrylate and 900ml nitrogen methyl pyrrolidone, sanding, stirring, adding 30g polyvinylidene fluoride, 16g polyoxyethylene ether and 3g carboxylAnd continuously and fully stirring and uniformly mixing the sodium methylcellulose to obtain the sodium battery diaphragm coating slurry. Wherein the conductive material coats beta-Al 2 O 3 The particle diameter of the particles was 300nm, in which beta-Al was used as the core 2 O 3 The particle size of (2) is 295nm; the conductive material layer is made of a binary composite material of carbon and aluminum doped zinc oxide, and the carbon is crystalline carbon; the mass ratio of the aluminum doped zinc oxide in the conductive material is 80%, and the doping amount of the Al element in the aluminum doped zinc oxide is 20wt%.
And coating the sodium battery separator coating slurry on the surface of one side of the base film, drying and then rolling for standby to obtain the sodium battery separator of the example 2. As shown in fig. 2, the sodium battery separator 200 of example 2 includes a base film 210, and one side surface of the base film 210 is covered with a sodium battery separator coating 220. Wherein the base film 210 adopts a ceramic separator coated with an alumina coating layer of 1 μm thickness on both sides, the total thickness is 5 μm, and the thickness of the sodium battery separator coating layer 220 is 0.5 μm.
Example 3
1000g of conductive material is coated with Na 3 Zr 2 Si 2 PO 12 Uniformly mixing 5g of sodium polyacrylate and 2500ml of isopropanol, sufficiently stirring and uniformly mixing after sanding, and then adding 50g of polyvinylidene fluoride, 50g of polyoxyethylene ether and 10g of sodium carboxymethylcellulose, and continuously and sufficiently stirring and uniformly mixing to obtain the sodium battery diaphragm coating slurry. Wherein the conductive material is coated with Na 3 Zr 2 Si 2 PO 12 The particle diameter of the particles was 1. Mu.m, wherein Na was used as the core 3 Zr 2 Si 2 PO 12 The particle size of (3) is 950nm; the conductive material layer is made of a binary composite material of carbon and aluminum doped zinc oxide, and the carbon is amorphous carbon; the mass ratio of the aluminum doped zinc oxide in the conductive material is 35%, and the doping amount of the Al element in the aluminum doped zinc oxide is 0.1wt%.
The sodium battery separator coating slurry is coated on the surfaces of two sides of the base film, and is rolled for standby after being dried, so that the sodium battery separator of the example 3 is obtained, and the structure is shown in figure 1. Wherein the base film adopts a non-woven fabric diaphragm with the thickness of 9 mu m, and the thickness of the sodium battery diaphragm coating is 3 mu m.
Example 4
Coating 300g of conductive material with Na 3 Zr 2 Si 2 PO 12 300g of conductive material coated beta-Al 2 O 3 Uniformly mixing 4.8g of polyvinyl alcohol and 600ml of tetrahydrofuran, sufficiently stirring and uniformly mixing after sanding, and then sufficiently stirring and uniformly mixing after adding 60g of methyl methacrylate, 18g of sodium lauryl sulfate and 3.6g of titanate coupling agent to obtain the sodium battery diaphragm coating slurry. Wherein, the conductive material is coated with beta-Al 2 O 3 The particle diameter of the particles is 100nm, wherein the beta-Al is taken as the inner core 2 O 3 The grain diameter of the conductive material is 95nm, and the conductive material is coated with Na 3 Zr 2 Si 2 PO 12 The particle size of the particles was 3 μm, in which Na was used as the core 3 Zr 2 Si 2 PO 12 The particle size of (2.8 μm); the conductive material layer is made of a binary composite material of carbon and aluminum doped zinc oxide, and the carbon is amorphous carbon; the mass ratio of the aluminum doped zinc oxide in the conductive material is 65%, and the doping amount of the Al element in the aluminum doped zinc oxide is 10wt%.
The sodium battery separator coating slurry is coated on the surface of one side of the base film, and is rolled for standby after drying, so that the sodium battery separator of example 4 is obtained, and the structure is shown in fig. 2. Wherein the base film adopts a cellulose diaphragm with the thickness of 15 mu m, and the thickness of the sodium battery diaphragm coating is 5 mu m.
Comparative example 1
This comparative example is a comparative example of example 1, providing a sodium battery separator differing from example 1 only in that: beta-Al 2 O 3 Is not covered by a layer of conductive material.
Comparative example 2
This comparative example is a comparative example of example 2, providing a sodium battery separator differing from example 2 only in that: beta-Al 2 O 3 Is not covered by a layer of conductive material.
Comparative example 3
This comparative example is a comparative example of example 3, providing a sodium battery separator differing from example 3 only in that: na (Na) 3 Zr 2 Si 2 PO 12 Is not covered by a layer of conductive material.
Comparative example 4
This comparative example is a comparative example of example 4, providing a sodium battery separator differing from example 4 only in that: beta-Al 2 O 3 And Na (Na) 3 Zr 2 Si 2 PO 12 The outer surface of which is not coated with a conductive material layer.
Performance test:
(1) Puncture strength, tensile strength and heat shrinkage were measured on the sodium battery separators of examples 1 to 4 and comparative examples 1 to 4, and the specific test methods are as follows, and the test results are shown in table 1.
Puncture strength, tensile strength test: and (3) testing by using a diaphragm puncture strength tester (Jinan Yongchuang).
Heat shrinkage test: cutting a diaphragm of 0.2m by 0.2m, sandwiching the diaphragm between two glass plates, keeping the surface of the diaphragm uniform and smooth, testing the dimensions of the length (A1) and the width (B1) of the diaphragm, putting the diaphragm into an oven, setting the temperature to 130 ℃, taking out the diaphragm after standing for one hour, and testing the dimensions of the length (A2) and the width (B2) of the diaphragm after drying. Calculate the diaphragm heat shrinkage= (A2-A1) × (B2-B1)/a 1×b1.
