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Preparation method of negative electrode slurry

A negative electrode slurry and glue technology, which is applied in the field of negative electrode slurry preparation, can solve the problems of high pulping efficiency and slurry stability, improve coating appearance and uniformity of coating thickness, reduce agglomeration, and improve dispersibility Effect

Active Publication Date: 2020-07-03
TIANJIN ENERGIES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current technology, it is difficult to meet the requirements of high pulping efficiency, high slurry stability, and dispersion effect at the same time. Therefore, according to the current situation of materials and equipment of the enterprise, it is very important to develop a high-efficiency lithium ion negative electrode slurry preparation method. important

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  • Preparation method of negative electrode slurry

Examples

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preparation example Construction

[0042] Such as figure 1 Shown, a kind of preparation method of negative electrode slurry comprises the steps:

[0043] (1) Preparation of glue solution: Divide the deionized water into three parts, namely: a large part of deionized water, a small part of deionized water and the remaining deionized water. Mix 90-94% multi-part deionized water, first stir at a revolution speed of 10-15rpm for 5-10min, then stir for 100-150min at a revolution speed of 15-20rpm and an autorotation speed of 900-1100rpm, and prepare Take the glue, the solid content of the glue is 1.5-2.0%;

[0044] (2) Glue curing: the glue in the step (1) is left to stand for 22-26h to obtain the cured first adhesive glue;

[0045] (3) Dry powder mixing: mix the active material with the first conductive agent, first stir at a revolution speed of 10-15rpm for 5-10min, and then stir at a revolution speed of 20-25rpm for 20-40min to obtain a dry powder mixture, mixing the first conductive agent with the active mate...

Embodiment 1

[0052] A preparation method of negative electrode slurry, comprising the steps of:

[0053] (1) Preparation of glue: mix CMC with 92% deionized water at a temperature of 30°C, first stir for 5 minutes at a revolution speed of 10 rpm, and then stir for 120 minutes at a revolution speed of 20 rpm and an autorotation speed of 1000 rpm , to prepare glue, the solid content of glue is 1.6%;

[0054] (2) Glue curing: the glue in the step (1) is allowed to stand for 24 hours to obtain the cured CMC glue;

[0055] (3) Dry powder mixing: Mix the mixture of graphite and silicon-based negative electrodes with conductive carbon black, first stir at a revolution speed of 10rpm for 5min, then stir at a revolution speed of 25rpm for 30min to obtain a dry powder mixture, and mix the conductive carbon black Mix it with the dry powder of the mixture of graphite and silicon-based negative electrode, so that the conductive carbon black is evenly dispersed on the surface of the mixture particles o...

Embodiment 2

[0062] A preparation method of negative electrode slurry, comprising the steps of:

[0063] (1) Preparation of glue solution: Mix 1 / 2 of CMC with 92% deionized water heated at 30°C, stir for 5 minutes at a revolution speed of 10 rpm, and then mix the remaining 1 / 2 of CMC Add it and mix, stir for 5min at a revolution speed of 10rpm, and then stir for 120min at a revolution speed of 20rpm and an autorotation speed of 1000rpm to prepare glue with a solid content of 1.6%; in the above stirring process, it is divided into two steps Add CMC powder for mixing and stirring, so that CMC and heated deionized water are fully and uniformly mixed, accelerating the dissolution of CMC, shortening the stirring time, and making CMC better play the role of improving dispersibility and anti-settling; the stirring temperature during the stirring process is controlled at 25-35°C, prevent CMC failure if the temperature of the glue is too high, and CMC is difficult to dissolve when the temperature o...

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Abstract

The invention provides a preparation method of negative electrode slurry. The preparation method comprises the following steps: (1) preparing a glue solution; (2) curing the glue solution; (3) mixingdry powder; (4) carrying out high-viscosity mixing; (5) carrying out first high-speed dispersion; (6) carrying out second high-speed dispersion; (7) adjusting the viscosity; (8) carrying out reverse stirring; according to the preparation method of the negative electrode slurry, the dispersion uniformity, the stability and the rheological property of the slurry can be improved, the production efficiency of a coating process is improved, and the coating appearance and the coating thickness uniformity are improved, so that the electrical performance and the safety performance of a lithium ion battery are improved. And on the premise of ensuring the performance of the slurry, the stirring time of the slurry is shortened, large-scale application is facilitated, and great production practice significance is achieved.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, and in particular relates to a preparation method of negative electrode slurry. Background technique [0002] Lithium-ion batteries have been widely used in digital communication equipment, power tools, electric vehicles and other fields due to their advantages such as long cycle life, safety and environmental protection, and high energy density. Materials are the basis of lithium-ion batteries, and homogenization is a key process in the production process of lithium-ion batteries. The quality of slurry dispersion directly affects the electrical performance and safety performance of lithium-ion batteries. [0003] At present, the preparation process of lithium battery slurry is mainly divided into two types: (1) Wet pulping process, the basic process is sol-mixing conductive agent-mixing active material-dilution to adjust slurry viscosity, which is currently the mainstream process in Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 陈素娜许少辉
Owner TIANJIN ENERGIES
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