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High-safety lithium ion battery cathode paste and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems that cannot meet the safety performance and consistency requirements of lithium-ion batteries, and achieve shortened stirring time, reduce internal gas production, good safety performance

Inactive Publication Date: 2016-04-20
先进储能材料国家工程研究中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition and preparation method of this positive electrode slurry obviously cannot meet the safety performance and consistency requirements of lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 46.5kg lithium cobaltate, 46.5kg lithium nickel cobalt aluminate, 1kg polyvinylidene fluoride PVDF, 1.5kg conductive carbon black SP, 0.5kg conductive graphite KS-6, 3kg lithium carbonate, 0.5kg acrylic acid-propylene The copolymer of nitrile (molecular weight is 1,300,000), mixes after sieving respectively, adds in stirring device and stirs 30min, and the rotating speed of stirring shaft is 100rpm, and the rotating speed of stirring container is 20rpm;

[0025] (2) add 67% N-methylpyrrolidone NMP, set the rotating speed of the stirring shaft to be 400rpm, the rotating speed of the stirring container is 30rpm, scrape the material after stirring for 20min; change the rotating speed of the stirring shaft to 1000rpm, and the rotating speed of the stirring container is 40rpm, Stir again for 20 minutes and then scrape the material; change the rotating speed of the stirring shaft to 1500 rpm, the rotating speed of the stirring container to 50 rpm, and scrape the mate...

Embodiment 2

[0030] (1) Weigh 92kg lithium nickel cobalt aluminate, 0.5kg polyvinylidene fluoride PVDF, 1kg conductive carbon black SP, 0.5kg conductive graphite SFG-6, 5kg lithium carbonate, 1kg acrylic acid-acrylonitrile copolymer (molecular weight is 200 10,000), respectively sieved and mixed, added to the stirring device and stirred for 30min, the rotating speed of the stirring shaft was 100rpm, and the rotating speed of the stirring container was 20rpm;

[0031] (2) add 55% N-methylpyrrolidone NMP, set the rotating speed of the stirring shaft to be 400rpm, the rotating speed of the stirring container is 30rpm, scrape the material after stirring for 50min; change the rotating speed of the stirring shaft to 1500rpm, and the rotating speed of the stirring container is 50rpm, Stir again for 30 minutes and then scrape the material;

[0032] (3) Add 35% N-methylpyrrolidone NMP, set the rotating speed of the stirring shaft to 1800 rpm, the rotating speed of the stirring container to 50 rpm, ...

Embodiment 3

[0036] (1) Weigh 60kg nickel-cobalt lithium aluminate, 30kg nickel-cobalt lithium manganate, 0.3kg polyvinylidene fluoride PVDF, 2kg conductive carbon black SP, 0.5kg carbon nanotube CNT, 6kg lithium carbonate, 1.2kg acrylic acid-propylene The copolymer of nitrile (molecular weight is 2,000,000), mixes after sieving respectively, adds in stirring device and stirs 30min, and the rotating speed of stirring shaft is 100rpm, and the rotating speed of stirring vessel is 20rpm;

[0037] (2) add 60% N-methylpyrrolidone NMP, set the rotating speed of the stirring shaft to be 400rpm, the rotating speed of the stirring container is 30rpm, scrape after stirring for 30min; change the rotating speed of the stirring shaft to 1000rpm, and the rotating speed of the stirring container is 40rpm, Stir again for 20 minutes before scraping; change the rotating speed of the stirring shaft to 1500 rpm, and the rotating speed of the stirring container to 50 rpm, and stir again for 40 minutes before sc...

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Abstract

The invention provides a high-safety lithium ion battery cathode paste and a preparation method thereof. The high-safety lithium ion battery anode paste comprises 80-99 parts of positive active materials, 0.2-10 parts of a binder, 0.5-5 parts of a conductive agent and 0.3-10 parts of a positive additive, wherein the positive additive is lithium carbonate; the binder is one or two of a acrylic acid acrylonitrile copolymer and polyvinylidene fluoride (PVDF). According to the high-safety lithium ion battery cathode paste and the preparation method thereof, as analytically pure lithium carbonate is added to react with alkali and water remained in a battery, internally produced gas is reduced, and the battery safety is improved; besides, with the adoption of the improved dry high-viscosity mixing technology, the stirring time of the paste is obviously shortened, the production efficiency is improved, the dispersing effect of the paste is enhanced, the quality of the paste is improved, and the safety performance of lithium ion batteries is further improved.

Description

technical field [0001] The invention relates to a lithium ion battery slurry and a preparation method thereof, in particular to a high-safety lithium ion battery positive electrode slurry and a preparation method thereof. Background technique [0002] As we all know, since 1991, SONY launched LiCoO 2 Since the commercial lithium secondary battery with carbon as the positive electrode and carbon as the negative electrode has developed rapidly because of its high specific energy, long cycle life, no memory effect, wide operating temperature range, etc., it has been used in portable electronic devices, especially mobile phones, cameras and Laptops and other aspects show broad application prospects, and gradually expand to high-power systems such as electric vehicles, defense industry, high-efficiency energy storage systems and satellites. [0003] However, in recent years, there have been frequent reports of fires and even explosions caused by lithium-ion batteries, and the sa...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCH01M4/505H01M4/525H01M4/622H01M4/623H01M10/0525H01M10/4235Y02E60/10
Inventor 伍文彭争钟发平张洪涛
Owner 先进储能材料国家工程研究中心有限责任公司
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