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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: 2012-09-26
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

Method used

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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

Examples

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preparation example Construction

[0026] According to the preparation method of the conductive agent dispersion liquid of the present invention, wherein, the method comprises that the conductive agent is dispersed into the dispersant solution under ultrasonic vibration, the dispersant solution contains the dispersant and the first solvent, and the dispersant contains aromatic A substance that is cyclic and can be combined with the surface of the conductive agent by intermolecular van der Waals force and interplane 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 30% by weight, more preferably 30-80% by weight. Preferably, the weight ratio of the conductive agent, the first solvent and the dispersant 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, which is far smaller than th...

Embodiment 1

[0043] This example illustrates the conductive agent dispersion and its preparation method 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 before adding Nano) is dispersed in the solution that obtains under ultrasonic vibration, uses the ultrasonic disperser of the Lucky model of Shanghai Shengyan Ultrasonic Instrument Co., Ltd., the frequency of ultrasonic is 150kHz, and the dispersion time is 90 minutes, with the QXD of Tianjin Jingke Material Testing Machine The particle size of the conductive agent in the obtained slurry measured by a model scraper fineness meter is 2-4 microns. After the obtained slurry was left to stand for 24 hours, the particle size of the conductive agent was determined to be 4-5 microns according to the above method.

Embodiment 2

[0048] This example illustrates electrode pastes and electrodes according to the 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 British ICI company, S-27000, weight The average molecular weight is 27000) is dissolved in 100 grams of N-methylpyrrolidone, then these two solutions are completely mixed, and then 30 grams of conductive carbon black is dispersed into the resulting mixed solution under ultrasonic vibration, using Shanghai Shengyan Ultrasonic dispersing machine of Lucky type from Ultrasonic Instrument Co., Ltd., the ultrasonic frequency is 120 kHz, and the dispersion time is 120 minutes. According to the method of Example 1, the particle size of the conductive agent in the conductive slurry is 2-3 microns. Then add 1000 g of LiCoO to this conductive agent dispersion 2 , mixed...

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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 preparedfrom 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 kind of conductive agent dispersion liquid and the preparation method of the conductive agent dispersion liquid, and the present invention also relates to the electrode slurry containing the above-mentioned conductive agent dispersion liquid and its preparation method and the battery electrode and the battery electrode made by using the electrode slurry The battery electrodes of the battery. Background technique [0002] Lithium-ion batteries have been widely used in portable communications such as mobile phones and notebook computers due to their advantages such as high specific energy, high working voltage, light weight, small self-discharge, long cycle life, stable discharge performance, no memory effect, and low environmental pollution. and electronic products. [0003] Lithium nickel cobalt oxide (LiNiCoO 2 ), lithium cobalt oxide (LiCoO 2 ), lithium manganese oxide (LiMn 2 o 4 ) and lithium iron phosphorus ...

Claims

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Application Information

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Patent Type & Authority Patents(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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