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Lithium battery negative electrode slurry dry preparation method

A negative electrode slurry and preparation method technology, which is applied in the field of dry preparation of lithium battery negative electrode slurry, can solve the problems of lower production costs, poor electrode pieces, poor stirring effect, etc., and achieve the effect of reducing preparation time and usage amount

Active Publication Date: 2021-02-23
山东派智新能源科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a dry preparation method of lithium battery negative electrode slurry, which solves the technical problems of poor stirring effect and low production efficiency in the preparation of lithium battery negative electrode slurry in the prior art, reduces production costs, and improves the production efficiency of the slurry. During the coating process, due to the particles and streaks caused by the uneven dispersion of the slurry, the pole piece is defective, reducing the slurry preparation time, increasing the solid content of the slurry, and reducing the amount of deionized water used

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  • Lithium battery negative electrode slurry dry preparation method
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  • Lithium battery negative electrode slurry dry preparation method

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Embodiment 1

[0028] The stirring equipment used in this embodiment is Guangzhou Hongyun 300L double planetary mixer.

[0029] The dry preparation method of lithium battery negative electrode slurry of the present invention comprises the following steps:

[0030] (1) Powder premixing: such as figure 1 Shown is the sequence diagram of powder feeding. According to the process addition amount, add 50% graphite, conductive carbon black (SP) and sodium carboxymethyl cellulose (CMC), and 50% graphite into the mixing tank of the mixer in sequence, and mix the mixing tank and Close the mixer, turn on the stirring and dispersing mode of the mixer, set the stirring speed to 20rpm, and the dispersion speed to 500rpm before premixing without vacuum; this step is to mix all kinds of powder materials evenly, and observe the state of the powder materials in the mixer through the window of the mixer during the mixing process , whether there is dust, you can fine-tune the speed of the mixer according to th...

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Abstract

The invention belongs to the technical field of lithium battery slurry preparation, and particularly relates to a lithium battery negative electrode slurry dry preparation method. The method comprisesthe following steps: powder premixing, powder infiltration, powder kneading, high-speed stirring, slow stirring defoaming, sieving and discharging. All powder materials are put into a stirring tank of a stirrer, and the stirring effect is achieved through the steps of powder premixing, powder soaking, powder kneading, high-speed stirring, slow stirring defoaming and the like. The stirring effectof the lithium battery negative electrode slurry is improved and the production efficiency of the stirring process is improved in a dry stirring manner, so that the poor pole piece caused by the conditions of particles, lineation and the like due to the fact that the slurry is not uniformly dispersed in the coating process of the slurry is improved; a glue making step in the prior art is cancelled, so the slurry preparation time is shortened, and the powder stirring time can be saved by about 5 h in each batch; and the solid content of the slurry is increased and can be increased to 54-56% from 48-50% through conventional stirring, and the use amount of deionized water is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium battery slurry preparation, and in particular relates to a dry preparation method of lithium battery negative electrode slurry. Background technique [0002] With the continuous expansion of new energy fields such as power, energy storage, military industry, consumer products, and 3C, the demand and quality requirements for lithium batteries are also increasing. At the same time, there are also great requirements for lithium battery production efficiency and product quality. and challenge. [0003] At present, in the preparation process of lithium battery negative electrode slurry, most of them use wet stirring and semi-dry stirring methods. During coating, the slurry that is not uniformly dispersed will cause defects such as coating particles and scribing, and finally Affect the performance and safety of the battery. In addition, how to improve production efficiency without increasing productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/052H01M10/058B01F7/00
CPCH01M4/0402H01M10/058H01M10/052B01F27/00Y02E60/10Y02P70/50
Inventor 严硕高鹏坤张亚丽田始俊殷昊曦张雨田李杰
Owner 山东派智新能源科技有限公司
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