Positive pole piece of lithium battery, preparation method of positive pole piece and lithium battery adopting positive pole piece

A technology for positive pole pieces and lithium-ion batteries, which is applied to battery electrodes, non-aqueous electrolyte storage battery electrodes, and secondary batteries. The effect of high specific capacity and slow cycle decay

Pending Publication Date: 2022-07-01
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a lithium battery positive pole piece and its preparation method and a lithium battery using the positive pole piece, aiming to solve the problems of low first effect, fast cycle decay and low specific capacity in the prior art

Method used

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  • Positive pole piece of lithium battery, preparation method of positive pole piece and lithium battery adopting positive pole piece
  • Positive pole piece of lithium battery, preparation method of positive pole piece and lithium battery adopting positive pole piece

Examples

Experimental program
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Effect test

preparation example Construction

[0022] (1) Preparation of graphene slurry

[0023] According to graphene powder (mass ratio 85%-89%), binder PVDF (mass ratio 11%-15%), NMP solvent, the binder includes: polyvinylidene fluoride, polyhexafluoropropylene- Copolymers of polyvinylidene fluoride, polyvinyl acetate, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, alkylated polyethylene oxide, polyvinyl ether, polymethyl methacrylate, polyvinyl At least one of ethyl acrylate, polytetrafluoroethylene, polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, styrene-butadiene rubber, and acrylonitrile-butadiene rubber;

[0024] The solvent includes at least one of N-methyl-2-pyrrolidone, dimethylformamide, dimethylacetamide, N,N-dimethylaminopropylamine, ethylene oxide and tetrahydrofuran.

[0025] Add solvent according to the solid content of graphene slurry 20%-45%, mix materials according to revolution 25rpm / rotation 3000rpm, after mixing, stir evenly in a stirring pot to obtain graphene slurry, and ...

Embodiment 1

[0032] (1) Preparation of graphene slurry

[0033] Take 2000g of graphene powder and 200g of polyvinylidene fluoride and mix, add N-methyl-2-pyrrolidone according to the solid content of graphene slurry 45%, mix materials according to revolution 25rpm / rotation 3000rpm, and stir in a stirring pot after mixing The graphene slurry was uniformly obtained, and the viscosity of the graphene slurry was controlled at 3000cp.

[0034] (2) Preparation of lithium-rich lithium manganate

[0035] First, take 10,000 g of lithium-rich manganate Li (Li 1 / 3 Mn 2 / 3 )O 2 , 208.33g of carbon nanotubes, 208.33g of polyhexafluoropropylene-polyvinylidene fluoride copolymer, mixed with solvent NMP (N-methyl-2-pyrrolidone), the solid content is controlled at 50%, after mixing, in a stirring pot Stir evenly to obtain lithium-rich lithium manganate slurry.

[0036] (3) Preparation of ternary (lithium nickel cobalt manganate)

[0037] 10000g Li (Ni 0.8 Co 0.1 Mn 0.1 )O 2 , 51.5g carbon nanotube...

Embodiment 2

[0041] (1) Preparation of graphene slurry

[0042] Take 2000g graphene powder and 200g polyvinylidene fluoride and mix, add N-methyl-2-pyrrolidone according to the solid content of graphene slurry 45%, mix materials according to revolution 25rpm / rotation 3000rpm, and stir in a stirring pot after mixing The graphene slurry was uniformly obtained, and the viscosity of the graphene slurry was controlled at 3000cp.

[0043] (2) Preparation of lithium-rich lithium manganate

[0044] First, take 10,000 g of lithium-rich manganate Li (Li 1 / 3 Mn 2 / 3 )O 2 , 208.33g carbon nanotubes, 208.33g polyhexafluoropropylene-polyvinylidene fluoride copolymer, mixed with solvent NMP, the solid content is controlled at 50%, and after mixing, stir well in a stirring pot to obtain lithium-rich lithium manganate slurry material.

[0045] (3) Preparation of ternary (lithium nickel cobalt manganate)

[0046] 10000g Li (Ni 0.8 C0 0.1 Mn 0.1 )O 2 , 51.5g carbon nanotubes, 103.1g conductive agent...

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Abstract

The invention discloses a lithium battery positive pole piece, a preparation method thereof and a lithium battery adopting the positive pole piece, and belongs to the field of lithium ion power batteries. The positive pole piece comprises a positive current collector and a positive coating layer, the positive current collector has two opposite surfaces, and the positive coating layer is arranged on at least one surface of the positive current collector; and the positive electrode coating layer comprises a first coating layer, a second coating layer and a third coating layer from one side of the positive electrode current collector to the outside. The lithium-rich lithium manganate in the positive pole piece is low in price, and several materials are mixed, so that the material cost and the battery cost can be reduced, and the benefit is increased. The technical process method is simple, the battery capacity is improved on the premise that the sizes of the battery and the battery pack are not changed, and the safety performance of the battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion power batteries, and particularly relates to a lithium battery positive pole piece, a preparation method thereof, and a lithium battery using the positive pole piece. Background technique [0002] Lithium-rich manganese-based solid solution cathode material xLi[Li 1 / 3 Mn 2 / 3 ]O 2 ·(1-x)LiMO 2 to express, where M is a transition metal (Mn, Ni, Co, Ni-Mn, etc.), and the molecular formula can also be written as Li[Li x / 3 Mn 2x / 3 ·M 1-x ]O 2 . Due to the complex composition of lithium-rich cathode materials (the combination of M / Mn and the change of x), the structure of the material is very complex, and the material difference is also closely related to the preparation method of the material. Lithium-rich manganese oxide Li (Li 1 / 3 Mn 2 / 3 )O 2 , is a relatively mature material, lithium-rich lithium manganate Li (Li 1 / 3 Mn 2 / 3 )O 2 The material has a very different charge-discharge mechanism fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/0525
CPCH01M4/13H01M4/139H01M4/131H01M4/1391H01M10/0525
Inventor 朱庆权何广唐怀远周贤机王雯雯杨泽龙姚秋实陈客举陈跃武
Owner TIANNENG BATTERY GROUP
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