CN112751075A - Lithium ion battery and preparation method thereof - Google Patents
Lithium ion battery and preparation method thereof Download PDFInfo
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- CN112751075A CN112751075A CN201911055661.3A CN201911055661A CN112751075A CN 112751075 A CN112751075 A CN 112751075A CN 201911055661 A CN201911055661 A CN 201911055661A CN 112751075 A CN112751075 A CN 112751075A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 100
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000011248 coating agent Substances 0.000 claims abstract description 82
- 238000000576 coating method Methods 0.000 claims abstract description 82
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 67
- 239000011230 binding agent Substances 0.000 claims abstract description 45
- 239000006258 conductive agent Substances 0.000 claims abstract description 39
- 239000011267 electrode slurry Substances 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000013543 active substance Substances 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 21
- 239000003792 electrolyte Substances 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 239000004698 Polyethylene Substances 0.000 claims description 38
- -1 polyethylene Polymers 0.000 claims description 38
- 229920000573 polyethylene Polymers 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 27
- 229910021389 graphene Inorganic materials 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 25
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 21
- 238000005229 chemical vapour deposition Methods 0.000 claims description 19
- 239000007773 negative electrode material Substances 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 239000011889 copper foil Substances 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 11
- 239000007774 positive electrode material Substances 0.000 claims description 10
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 6
- 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 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 6
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 6
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910021382 natural graphite Inorganic materials 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 claims description 2
- 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 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 229920001289 polyvinyl ether Polymers 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical group O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 description 4
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 4
- 229910002991 LiNi0.5Co0.2Mn0.3O2 Inorganic materials 0.000 description 4
- 229910001290 LiPF6 Inorganic materials 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 229910003002 lithium salt Inorganic materials 0.000 description 4
- 159000000002 lithium salts Chemical class 0.000 description 4
- 239000012046 mixed solvent Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- QTHKJEYUQSLYTH-UHFFFAOYSA-N [Co]=O.[Ni].[Li] Chemical compound [Co]=O.[Ni].[Li] QTHKJEYUQSLYTH-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research 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
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/626—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to the technical field of batteries, in particular to a lithium ion battery and a preparation method thereof. The preparation method of the lithium ion battery provided by the invention comprises the steps of mixing a positive active substance, a conductive agent, a binder, modified aluminum powder and a solvent, preparing positive slurry, coating the positive slurry on a positive current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a positive pole piece; mixing a negative electrode active substance, a conductive agent, a binder and a solvent to prepare a negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a negative electrode piece; and assembling the positive pole piece, the negative pole piece, the diaphragm and the electrolyte into the lithium ion battery. The modified aluminum powder is added into the positive electrode slurry and is matched with the positive electrode active substance, the conductive agent and the binder, so that the charge-discharge efficiency and the cycle service life of the lithium ion battery can be improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a lithium ion battery and a preparation method thereof.
Background
With the continuous development of electronic and energy technologies, people are facing CO2And the attention on the emission of automobile exhaust is continuously increasedElectric vehicles are becoming the development trend in the future. As one of the core components of electric vehicles, research and application of lithium ion batteries are receiving attention.
The existing lithium ion battery usually adopts lithium cobaltate, lithium manganate, lithium nickel manganese oxide and the like as positive active materials, and adopts artificial graphite, natural graphite and the like as negative active materials, and because the conductivity of the active materials is poor, the internal resistance of the electrode is large, the charging and discharging efficiency and the cycle service life of the battery can be seriously influenced. In order to solve the above problems, the prior art is mainly improved by the following means: (1) modifying the positive and negative electrode active materials; (2) an improvement conductive agent; (3) improving the electrolyte and the diaphragm; (4) improving the manufacturing process of the battery; (5) the current collector is improved. The improvement effect on the current collector and the positive and negative electrode active materials is most remarkable. However, the modification of the active material of the battery cathode in the prior art has poor effects on improving the charge-discharge efficiency and the cycle service life of the battery.
Disclosure of Invention
The invention aims to solve the problems that the charge-discharge efficiency and the cycle service life of a battery cannot be obviously improved due to the modification of a battery active material in the prior art, and further provides a lithium ion battery and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a lithium ion battery comprises the following steps:
1) mixing a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent to prepare a positive electrode slurry, coating the positive electrode slurry on a positive electrode current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a positive electrode piece; the mass ratio of the positive electrode active substance to the conductive agent to the binder to the modified aluminum powder is 96-99%: 0.6-2.0%: 0.6-2.0%: 0.3 to 1.0 percent;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent to prepare a negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a negative electrode piece; the mass ratio of the negative electrode active material to the conductive agent to the binder is 92-96%: 0.6-2.0%: 0.6-2.0%;
3) and assembling the positive pole piece, the negative pole piece, the diaphragm and the electrolyte into the lithium ion battery.
