Formation method of lithium ion battery

A technology of lithium ion battery and chemical formation method, which is applied in the field of high current formation of lithium ion batteries, can solve problems such as low production efficiency and long formation process time, and achieve the effects of good electrical performance, shortening formation time and improving low temperature performance.

Inactive Publication Date: 2012-08-15
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process needs to stand still for 2 to 3 days after liquid injection, and uses a small current for formation. The entire formation process takes a long time. The liquid injection hole needs t

Method used

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  • Formation method of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of positive electrode sheet: LiCoO 2 (Lithium cobalt oxide), Super-P (conductive carbon black), PVDF (polyylidene fluoride resin) are mixed with NMP (N, N-dimethylpyrrolidone) in a mass ratio of 95:2:3 and stirred evenly to obtain a positive electrode Sheet Coating Slurry. Viscosity was adjusted by NMP during stirring. Then the slurry was uniformly coated on both sides of a 14 micron thick positive electrode current collector (aluminum foil) according to a certain width, and finally cold pressed and sliced ​​to obtain positive electrode sheets.

[0029] Preparation of the negative electrode sheet: MCMB (a kind of anode graphite, mesophase pitch-based carbon microspheres), Super-P (conductive carbon black), CMC (water-based binder, carboxymethyl cellulose), SBR ( Styrene Butadiene Rubber (a kind of rubber) is mixed with deionized water in a mass ratio of 94:1:2:3 and stirred evenly to obtain a negative electrode coating slurry. The viscosity was adjusted b...

Embodiment 2

[0032] Lithium-ion batteries were prepared according to the method described in Example 1. The difference was that the amount of electrolyte solution injected during the first liquid injection was 2.47 grams, and after standing for half an hour, it was charged with a current of 0.1C for 60 minutes for opening formation, and the charging capacity was 10% of the battery's rated capacity. Then add 0.19 grams of succinonitrile (SN) to 1.14 grams of the above-mentioned electrolyte and mix evenly, then inject the electrolyte containing the SN additive into the cell shell for the second injection, and quickly seal it to make a 053450 lithium-ion battery .

Embodiment 3

[0034] Lithium-ion batteries were prepared according to the method described in Example 1. The difference was that the amount of electrolyte solution injected during the first liquid injection was 3.23 grams, and after standing for half an hour, it was charged with a current of 1.5C for 3 minutes for opening formation, and the charging capacity was 8% of the battery's rated capacity. Then add 0.038 grams of ethylene sulfate (DTD) to 0.532 grams of the above electrolyte and mix evenly, then inject the electrolyte containing DTD additive into the cell shell for the second injection, and quickly seal it to make a 053450 lithium-ion battery .

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a formation method of a lithium ion battery. The formation method comprises the following steps of: vacuumizing a battery to be injected and performing first injection on the battery; performing opening formation on the battery subjected to the first injection, wherein a formation current ranges from 0.1C to 1.5C; and performing second injection and encapsulation on the battery subjected to the formation, wherein electrolyte for the second injection comprises high-temperature additives including at least one of trimethylene sulfite, ethylene sulfate, succinonitrile and adiponitrile. Compared with the prior art, the formation method disclosed by the invention avoids the electrolyte leakage caused by quick gas production during deformation with a large current by virtue of the way of twice injection, and avoids the influence on the components of an SEI (Solid Electrolyte Interface) membrane due to adding the electrolyte additives once, thereby improving the low temperature performance of a battery cell; and as the battery cell has high temperature performance by virtue of the additives injected after the formation, and the formation time is shortened greatly, the process efficiency is enhanced greatly, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-current formation method of lithium-ion batteries. Background technique [0002] Lithium-ion secondary battery, as a green battery, has the advantages of high working voltage, high specific energy and long cycle life. It has been developed rapidly in recent years. The application in is more and more extensive. The expansion of battery application fields and the increase in battery demand have prompted battery manufacturers to simplify the process flow, reduce process time to improve production efficiency to meet market requirements, and continuously improve the comprehensive electrochemical performance of batteries to meet application requirements. With the improvement of production mechanization in the battery industry, the formation process has become an important step that currently restricts the production efficiency of lithium-ion batteries....

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/44H01M10/0567
CPCY02E60/10Y02P70/50
Inventor 张小细赵丰刚张柏清袁庆丰
Owner NINGDE AMPEREX TECH
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