Table 1 results of performance test of sodium battery separators of examples 1 to 4 and comparative examples 1 to 4
As can be seen from table 1, the sodium battery separators of examples 1 to 4 of the present invention have higher puncture strength and tensile strength, and significantly reduced heat shrinkage at 130 ℃ as compared with the sodium battery separators of comparative examples 1 to 4. The high mechanical strength and heat shrinkage resistance can reduce the probability of internal short circuit of the diaphragm under the poor working condition, thereby greatly improving the safety of the sodium battery.
(2) The sodium battery separators of examples 1 to 4 and comparative examples 1 to 4 were assembled with a sodium-iron-copper-manganese-oxygen positive electrode sheet and a metal sodium negative electrode sheet by a conventional method to form a button sodium battery, and the internal resistance, specific capacity and cycle capacity retention ratio after 100 weeks of cycle of the sodium battery after formation of the components were measured, and the test data are shown in Table 2. The sodium battery cycle performance test method comprises the following steps: after cycling for one week at room temperature of 25 ℃ at a rate of 0.1C, charge and discharge cycles were performed at a rate of 0.5C, and the cycle performance of the sodium battery was tested.
Table 2 results of electrochemical performance test of sodium cell separators of examples 1 to 4 and comparative examples 1 to 4 for sodium cells
As can be seen from table 2, the sodium battery separators of examples 1 to 4 of the present invention had smaller internal resistance and positive electrode gram capacity and had a higher capacity retention rate at 100 weeks of cycle, compared to the sodium batteries of comparative examples 1 to 4. The sodium battery mixed conductive coating diaphragm provided by the invention can also simultaneously introduce sodium ion conductivity and electron conductivity into the diaphragm material, so that the ion migration impedance in the cycling process of the sodium battery is reduced, the internal resistance of the sodium battery is reduced, the battery formation efficiency is improved, the exertion of gram capacity of the positive electrode material in the sodium battery is improved, the cycling performance of the sodium battery is improved, and the electrochemical performance of the sodium battery is greatly improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A sodium battery separator coating, which is characterized by comprising conductive material coated solid electrolyte particles, wherein the conductive material coated solid electrolyte particles comprise a solid electrolyte core and a conductive material layer coated on the surface of the solid electrolyte core;
the solid electrolyte core is made of beta-Al 2 O 3 With Na and Na 1+x Zr 2 Si x P 3-x O 12 (0<＝x<At least one of=3);
the conductive material layer is made of a binary composite material of carbon and aluminum-doped zinc oxide, and the mass fraction of the aluminum-doped zinc oxide in the conductive material layer is 25% -80%.
2. The sodium battery separator coating according to claim 1, wherein the mass fraction of aluminum doped zinc oxide in the conductive material layer is 35% -65%.
3. The sodium battery separator coating according to claim 1, wherein the carbon is at least one selected from crystalline carbon and amorphous carbon, and the doping amount of Al element in the aluminum-doped zinc oxide is 0.1wt% to 20wt%.
4. The sodium battery separator coating of claim 1, wherein the particle size of the conductive material coated solid electrolyte particles is 100nm to 3 μιη and the particle size of the solid electrolyte core is 95nm to 2.8 μιη.
5. The sodium battery separator coating according to claim 1 or 4, wherein the particle diameter of the conductive material-coated solid electrolyte particles is 300nm to 1 μm, and the particle diameter of the solid electrolyte core is 295nm to 950nm.
6. The sodium battery separator coating according to claim 1, further comprising a dispersant, a binder, a wetting agent and an auxiliary agent, wherein the conductive material coats the solid electrolyte particles, the dispersant, the binder, the wetting agent and the auxiliary agent in a mass ratio of 100 (0.1-1.0): 1-15): 2-8): 0.3-1.5.
7. The sodium battery separator coating of claim 6, wherein the dispersant is selected from at least one of polyvinylpyrrolidone, sodium polyacrylate, polyethylene glycol, polymethacrylate, ammonium polyacrylate copolymer, and polyvinyl alcohol;
the binder is at least one selected from polymethyl methacrylate styrene-butadiene rubber, polyvinylidene fluoride, styrene-acrylic emulsion, carboxymethyl cellulose, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polytetrafluoroethylene, polyvinyl acetate, polyurethane, methyl methacrylate, methacrylic acid, ethacrylic acid, polyvinylidene fluoride hexafluoropropylene copolymer, ethyl acrylate, methacrylic acid, ethyl methacrylate, propyl methacrylate and butyl methacrylate;
the wetting agent is at least one selected from polydimethylsiloxane, polyether modified siloxane, polyoxyethylene ether, polyoxyethylene alkylamine, polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, octyl phenol polyoxyethylene ether, polyether siloxane, sodium alkylbenzenesulfonate, sodium alkyl sulfate and sodium lauryl sulfate;
the auxiliary agent is at least one selected from polyglycol ether, sodium carboxymethyl cellulose, sodium alginate, polyacrylamide, polyoxyethylene amide, titanate coupling agent and sodium perfluoro octoate.
8. A sodium battery separator comprising a base film, at least one side surface of which is covered with the sodium battery separator coating of any one of claims 1 to 7.
9. The sodium battery separator according to claim 8, wherein the thickness of the base film is 5 to 15 μm and the thickness of the sodium battery separator coating is 0.5 to 5 μm.
10. A sodium battery comprising the sodium battery separator of claim 8 or 9.
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| CN118398827A (en) * | 2024-06-25 | 2024-07-26 | 江苏中兴派能电池有限公司 | Negative electrode current collector, preparation method thereof and negative electrode-free sodium metal battery |
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