The method for assembling the positive pole piece, the negative pole piece, the diaphragm and the electrolyte into the lithium ion battery is a conventional technical method in the field, and specifically comprises the steps of assembling, injecting, forming, baking a clamp and grading.
Preferably, in step 1), the preparation method of the modified aluminum powder comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at the temperature of 120-130 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder.
Preferably, the mass ratio of the aluminum powder to the polyethylene wax is 100: 5-17.
Preferably, the mass ratio of the aluminum powder to the polyethylene wax is 100: 11.
Preferably, the particle size of the modified aluminum powder is 30-50 nm.
Preferably, the material in the carbon-containing conductive coating is graphene;
in the step 1), the carbon-containing conductive coating is formed on the surface of the positive current collector by the graphene through a chemical vapor deposition method, so that the positive current collector with the carbon-containing conductive coating on the surface is obtained;
in the step 2), the carbon-containing conductive coating is formed on the surface of the negative current collector by the graphene through a chemical vapor deposition method, so that the negative current collector with the carbon-containing conductive coating on the surface is obtained.
In the present invention, the chemical vapor deposition method is a conventional preparation method in the art. The step of forming the carbon-containing conductive coating on the surface of the negative current collector by a chemical vapor deposition method comprises the following steps: putting the negative current collector into a reaction chamber for chemical vapor deposition, and introducing C when the temperature in the reaction chamber reaches 810 DEG C2H2Ar/C with a content of 9%2H2The gas is mixed with the mixture of the air and the water,and preserving the heat for 0.8h to obtain the negative current collector with the surface provided with the carbon-containing conductive coating.
The step of forming the carbon-containing conductive coating on the surface of the positive current collector by a chemical vapor deposition method comprises the following steps: putting the positive current collector into a reaction chamber for chemical vapor deposition, and introducing C when the temperature in the reaction chamber reaches 800 DEG C2H2Ar/C with a content of 10%2H2Mixing the gases, preserving the heat for 0.8h, and obtaining the anode current collector with the surface provided with the carbon-containing conductive coating after the heat preservation is finished.
Preferably, the binder is one or more selected from polyvinylidene fluoride, styrene-acrylate copolymer, polyacrylonitrile, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone and polyvinyl ether;
the conductive agent is selected from one or more of conductive carbon black, lamellar graphite, carbon fiber and carbon nano tube;
the solvent is water or N-methyl pyrrolidone.
Preferably, the positive active material is selected from one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganate, lithium iron phosphate, lithium nickel cobalt aluminate, lithium nickel cobalt oxide and lithium nickel oxide;
the negative active material is selected from one or more of artificial graphite, natural graphite and silicon carbide.
Preferably, the positive current collector is an aluminum foil, and the negative current collector is a copper foil.
The invention also provides a lithium ion battery prepared by the preparation method.
The invention has the beneficial effects that:
1) according to the preparation method of the lithium ion battery, the modified aluminum powder is added into the positive electrode slurry, the modified aluminum powder is matched with the positive electrode active substance, the conductive agent and the binder by utilizing the excellent conductive performance and stability of the modified aluminum powder, the obtained positive electrode plate is assembled with the negative electrode plate, the diaphragm and the electrolyte obtained by the specific method, so that the lithium ion battery is obtained, and through tests, the charge-discharge efficiency and the cycle service life of the lithium ion battery are remarkably improved. Meanwhile, the carbon-containing conductive coating arranged on the surfaces of the positive and negative current collectors can effectively reduce the resistance and enhance the binding force between the current collectors and the active material, so that the charge-discharge efficiency of the battery is further improved and the cycle service life of the battery is further prolonged.
2) The preparation method of the lithium ion battery provided by the invention further comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at the temperature of 120-130 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder. According to the invention, through the specific method, the polyethylene wax is used for modifying the aluminum powder, and tests show that the obtained modified aluminum powder is beneficial to improving the charge-discharge efficiency and the cycle service life of the battery, and meanwhile, the heat release phenomenon of the lithium ion battery in the discharge process can be improved.
3) The preparation method of the lithium ion battery provided by the invention further comprises the step of enabling the mass ratio of the aluminum powder to the polyethylene wax to be 100: 5-17. According to the invention, the mass ratio of the aluminum powder to the polyethylene wax is controlled to be 100:5-17, under the specific proportion, a part of aluminum powder is only partially coated by the polyethylene wax, the high conductivity of the aluminum powder is not influenced, and tests show that the modified aluminum powder obtained according to the proportion can further improve the charge-discharge efficiency and the cycle service life of the battery.
