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Conductive agent dispersion liquid, electrode slurry, electrode, battery, and preparation methods thereof

A technology of electrode slurry and conductive agent, applied in battery electrodes, electrode manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems such as uneven dispersion of conductive agents

Inactive Publication Date: 2010-06-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the purpose of the present invention is in order to overcome the shortcoming that the conductive agent in the prior art is dispersed inhomogeneously in the dispersion liquid, provide a kind of conductive agent dispersion liquid and its preparation method that the conductive agent can be uniformly dispersed therein

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  • Conductive agent dispersion liquid, electrode slurry, electrode, battery, and preparation methods thereof
  • Conductive agent dispersion liquid, electrode slurry, electrode, battery, and preparation methods thereof
  • Conductive agent dispersion liquid, electrode slurry, electrode, battery, and preparation methods thereof

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preparation example Construction

[0026] According to the preparation method of the conductive agent dispersion liquid of the present invention, the method comprises dispersing the conductive agent into a dispersing agent solution under ultrasonic vibration, the dispersing agent solution contains a dispersing agent and a first solvent, and the dispersing agent is an aromatic A substance that is cyclic and can be combined with the surface of the conductive agent by intermolecular van der Waals force and inter-plane π-π force, the solubility of the dispersant in the first solvent at 25 ° C is not less than 10% by weight, preferably not less than 10% by weight. Below 30% by weight, more preferably 30-80% by weight. Preferably, the weight ratio of the conductive agent, the first solvent and the dispersing agent is 3:(15-35):(0.6-6), preferably 3:(24-28):(2.4-3). In the conductive agent dispersion prepared according to the method, the particle diameter of the conductive agent is 2-4 microns, preferably 2-3 microns,...

Embodiment 1

[0043] This example illustrates the conductive agent dispersion and the preparation method thereof according to the present invention.

[0044]60 grams of polyvinylpyrrolidone (purchased from Dima Technology, PVPR22K, weight average molecular weight 22100) was dissolved in 150 grams of N,N-dimethylformamide, and then 30 grams of acetylene black (particle diameter 50 Nano) was dispersed into the obtained solution under ultrasonic vibration, using a Lucky ultrasonic disperser of Shanghai Shengyan Ultrasonic Instrument Co., Ltd., the frequency of the ultrasonic wave was 150 kHz, and the dispersion time was 90 minutes, using a QXD of Tianjin Jingke Material Testing Machine. The particle size of the conductive agent in the obtained slurry measured by a scraper fineness meter of a model is 2-4 microns. After the resulting slurry was allowed to stand for 24 hours, the particle size of the conductive agent was measured according to the above method to be 4-5 microns.

Embodiment 2

[0048] This example illustrates electrode pastes and electrodes according to the present invention and methods for their preparation.

[0049] First, 15 grams of polyvinylidene fluoride was dissolved in 135 grams of N-methylpyrrolidone to make a binder solution, and then 30 grams of naphthol polyoxyethylene ether (purchased from ICI, UK, S-27000, heavy The average molecular weight is 27000) is dissolved in 100 grams of N-methylpyrrolidone, then the two solutions are completely mixed, and then 30 grams of conductive carbon black are dispersed in the resulting mixed solution under ultrasonic vibration. The ultrasonic dispersing machine of the Lucky model of Ultrasonic Instrument Co., Ltd., the frequency of ultrasonic waves is 120 kHz, and the dispersion time is 120 minutes. Then add 1000 g of LiCoO to this conductive agent dispersion 2 , mixed with a planetary mixer, the Hongyun double planetary mixer of Guangzhou Hongyun Machinery Factory, to obtain a positive electrode slurry...

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Abstract

The invention discloses a conductive agent dispersion liquid and a preparation method thereof. The conductive agent dispersion liquid contains a conductive agent, a solvent and a dispersion agent, wherein the dispersion agent contains aromatic rings and can be bound with the surface of the conductive agent by Van der Waals force among molecules and pi-pi action force between planes; and the solubility in the first solvent at the temperature of 25 DEG C is not smaller than 10wt%. The invention also discloses an electrode slurry and a preparation method thereof, and a battery electrode prepared from the electrode slurry and a battery. As using the matter which contains the aromatic rings and can be bound with the surface of the conductive agent by Van der Waals force among molecules and pi-pi action force between planes as the dispersion agent of the conductive agent, the battery capacitance, the charging and discharging capacitance and the rate discharge property are effectively enhanced.

Description

technical field [0001] The present invention relates to a conductive agent dispersion liquid and a preparation method of the conductive agent dispersion liquid. The present invention also relates to an electrode slurry containing the above conductive agent dispersion liquid and a preparation method thereof, as well as a battery electrode prepared by using the electrode slurry and comprising: The battery electrode of the battery. Background technique [0002] Due to the advantages of high specific energy, high operating voltage, light weight, small self-discharge, long cycle life, stable discharge performance, no memory effect, and low environmental pollution, lithium-ion batteries are now widely used in mobile phones, notebook computers and other portable communications. and electronics. [0003] As lithium-nickel-cobalt oxide (LiNiCoO) as a cathode material for lithium-ion batteries 2 ), lithium cobalt oxide (LiCoO) 2 ), lithium manganese oxide (LiMn) 2 O 4 ) and lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/02H01M4/62H01B1/20
CPCY02E60/12Y02E60/10
Inventor 李志刁家喜盛爱萍
Owner BYD CO LTD
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