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Lithium ion battery manufacturing process

A lithium-ion battery and manufacturing process technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of metal lithium being easily oxidized and burned, and it is not easy to control the amount of lithium supplementation, so as to achieve no safety risks. , Small investment, the effect of improving utilization

Inactive Publication Date: 2018-10-19
江西中汽瑞华新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the negative electrode spraying lithium powder method and the diaphragm lithium plating method have very strict requirements on production conditions. Metal lithium is easily oxidized and burned, and it is not easy to control the amount of lithium supplementation. This requires the transformation of the production line and the purchase of expensive lithium supplementation equipment. , at the same time, in order to ensure the effect of lithium supplementation, the existing production process needs to be adjusted

Method used

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  • Lithium ion battery manufacturing process
  • Lithium ion battery manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] LiFePO 4 and Li 5 FeO 4 It is a positive active material, and is weighed with acetylene black and polyvinylidene fluoride in a mass ratio of 90:5:3:2. Then polyvinylidene fluoride (PVDF) was added to N-methylpyrrolidone (NMP) for dispersion. After the dispersion was complete, acetylene black and LiFePO were added in turn. 4 and Li 5 FeO 4 , stir evenly, then add NMP solvent, control the solid content of the slurry to 56%, and the viscosity of the slurry to 8500±500cps; pass the slurry through a 150-mesh mesh screen, apply roll pressing and cut into positive plates that meet the requirements ;

[0041] Mix graphite powder with SPC65, CMC, SBR according to the requirements of negative electrode ingredients, control the solid content at 46%, and control the viscosity at 3000±500cps; The required negative electrode;

[0042] After welding the fabricated positive and negative electrode tabs, transfer to the assembly process, and assemble together with the separator in...

Embodiment 2

[0044] In addition to LiFePO 4 and Li 6 CoO 4 It is a positive active material, and is weighed with acetylene black and polyvinylidene fluoride in a mass ratio of 91:4:3:2. The rest are the same as in Example 1.

Embodiment 3

[0046] In addition to LiMnPO 4 and Li 5 FeO 4 It is a positive active material, and is weighed with acetylene black and polyvinylidene fluoride in a mass ratio of 87:8:3:2. The rest are the same as in Example 1.

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Abstract

The invention discloses a lithium ion battery manufacturing process which comprises the following steps: dispersing an adhesive into a solvent so as to obtain an adhesive liquid, and after the adhesive is completely dispersed, sequentially adding a conductive agent, a phosphate anode material and a lithium-enriched metal oxide so as to obtain anode slurry; coating an anode current collector by theanode slurry so as to obtain an anode piece; dispersing a dispersant into a solvent, after the dispersant is completely dispersed, sequentially adding carbon powder, the conductive agent and SBR (Styrene Butadiene Rubber) so as to obtain cathode slurry; coating a cathode current collector by the cathode slurry so as to obtain a cathode piece; by respectively taking the obtained anode and cathodepieces as an anode and a cathode, cellulose paper as a membrane, and commercial lithium ion battery electrolyte as electrolyte, assembling a power soft roll battery of 5Ah. By adopting the lithium ionbattery manufacturing process, a lithium replenishing process is simple, a conventional production line or process does not need to be transformed, small investment is needed, and security risks canbe completely avoided; due to adoption of the lithium-enriched metal oxide in the anode material, the utilization rate, the first charge / discharge efficiency and the circulation life of the anode material can be increased.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a positive electrode material containing additives and a lithium ion battery. Background technique [0002] In the traditional energy development, lithium-ion batteries, as the main rechargeable energy device, played an important role in the past energy development. With the continuous development of the level of information technology, new energy sources continue to flood into the market, and higher requirements are placed on the energy density and lifespan of lithium-ion batteries. [0003] At present, the mainstream commercial cathode materials include lithium manganate, lithium cobaltate, and binary or ternary materials formed by replacing part of cobalt in lithium cobaltate with nickel or manganese. The material itself of lithium manganate is not very stable, the cycle life decays rapidly, it is prone to bulge, the high temperature performance is poor, and the life is r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M4/36H01M4/58H01M4/525
CPCH01M4/362H01M4/525H01M4/5825H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈伟王海文范进雷
Owner 江西中汽瑞华新能源科技有限公司