4) The preparation method of the lithium ion battery provided by the invention is further characterized in that the material in the carbon-containing conductive coating is graphene; in the step 1), the carbon-containing conductive coating is formed on the surface of the positive current collector by the graphene through a chemical vapor deposition method, so that the positive current collector with the carbon-containing conductive coating on the surface is obtained; in the step 2), the carbon-containing conductive coating is formed on the surface of the negative current collector by the graphene through a chemical vapor deposition method, so that the negative current collector with the carbon-containing conductive coating on the surface is obtained. Compared with the existing wet coating technology, the method has the advantages of simple operation, short preparation period and uniform prepared carbon-containing conductive coating.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides a preparation method of a lithium ion battery, which comprises the following steps:
1) mixing and stirring a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent at the stirring speed of 40rpm for 3 hours to prepare a positive electrode slurry, passing the obtained positive electrode slurry through a 150-mesh screen, coating the positive electrode slurry on an aluminum foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a positive electrode piece; wherein the positive electrode active material is LiNi0.5Co0.2Mn0.3O2The conductive agent is conductive carbon black, the binder is polyvinylidene fluoride, the solvent is N-methyl pyrrolidone, and the mass ratio of the positive electrode active substance to the conductive agent to the binder to the modified aluminum powder is 96%: 2.0%: 0.6%: 1.0 percent; the adding amount of the solvent is 20 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the aluminum foil by the graphene through a chemical vapor deposition method, the aluminum foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 22 nm;
the preparation method of the modified aluminum powder comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at 120 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder; the mass ratio of the aluminum powder to the polyethylene wax is 100: 5; the particle size of the modified aluminum powder obtained after crushing is 30 nm;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent at a stirring speed of 40rpm for 3 hours to prepare a negative electrode slurry, sieving the obtained negative electrode slurry with a 150-mesh sieve, coating the obtained negative electrode slurry on a copper foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a negative electrode piece; the negative electrode active material is artificial graphite, the conductive agent is conductive carbon black, the binder is sodium carboxymethylcellulose, the solvent is water, and the mass ratio of the negative electrode active material to the conductive agent to the binder is 92%: 2.0%: 0.6 percent; the adding amount of the solvent is 80 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the copper foil by the graphene through a chemical vapor deposition method, so that the copper foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 23 nm;
3) and assembling the positive pole piece, the negative pole piece, a diaphragm (the diaphragm is made of polyethylene surface-coated ceramic, the average porosity is 47%) and an electrolyte (the solvent of the electrolyte is a binary mixed solvent of ethylene carbonate and ethyl acetate, the lithium salt is LiPF6, and the auxiliary agent is vinylene carbonate and fluoroethylene carbonate) into the lithium ion battery.
Example 2
The embodiment provides a preparation method of a lithium ion battery, which comprises the following steps:
1) mixing and stirring a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent at the stirring speed of 40rpm for 3 hours to prepare a positive electrode slurry, passing the obtained positive electrode slurry through a 150-mesh screen, coating the positive electrode slurry on an aluminum foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a positive electrode piece; wherein the positive electrode active material is LiNi0.5Co0.2Mn0.3O2The conductive agent is lamellar graphite, the binder is polyvinylidene fluoride, the solvent is N-methyl pyrrolidone, and the positive active material, the conductive agent and the adhesive are mixedThe mass ratio of the caking agent to the modified aluminum powder is 99%: 0.6%: 2.0%: 0.3 percent; the adding amount of the solvent is 20 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the aluminum foil by the graphene through a chemical vapor deposition method, the aluminum foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 22 nm;
the preparation method of the modified aluminum powder comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at 130 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder; the mass ratio of the aluminum powder to the polyethylene wax is 100: 17; the particle size of the modified aluminum powder obtained after crushing is 50 nm;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent at a stirring speed of 40rpm for 3 hours to prepare a negative electrode slurry, sieving the obtained negative electrode slurry with a 150-mesh sieve, coating the obtained negative electrode slurry on a copper foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a negative electrode piece; the negative electrode active material is artificial graphite, the conductive agent is conductive carbon black, the binder is sodium carboxymethylcellulose, the solvent is water, and the mass ratio of the negative electrode active material to the conductive agent to the binder is 96%: 0.6%: 2.0 percent; the adding amount of the solvent is 80 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the copper foil by the graphene through a chemical vapor deposition method, so that the copper foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 23 nm;
3) and assembling the positive pole piece, the negative pole piece, a diaphragm (the diaphragm is made of polyethylene surface-coated ceramic, the average porosity is 47%) and an electrolyte (the solvent of the electrolyte is a binary mixed solvent of ethylene carbonate and ethyl acetate, the lithium salt is LiPF6, and the auxiliary agent is vinylene carbonate and fluoroethylene carbonate) into the lithium ion battery.
