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Electrode slurry preparing method

A technology of electrode slurry and electrode active material, which is applied in the direction of electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of difficult and effective dispersion of conductive agents, fast capacity decay speed, poor battery capacity, etc., and achieve the discharge platform and cycle. Stable resistance, slow capacity fading speed, and increased specific capacity

Inactive Publication Date: 2008-02-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, carbon black, the electrode active material, is added to the binder solution and stirred. Due to the high viscosity of the solution and the high surface energy of the conductive agent due to its large specific surface area, the conductive agent is difficult to be effectively dispersed during the stirring and mixing process, so that it cannot It is uniformly and stably dispersed in the electrode slurry and electrode material, so the battery prepared by using the electrode slurry has the disadvantages of poor capacity development, fast capacity fading, unstable discharge platform and cycle internal resistance

Method used

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Examples

Experimental program
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preparation example Construction

[0019] According to a preferred embodiment of the present invention, the preparation method of electrode slurry of the present invention comprises the steps:

[0020] (1) Mix the conductive agent with the conductive agent dispersion medium, then wet the conductive agent through primary stirring, and then disperse the conductive agent evenly through secondary stirring, which also preferably includes removing conductive agent particles with a particle size exceeding 5000 nanometers or particle aggregates to obtain conductive agent dispersion;

[0021] (2) mixing the binder with the binder solvent, and stirring to make it uniformly dispersed to obtain a binder solution;

[0022] (3) Mix and stir the electrode active material with the conductive agent dispersion obtained in the above step (1), the binder solution obtained in the step (2) and an appropriate amount of solvent to obtain a uniform electrode slurry.

[0023] The mixing method of the electrode active material, the cond...

Embodiment 1

[0028]This example illustrates the preparation method of the electrode slurry provided by the present invention.

[0029] 1. Get 1.5 parts by weight of deionized water and 0.3 parts by weight of carbon black conductive agent (specific surface area 2200m 2 / g) mixing, firstly carry out primary stirring at a rate of 300 rpm, and the stirring time is 15 minutes; then carry out secondary stirring at a rate of 2200 rpm, and take a sample every 10 minutes during the stirring process , using a particle size analyzer (X100 laser particle size analyzer, Microtrac, USA) to measure with deionized water as the sample medium, until the D of the conductive agent particles 50 When the particle size is below 3000 nm, stop stirring, and pass the conductive agent dispersion through a 3000-mesh nylon sieve to remove conductive agent particles or particle aggregates with a particle size exceeding 5000 nm;

[0030] 2. Mix 5 parts by weight of deionized water with 1 part by weight of polyacrylamid...

Embodiment 2

[0033] This example is used to illustrate the preparation method of the electrode slurry of the present invention.

[0034] 1. Get 8 parts by weight of N-methyl-2-pyrrolidone and 1 part by weight of carbon black conductive agent (specific surface area 1800m 2 / g) mixing, firstly carry out primary stirring at a rate of 200 rpm, and the stirring time is 10 minutes; then carry out secondary stirring at a rate of 2000 rpm, and take a sample every 10 minutes during the stirring process , using a particle size analyzer (X100 laser particle size analyzer, Microtrac, USA) to measure with deionized water as the sample medium, until the D of the conductive agent particles 50 When the particle size is below 3000 nm, stop stirring, and pass the conductive agent dispersion through a 3000-mesh nylon sieve to remove conductive agent particles or particle aggregates with a particle size exceeding 5000 nm;

[0035] 2. Mix 21 parts by weight of N-methyl-2-pyrrolidone with 3 parts by weight of ...

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Abstract

This inventive electrode slurry comprising: binder, conductive agent, electrode active substance and solvent are mixed evenly by agitating. Said conductive agent in the form of conductive system is mixed with the binder, electrode active substance and solvent. Said conductive system comprises conducting agent and conductive dispersion medium, said conducting agent having D50 size of 200-3000 nanometer. The slurry thus prepared has advantages of: excellent electric capacity of electrode active substance, slow rate of decay of electric capacity, stable discharging platform, stable internal resistance.

Description

technical field [0001] The invention relates to a preparation method of an electrode slurry, in particular to a preparation method of an electrode slurry of a lithium ion secondary battery. Background technique [0002] While lithium-ion secondary batteries are widely used as energy sources for various electronic devices, people's requirements for battery performance are getting higher and higher, whether it is a circular lithium-ion secondary battery with high capacity or a The square lithium-ion secondary batteries of electronic products are required to have a high capacity due to the consideration of the service life, and these batteries are also required to have a good capacity retention rate in the repeated charge and discharge process, showing good performance. Cycle performance, with a long service life. [0003] For increasing the battery capacity, there are usually two methods: one is to increase the specific capacity of the electrode active material, and the other...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M4/58H01M4/48
CPCY02E60/12Y02E60/10
Inventor 吴声本
Owner BYD CO LTD
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