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Lithium ion battery negative slurry and lithium ion battery

A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of poor battery performance consistency, poor battery quality consistency, poor storage stability, etc. The effect of improving stability, normal temperature cycle performance and high temperature cycle performance, and stable storage performance

Inactive Publication Date: 2011-01-05
SHANGHAI BYD
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AI Technical Summary

Problems solved by technology

[0002] In the industrial production process of lithium-ion batteries, in order to meet the needs of mass production, the electrode slurry generally needs to stay on the production line for a long time (usually about 12 hours) after preparation. Therefore, there are certain requirements for the stability of the slurry , otherwise, the consistency of battery quality is poor
[0003] However, in the actual production process, the stability of the electrode slurry, especially the negative electrode slurry, often deteriorates when stored for a long time, and sedimentation and agglomeration occur, which makes the performance consistency of the battery worse and affects product quality.

Method used

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  • Lithium ion battery negative slurry and lithium ion battery
  • Lithium ion battery negative slurry and lithium ion battery
  • Lithium ion battery negative slurry and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of negative electrode sheet for lithium ion battery:

[0020] 5,000 grams of artificial graphite, 90 grams of CMC with a weight-average molecular weight of 400,000, 90 grams of SBR, 4,500 grams of deionized water, and 4.5 grams of phenol were mixed and stirred to obtain a negative electrode slurry A1.

[0021] The negative electrode slurry A1 obtained in the previous step was coated on a copper foil with a thickness of 8um with a slurry machine, dried at 90°C, pressed into sheets, and then cut into negative sheets with a length×width×thickness=479mm×43.5mm×0.13mm , each negative sheet contains 2.95 grams of artificial graphite.

[0022] Preparation of positive electrode sheet for lithium ion battery: 5000 grams of lithium cobalt oxide, 75 grams of PVDF binder with a weight average molecular weight of 700,000, 150 grams of conductive agent carbon powder, 1500 grams of NMP, mixed and stirred to obtain a positive electrode slurry.

[0023] 2. Coat the posit...

Embodiment 2

[0026] 5000 grams of artificial graphite, 90 grams of CMC with a weight average molecular weight of 400,000, 90 grams of SBR, 4500 grams of deionized water, and 450 grams of phenol are mixed and stirred evenly to obtain negative electrode slurry A2. Others are the same as in Example 1.

Embodiment 3

[0028] 5000 grams of artificial graphite, 90 grams of CMC with a weight-average molecular weight of 400,000, 90 grams of SBR, 4500 grams of deionized water, and 0.45 grams of phenol were mixed and stirred to obtain a negative electrode slurry A3. Others are the same as in Example 1.

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Abstract

The invention relates to lithium ion battery negative slurry ad a lithium ion battery using the negative slurry, belonging to the field of lithium ion batteries. The invention adopts the technical scheme of adding a preservative capable of inhibiting the biodegradation of cellulose ether to the negative slurry, so that the technical problems of poor performance and performance consistence of the manufactured battery because the negative slurry has agglomeration and sedimentation after staying long time on the production line to reduce stability in industrial production are solved. The normal temperature cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode slurry and a lithium ion battery using the slurry. Background technique [0002] In the industrial production process of lithium-ion batteries, in order to meet the needs of mass production, the electrode slurry generally needs to stay on the production line for a long time (usually about 12 hours) after it is prepared. Therefore, there are certain requirements for the stability of the slurry. , otherwise, the consistency of the battery quality is poor. [0003] However, in the actual production process, the electrode slurry, especially the negative electrode slurry, is often stored for a long time due to the deterioration of the stability, and the phenomenon of sedimentation and agglomeration occurs, so that the performance consistency of the battery is deteriorated and the product quality is affected. SUMMARY OF THE INVENTION [0004] In order to solve the technical problem that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62H01M10/36H01M10/40
CPCY02E60/10
Inventor 李海彦徐海英王涌雷磊
Owner SHANGHAI BYD
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