Example 3
The embodiment provides a preparation method of a lithium ion battery, which comprises the following steps:
1) mixing and stirring a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent at the stirring speed of 40rpm for 3 hours to prepare a positive electrode slurry, passing the obtained positive electrode slurry through a 150-mesh screen, coating the positive electrode slurry on an aluminum foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a positive electrode piece; wherein the positive electrode active material is LiNi0.5Co0.2Mn0.3O2The conductive agent is conductive carbon black, the binder is polyvinylidene fluoride, the solvent is N-methyl pyrrolidone, and the mass ratio of the positive electrode active substance to the conductive agent to the binder to the modified aluminum powder is 98%: 0.8%: 1.0%: 0.6 percent; the adding amount of the solvent is 20 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the aluminum foil by the graphene through a chemical vapor deposition method, the aluminum foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 22 nm;
the preparation method of the modified aluminum powder comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at 120 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder; the mass ratio of the aluminum powder to the polyethylene wax is 100: 11; the particle size of the modified aluminum powder obtained after crushing is 40 nm;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent at a stirring speed of 40rpm for 3 hours to prepare a negative electrode slurry, sieving the obtained negative electrode slurry with a 150-mesh sieve, coating the obtained negative electrode slurry on a copper foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a negative electrode piece; the negative electrode active material is artificial graphite, the conductive agent is conductive carbon black, the binder is sodium carboxymethylcellulose, the solvent is water, and the mass ratio of the negative electrode active material to the conductive agent to the binder is 95%: 0.8%: 1.2 percent; the adding amount of the solvent is 80 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the copper foil by the graphene through a chemical vapor deposition method, so that the copper foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 23 nm;
3) and assembling the positive pole piece, the negative pole piece, a diaphragm (the diaphragm is made of polyethylene surface-coated ceramic, the average porosity is 47%) and an electrolyte (the solvent of the electrolyte is a binary mixed solvent of ethylene carbonate and ethyl acetate, the lithium salt is LiPF6, and the auxiliary agent is vinylene carbonate and fluoroethylene carbonate) into the lithium ion battery.
Example 4
The embodiment provides a preparation method of a lithium ion battery, which comprises the following steps:
1) mixing and stirring a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent at the stirring speed of 40rpm for 3 hours to prepare a positive electrode slurry, passing the obtained positive electrode slurry through a 150-mesh screen, coating the positive electrode slurry on an aluminum foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a positive electrode piece; wherein the positive electrode active material is LiNi0.5Co0.2Mn0.3O2The conductive agent is conductive carbon black, the binder is polyvinylidene fluoride, the solvent is N-methyl pyrrolidone, and the mass ratio of the positive electrode active substance to the conductive agent to the binder to the modified aluminum powder is 97%: 0.9%: 0.8%: 0.6 percent; the adding amount of the solvent is 20 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the aluminum foil by the graphene through a chemical vapor deposition method, the aluminum foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 22 nm;
the preparation method of the modified aluminum powder comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at 125 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder; the mass ratio of the aluminum powder to the polyethylene wax is 100: 9; the particle size of the modified aluminum powder obtained after crushing is 40 nm;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent at a stirring speed of 40rpm for 3 hours to prepare a negative electrode slurry, sieving the obtained negative electrode slurry with a 150-mesh sieve, coating the obtained negative electrode slurry on a copper foil with a carbon-containing conductive coating on the surface, and then drying, rolling and slitting to obtain a negative electrode piece; the negative electrode active material is artificial graphite, the conductive agent is conductive carbon black, the binder is sodium carboxymethylcellulose, the solvent is water, and the mass ratio of the negative electrode active material to the conductive agent to the binder is 94%: 0.9%: 1.2 percent; the adding amount of the solvent is 80 times of the mass of the binder; the material in the carbon-containing conductive coating is graphene, the carbon-containing conductive coating is formed on the surface of the copper foil by the graphene through a chemical vapor deposition method, so that the copper foil with the carbon-containing conductive coating on the surface is obtained, and the thickness of the carbon-containing conductive coating is 23 nm;
3) and assembling the positive pole piece, the negative pole piece, a diaphragm (the diaphragm is made of polyethylene surface-coated ceramic, the average porosity is 47%) and an electrolyte (the solvent of the electrolyte is a binary mixed solvent of ethylene carbonate and ethyl acetate, the lithium salt is LiPF6, and the auxiliary agent is vinylene carbonate and fluoroethylene carbonate) into the lithium ion battery.
