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Production of lithium ion battery cathode binder and cathode chip

A lithium-ion battery and a manufacturing method technology, applied in the field of material chemistry, can solve the problems of inability to meet high-capacity batteries, poor battery cycle performance, and can not be too high in area density, achieve excellent quality, improve cycle performance and electrochemical performance, The effect of improving the bonding performance

Active Publication Date: 2006-11-01
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, in large-scale production, the manufacture of negative electrodes has adopted water-phase coating technology, such as using water as a solvent, using sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) latex as water-based binders, but The negative electrode pole piece that this kind of water-based adhesive is made has following deficiencies: 1) surface density can not be too high, can not meet the requirement of high-capacity battery; not good

Method used

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  • Production of lithium ion battery cathode binder and cathode chip
  • Production of lithium ion battery cathode binder and cathode chip
  • Production of lithium ion battery cathode binder and cathode chip

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1. Graphite is used as the negative electrode active material, and the mixture of CMC and SBR is used as the water-based binder. The proportion by weight is graphite: conductive agent: gelatin: CMC: SBR = 100: 2: 0.5: 2.5: 0.5.

[0023] First, 5g of gelatin is dissolved in 50ml of pure water to obtain a gelatin solution, then 25g of CMC is completely dissolved in 1250ml of pure water, and the prepared 1250ml of CMC solution and 1000g of dry graphite (manufactured by Changsha Xingcheng Graphite) are poured into a small egg beater. Stir at 2000 rpm for half an hour, then add 20g of conductive agent Super P to the above mixture in 3 batches, continue to stir at high speed for 2 hours, after the slurry is roughly mixed, add 5 grams of SBR and prepared gelatin solution, and stir for 3 hour, the slurry preparation is complete. Vacuum in a vacuum drying oven for 1 hour, and then pass through a 500-mesh sieve before coating.

Embodiment 2

[0024] Embodiment 2, graphite is used as the negative electrode active material, and the mixture of CMC and PTFE is the water-based binder, and the proportion by weight is graphite: conductive agent: gelatin: CMC: PTFE=100: 2: 2.0: 0.5: 2.0.

[0025] First, 20g of gelatin is dissolved in 200ml of pure water to obtain a gelatin solution, then 5g of CMC is completely dissolved in 1100ml of pure water, and the prepared 1100ml of CMC solution and 1000g of dry graphite (manufactured by Changsha Xingcheng Graphite) are poured into a small egg beater. Stir at 2000 rpm for half an hour, then add conductive agent Super P20g to the above mixture in 3 batches, continue to stir at high speed for 2 hours, after the slurry is roughly mixed, add 20 grams of PTFE and prepared gelatin solution, and stir for 3 hour, the slurry preparation is complete. Vacuum in a vacuum drying oven for 1 hour, and then pass through a 500-mesh sieve before coating.

Embodiment 3

[0026] Embodiment three, take graphite as negative electrode active material, CMC and acrylonitrile-butadiene latex mixture are water-based binder, by weight, graphite: conductive agent: gelatin: CMC: acrylonitrile-butadiene latex=100: 2:1.5:1.0:4.0 ingredients.

[0027] First, 15g of gelatin is dissolved in 200ml of pure water to obtain a gelatin solution, then 10g of CMC is completely dissolved in 1100ml of pure water, and the prepared 1100ml of CMC solution and 1000g of dry graphite (manufactured by Changsha Xingcheng Graphite) are poured into a small egg beater to Stir at 2000 rpm for half an hour, then add 20g of conductive agent Super P to the above mixture in 3 batches, continue stirring at high speed for 2 hours, after the slurry is roughly mixed, add 40g of acrylonitrile-butadiene latex and mix well The gelatin solution was stirred for another 3 hours, and then the preparation of the slurry was completed. Vacuum in a vacuum drying oven for 1 hour, and then pass throu...

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Abstract

A lithium-ion battery negative binder and its production of negative wafer are disclosed. The binder consists of carboxymethylcellulose sodium, latex and gelatin. The process is carried out by mixing negative active material grain with conductive agent and binder to make them into and adding into gelatin. It has excellent binding and dispersing performances, high density and capacity, and better circulating and electrochemical properties.

Description

【Technical field】 [0001] The invention relates to the field of material chemistry and high-energy battery technology, in particular to a lithium ion battery negative electrode adhesive and a negative electrode sheet manufacturing method. 【Background technique】 [0002] Lithium-ion battery is a high-performance secondary battery, which has the advantages of high working voltage, high volume and weight energy density, long life, low self-discharge rate, no memory effect and good for the environment. It is widely used in mobile communication equipment, Notebook computers, camcorders, PDAs (personal digital assistants), digital cameras, power tools, torpedoes, missiles and other fields. In recent years, the lithium-ion battery manufacturing technology has made great progress, which has increased the capacity of the cylindrical battery of the model 18650 from the initial 1200mAh to the current 2400mAh. However, as far as the manufacturing method of battery pole pieces (positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J101/26C09J109/00C09J127/18C09J189/00H01M10/04
CPCY02E60/10Y02P70/50
Inventor 林云青陈泽伟李龙任灿高旭
Owner SHENZHEN BAK POWER BATTERY CO LTD
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