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Lithium ion battery, cathode slurry and preparation method thereof

A lithium-ion battery and negative electrode slurry technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable active substances mixed with glue, normal production impact, equipment alarms, etc., to shorten the preparation time and shorten the Wetting time, the effect of improving production efficiency

Active Publication Date: 2012-03-14
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CMC has a high viscosity, which is not conducive to the mixing of active substances and glue. In severe cases, even semi-dry materials will adhere to the stirring paddle of the mixer. The resistance of the stirring paddle is greater than the stirring force that the mixer can provide, causing the equipment to alarm. Normal big impact on production

Method used

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  • Lithium ion battery, cathode slurry and preparation method thereof
  • Lithium ion battery, cathode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A negative electrode slurry for a lithium ion battery is prepared, and the process includes the following steps.

[0023] (101) Mix 2000 g of negative active material natural graphite and 50 g of negative conductive agent carbon black in a stirred tank, add lubricant methanol 15 g, and stir for 5 to 40 minutes until uniformly mixed;

[0024] (102) The additive sodium carboxymethylcellulose CMC30g is added in the stirrer and stirred;

[0025] (103) Mix 2000 g of negative electrode solvent deionized water and 60 g of negative electrode binder SBR to make a rubber compound, add the material in the above-mentioned agitator to the rubber compound, and mix and stir for 8 hours to make a negative electrode slurry.

Embodiment 2

[0027] A negative electrode slurry for a lithium ion battery is prepared, and the process includes the following steps.

[0028] (201) 2000 g of natural graphite, a negative electrode active material, and 50 g of negative electrode conductive agent carbon black are mixed in a stirred tank, and a total of 200 g of lubricant nitrogen methyl pyrrolidone NMP and acetone are added, and stirred for 5 to 40 minutes until uniformly mixed;

[0029] (202) The additive sodium carboxymethylcellulose CMC30g is added in the stirrer and stirred;

[0030] (203) Mix 2000 g of negative electrode solvent deionized water and 60 g of negative electrode binder SBR to make a rubber compound, add the material in the above-mentioned agitator to the rubber compound, and mix and stir for 7.5 hours to make a negative electrode slurry.

Embodiment 3

[0032] A negative electrode slurry for a lithium ion battery is prepared, and the process includes the following steps.

[0033] (301) 2000g of natural graphite, the negative electrode active material, and 50g of the negative electrode conductive agent, carbon black, are mixed in a stirred tank, and a total of 600g of lubricant methanol and ethanol are added, stirred for 5 to 40 minutes until uniformly mixed;

[0034] (302) The additive sodium carboxymethyl cellulose CMC30g is added in the stirrer and stirred;

[0035] (303) Mix 2000 g of negative electrode solvent distilled water and 60 g of negative electrode binder SBR to make a rubber compound, add the material in the above-mentioned agitator to the rubber compound, and mix and stir for 7 hours to make a negative electrode slurry.

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PUM

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Abstract

The invention discloses a lithium ion battery, cathode slurry and a preparation method. The method comprises the following steps: (1) a cathode active substance and a cathode conductive agent are mixed in a stirrer, and then a lubricant is added for uniformly stirring; (2) an additive sodium carboxymethylcellulose CMC is added in the stirrer for stirring; (3) the substance in the stirrer is added in a mixed sizing material which is composed of cathode solvent water and cathode binder, uniformly mixed and stirred to prepare the cathode slurry. The lubricant is alcohol, ketone, or a mixture of alcohol and ketone. The invention employs a combination of a wetting agent, graphite and the conductive agent, thereby the wetting time can be effectively shortened, the preparation time of the slurry is shortened, and the uniformity and stability of the cathode slurry are enhanced.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a negative electrode slurry of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries were introduced to the market by Sony Corporation of Japan in the 1990s. Because of their high operating voltage, high energy density, and long cycle life, they are widely used in mobile phones, laptops and other small mobile power fields. With the further improvement of the energy density and power density of lithium-ion batteries, it has been regarded as an ideal power source for hybrid electric vehicles and electric vehicles, and it is a type of energy storage device with broad application prospects. [0003] The first process of the lithium-ion battery preparation process is homogenization, which is to mix the active material with solvent, conductive agent, binder, etc. to obtain a slurry with a certain viscosity and solid ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/62H01M10/0525
CPCY02E60/10
Inventor 陈邦义
Owner SHENZHEN BAK POWER BATTERY CO LTD
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