Preparation method of negative electrode slurry for 3D printing

A negative electrode slurry, 3D printing technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of long research cycle, high mold opening cost, unfavorable new product development, etc. Qualification rate and performance, the effect of improving fluency

Inactive Publication Date: 2021-02-19
GUIZHOU MEILING POWER SUPPLY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional special-shaped batteries all use the mold cutting method, and it is necessary to design a cutting mold that satisfies the shape of the space. Therefore, the research cycle is long and the cost of mold opening is high, which is not conducive to the development of new products.
Therefore, it is the general trend to introduce customized 3D printing into the production of special-shaped batteries, but the characteristics of the slurry required for 3D printing are different from those of general lithium-ion production slurry, because the viscosity of the slurry required for 3D printing is high and requires slurry mixing. Uniform and no agglomeration, so the use of solvent binder and stirring process are particularly important. In view of this, there is currently no negative electrode slurry specially used for 3D printing

Method used

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  • Preparation method of negative electrode slurry for 3D printing
  • Preparation method of negative electrode slurry for 3D printing
  • Preparation method of negative electrode slurry for 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 2.5g sodium carboxymethylcellulose (CMC) into 100g deionized water, dissolve with ultrasonic vibration for 10min, and obtain solution A. Weigh 1.6g of superconducting carbon black and 1.6g of carbon nanotubes into solution A, and use a planetary disperser at 1200r / min for 2min, 1800r / min for 1min, and 1200r / min for 2min to obtain solution B. Weigh 50g of silicon carbon material into solution B, use a planetary disperser at 1200r / min for 2min, 1800r / min for 1min, and 1200r / min for 2min to obtain solution C; weigh 3.75g of styrene-butadiene rubber (SBR) into solution C , using a planetary disperser at 1200r / min for 2min, 1800r / min for 1min, 1200r / min for 2min, the viscosity of the slurry is 800-1500cps, and passed through a 200-mesh sieve to obtain 3D printed negative electrode slurry.

Embodiment 2

[0030] Weigh 1.7 g of sodium carboxymethylcellulose (CMC) and add it into 100 g of deionized water, and dissolve it by ultrasonic vibration for 8 min to obtain solution A. Weigh 0.6g of superconducting carbon black and 0.8g of carbon nanotubes into solution A, and use a planetary disperser at 1200r / min for 1min, 1800r / min for 1min, and 1200r / min for 1min to obtain solution B. Weigh 50g of silicon carbon material into solution B, use a planetary disperser at 400r / min for 5min, 800r / min for 20min, 1800r / min for 2min, 800r / min for 20min, and 400r / min for 5min to obtain solution C; Take 2.5g of styrene-butadiene rubber (SBR) and add it to solution C, use a planetary disperser to turn it at 800r / min for 15min, turn it at 1800r / min for 2min, and turn it at 800r / min for 15min, the viscosity of the slurry is 500-1200cps, pass through a 150-mesh sieve, and get 3D printed negative electrode paste.

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Abstract

The invention discloses a preparation method of negative electrode slurry for 3D printing in the field of chemical energy storage batteries, which comprises the following steps: weighing carboxymethylcellulose (CMC), putting the CMC into water, carrying out ultrasonic oscillation dissolution, adding a silicon-carbon material, a conductive agent and SBR, and uniformly mixing by using a planetary dispersion machine to obtain 3D printing slurry. The negative electrode slurry provided by the invention can be directly used for direct-writing 3D printing, manufacturing a preformed pole piece and then drying to obtain the pole piece, and the preparation method is simple, and due to short preparation time, agglomeration and mixing can be reduced, so that the negative electrode slurry is more uniform, the printing fluency is improved, and the performance of the pole piece is more excellent.

Description

technical field [0001] The invention relates to the field of chemical energy storage batteries, in particular to a method for preparing negative electrode slurry that can be used for 3D printing. Background technique [0002] In recent years, with the continuous development and progress of science and technology, along with the rapid development of various portable electronic devices, electric vehicles and military weapons and equipment, the requirements for chemical power sources have become higher and higher, and chemical power sources are required to have higher energy density. In weaponry, the space reserved for power supply is generally irregular. If lithium-ion batteries (usually rectangular and cylindrical) commonly used in the current electronic field are used, the space utilization rate is not high, resulting in low specific energy of the battery system. Improving the space utilization rate is an important means to increase the specific energy of the battery system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525
CPCH01M4/1395H01M4/362H01M4/386H01M4/62H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 张亮唐月娇李坚石斌鲁中良苟敏涛陈晓涛刘富亮
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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