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Anode slurry as well as preparation method and use thereof

A negative electrode slurry and slurry technology, applied in the field of negative electrode slurry and its preparation, can solve the problems of low production efficiency, long stirring time, unstable slurry performance, etc., so as to reduce processing cost, improve production efficiency, and reduce process time the effect of shortening

Inactive Publication Date: 2018-07-13
BEIJING NAT BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide a method for preparing negative electrode slurry to solve the problems of long stirring time, low production efficiency, unstable performance of the prepared slurry, easy sedimentation and poor dispersion effect in the existing pulping process question

Method used

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Examples

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Effect test

preparation example Construction

[0037] One aspect of the present invention provides a kind of preparation method of negative electrode slurry, comprises the following steps:

[0038] Step a): First, mix and stir the first binder and dispersant with 60-70% water to prepare glue;

[0039] Step b): mixing the glue with the negative electrode active material and then mixing with 20-25% water to obtain a slurry intermediate product;

[0040] Step c) mixing and stirring the obtained slurry intermediate product with the second binder and the remaining amount of water to obtain the negative electrode slurry;

[0041] Wherein, the total amount of water used in step a) to step c) is the formula water.

[0042] In the preparation method of the negative electrode slurry provided by the present invention, part of water is added first in the process of making glue, instead of adding all the water at one time, a high-viscosity glue is obtained by stirring, and the glue is reduced by stirring at high viscosity. The mixing...

Embodiment 1

[0075] This embodiment is a preparation method of negative electrode slurry, comprising the following steps:

[0076] Step a): first mix and stir the CMC binder, dispersant and conductive agent with 70% water to prepare glue;

[0077] The process parameters of mixing and stirring are: first stir at 10rpm revolution speed for 10min; then adjust the revolution speed to 20rpm, adjust the rotation speed to 1000rpm, and stir for 120min;

[0078] Step b): first mix and stir the glue with 4 / 7 of the negative electrode active material evenly, then mix and stir with the remaining part of the negative electrode active material, and then mix and stir with 25% water to obtain a slurry intermediate product;

[0079] The glue is mixed with 4 / 7 of the negative electrode active material, and the stirring process parameters are: the revolution speed during the stirring process is 20rpm, the rotation speed is 1000rpm, and the stirring time is 30min;

[0080] The process parameters for mixing a...

Embodiment 2

[0086] This embodiment is a preparation method of negative electrode slurry, comprising the following steps:

[0087] Step a): first mix and stir the CMC binder, dispersant and conductive agent with 65% water to prepare glue;

[0088] The process parameters of mixing and stirring are as follows: first stir at a revolution speed of 15rpm for 15min; then adjust the revolution speed to 18rpm, adjust the rotation speed to 900rpm, and stir for 110min;

[0089] Step b): first mix and stir the glue with 3 / 7 of the negative electrode active material evenly, then mix and stir with the remaining part of the negative electrode active material, and then mix and stir with 20% water to obtain the slurry intermediate product;

[0090] Mix and stir the glue solution with 3 / 7 of the negative electrode active material. The stirring process parameters are as follows: the revolution speed during the stirring process is 15 rpm, the rotation speed is 900 rpm, and the stirring time is 20 min;

[00...

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Abstract

The invention provides anode slurry as well as a preparation method and use thereof, and relates to the field of battery slurry. The preparation method of the anode slurry comprises the following steps: (a) firstly, mixing a first binder and a dispersing agent with 60-70% of water to obtain a glue solution; (b) mixing the glue solution and an anode active material, and then mixing the obtained mixture with 20-25% of water to obtain a slurry intermediate product; (c) mixing the obtained slurry intermediate product with a second binder and the remaining amount of water to obtain the anode slurry; the total amount of water used in the steps (a), (b) and (c) is a formula amount. After the method is adopted, the technical problems that in the existing pulping process, mixing time is long, the production efficiency is low, and the prepared slurry is unstable in performance, easy to settle and poorer in dispersion effect can be solved; the anode slurry which is good in stability, not liable to settle and good in dispersion effect, and has high adhesion to a negative electrode current collector is obtained while the production efficiency is increased.

Description

technical field [0001] The invention relates to the field of battery slurry, in particular to a negative electrode slurry and its preparation method and application. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the development trend of secondary batteries; they have been widely used in wireless communications, digital cameras, notebook computers and other portable appliances. Power supply, and has broad application prospects as a power supply for special applications such as aerospace, national defense, electric vehicles, electric motorcycles, field operations, and submarines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139B01F13/10B01F15/00
CPCH01M4/139B01F33/81B01F35/221422B01F35/22161Y02E60/10
Inventor 陈素娜吴丛笑郭伟文哲泽刘阳
Owner BEIJING NAT BATTERY TECH
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