Comparative example 1
Compared with the embodiment 3, the preparation method of the lithium ion battery provided by the comparative example is different in that no modified aluminum powder is added in the preparation process of the positive pole piece.
Comparative example 2
Compared with example 3, the difference of the preparation method of the lithium ion battery provided by the comparative example is that in the preparation step of the modified aluminum powder, the mass ratio of the aluminum powder to the polyethylene wax is 1: 2.
And (3) performance testing:
the lithium ion batteries obtained in the above examples and comparative examples were subjected to performance tests, and in the charge-discharge efficiency test, the charge-discharge efficiency was 0.5C discharge/0.5C charge × 100%; in the cycle performance test, the cycle use times of the battery are respectively measured when the battery capacity is reduced to 80% under the 5C discharge rate; the temperature of the surface of the cell at a discharge rate of 10C was also measured, and the results are shown in table 1.
TABLE 1 lithium ion Battery Performance test
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A preparation method of a lithium ion battery is characterized by comprising the following steps:
1) mixing a positive electrode active substance, a conductive agent, a binder, modified aluminum powder and a solvent to prepare a positive electrode slurry, coating the positive electrode slurry on a positive electrode current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a positive electrode piece; the mass ratio of the positive electrode active substance to the conductive agent to the binder to the modified aluminum powder is 96-99%: 0.6-2.0%: 0.6-2.0%: 0.3 to 1.0 percent;
2) mixing a negative electrode active substance, a conductive agent, a binder and a solvent to prepare a negative electrode slurry, coating the negative electrode slurry on a negative electrode current collector with a carbon-containing conductive coating on the surface, and drying, rolling and slitting to obtain a negative electrode piece; the mass ratio of the negative electrode active material to the conductive agent to the binder is 92-96%: 0.6-2.0%: 0.6-2.0%;
3) and assembling the positive pole piece, the negative pole piece, the diaphragm and the electrolyte into the lithium ion battery.
2. The method according to claim 1, wherein the method for preparing the modified aluminum powder in step 1) comprises the following steps: mixing aluminum powder, polyethylene wax and toluene at the temperature of 120-130 ℃, drying after mixing to obtain a solid mixed material of the aluminum powder and the polyethylene wax, and crushing the solid mixed material of the aluminum powder and the polyethylene wax to obtain the modified aluminum powder.
3. The preparation method according to claim 2, wherein the mass ratio of the aluminum powder to the polyethylene wax is 100: 5-17.
4. The production method according to claim 3, wherein the mass ratio of the aluminum powder to the polyethylene wax is 100: 11.
5. The production method according to any one of claims 1 to 4, wherein the modified aluminum powder has a particle size of 30 to 50 nm.
6. The production method according to any one of claims 1 to 5, wherein the material in the carbon-containing conductive coating is graphene;
in the step 1), the carbon-containing conductive coating is formed on the surface of the positive current collector by the graphene through a chemical vapor deposition method, so that the positive current collector with the carbon-containing conductive coating on the surface is obtained;
in the step 2), the carbon-containing conductive coating is formed on the surface of the negative current collector by the graphene through a chemical vapor deposition method, so that the negative current collector with the carbon-containing conductive coating on the surface is obtained.
7. The method according to any one of claims 1 to 6, wherein the binder is one or more selected from polyvinylidene fluoride, styrene-acrylate copolymer, polyacrylonitrile, polyacrylate, sodium carboxymethyl cellulose, polyvinylpyrrolidone, and polyvinyl ether;
the conductive agent is selected from one or more of conductive carbon black, lamellar graphite, carbon fiber and carbon nano tube;
the solvent is water or N-methyl pyrrolidone.
8. The production method according to any one of claims 1 to 7, wherein the positive electrode active material is selected from one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganate, lithium iron phosphate, lithium nickel cobalt aluminate, lithium nickel cobaltate, and lithium nickelate;
the negative active material is selected from one or more of artificial graphite, natural graphite and silicon carbide.
9. The method according to any one of claims 1 to 8, wherein the positive electrode current collector is an aluminum foil and the negative electrode current collector is a copper foil.
10. A lithium ion battery produced by the production method according to any one of claims 1 to 9.
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