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Anode slarry prepn. process of Li ion cell, anode sheet and Li ion cell

A lithium-ion battery and positive electrode slurry technology, applied in the field of material chemistry, can solve problems such as easy delamination, poor slurry stability, and poor slurry uniformity

Inactive Publication Date: 2006-09-20
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process has the following disadvantages: 1) the uniformity of the slurry is not good; 2) the stability of the slurry is not good, and the slurry is easily delaminated after being placed for a period of time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The invention provides a method for preparing lithium-ion battery cathode slurry, comprising the following steps:

[0019] 1) Mix the weighed positive electrode materials. The positive electrode material refers to various raw materials required for preparing the positive electrode slurry of lithium ion batteries, including positive electrode active materials, conductive agents, binders and the like. In this step, it is preferable to use a grinding and pulverizing machine, such as a ball mill, to mix the positive electrode material, so that the positive electrode material can be ground to a certain fineness while achieving the purpose of mixing, and the quality of the prepared slurry can be improved. When a ball mill is selected for material mixing, the preferred process parameters are: ball mill frequency 30-70 Hz, ball-to-material ratio 1:2-1:1.5, and milling time 1.5-4 hours. In this process, the ball-to-material ratio should not be too low or too high, if the ball-t...

Embodiment 1

[0026] Take 10Kg of Ruixiang 757 lithium cobalt and conductive agent, binder mixed, Ruixiang lithium cobalt: conductive agent: binder = 100: 2.5: 3.5 (mass ratio), then the mixed material is ball milled, ball milled The frequency is 30Hz, the ball-to-material ratio is 1:1.5, and the ball milling time is 1.5 hours. Pour the ground material into the mixer, the solvent N-methylpyrrolidone (NMP) is added in two times, first add 2.1 kg, the revolution speed of the agitator is 10Hz, stir for 1.5 hours and then add 1.23 kg of solvent, the revolution speed of the agitator is 10 Hz. is 35Hz, the rotation speed is 35Hz, and the stirring time is 6 hours. The measured average viscosity was 4203mPa.s, and after 24 hours of sedimentation, the average viscosity was measured to be 6567mPa.s, with a difference of 2363mPa.s.

Embodiment 2

[0028] Take 10Kg of Ruixiang 757 lithium cobalt and conductive agent, binder mixed, Ruixiang lithium cobalt: conductive agent: binder = 100: 2.5: 3.5 (mass ratio), then the mixed material is ball milled, ball milled The frequency is 70Hz, the ball-to-material ratio is 1:2, and the ball milling time is 4 hours. Pour the ground material into the mixer, add the solvent NMP in four times, first add 0.5 kg, the revolution speed of the agitator is 10Hz, stir for 1 hour, add 2 kg of solvent, the revolution speed of the agitator is 35Hz, and the stirring time is 1.5 hours , then add 0.5 kg of solvent, the revolution speed of the agitator is 35 Hz, and the rotation speed is 38 Hz, after stirring for 3 hours, add 0.5 kg of solvent and continue stirring for 1.5 hours. The measured average viscosity was 3520mPa.s, and after 24 hours of sedimentation, the average viscosity was measured to be 4800mPa.s, with a difference of 1280mPa.s.

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Abstract

The method includes following steps: mixing weighed materiel of positive pole; adding solvent into mixed materiel of positive pole, and mixing the admixture round evenly so as to produce pulp of positive pole; carrying out at least twice to add solvent. Useful effect of the method is: batchwise method to add solvent prevents disadvantages of adding solvent only once that even mixed pulp can not be obtained even mixing admixture round for long time. The method reaches effect of getting twice the result with half the effort. The prepared pulp possesses favorable stability, and pulp does not be demixed after pulp is laid for 24 hours.

Description

【Technical field】 [0001] The invention relates to the field of material chemistry and high-energy battery technology, in particular to a preparation method of a positive electrode slurry of a lithium ion battery, a positive electrode sheet and a lithium ion battery. 【Background technique】 [0002] Since the concept of "rocking chair battery" (RCB) was proposed in 1980, Japan's Sony Corporation and Sanyo Corporation began practical research on lithium-ion secondary batteries in 1985 and 1988, respectively. With outstanding features such as large specific energy, small self-discharge, wide application temperature range, stable working voltage, and long storage life, all countries in the world are paying attention to the application of lithium-ion secondary batteries in the field of communications, portable electronic products, electric vehicles, and aerospace. The applications showed great interest and enthusiasm, and the performance and manufacturing process of lithium-ion se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/40H01M10/38H01M4/13H01M4/139H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 黄加军张志文邵戈
Owner ZHENGZHOU BAK BATTERY CO LTD