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Negative pole slurry of lithium ion battery, rapid preparation method thereof and negative pole piece of lithium ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of high energy consumption of equipment, unfavorable continuous operation of production efficiency, long mixing time, etc., to reduce equipment Effects of energy consumption, shortening wetting and dispersing time, and reducing mixing time

Active Publication Date: 2017-10-24
HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods have their own advantages and disadvantages, but there is a problem of long mixing time. Generally, the total mixing time is not less than 4 hours. Long-term mixing not only consumes a lot of equipment energy consumption, but also is not conducive to the improvement of production efficiency and continuous Execution of chemical work

Method used

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  • Negative pole slurry of lithium ion battery, rapid preparation method thereof and negative pole piece of lithium ion battery
  • Negative pole slurry of lithium ion battery, rapid preparation method thereof and negative pole piece of lithium ion battery

Examples

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Effect test

preparation example Construction

[0026] Such as figure 1 Shown, this preparation method comprises the following steps:

[0027] S1. Stir the active material, conductive agent and thickener in a mixer at a low speed to form a mixed powder.

[0028] Specifically, put 94-95 parts by weight of the active material, 1-2 parts by weight of the conductive agent and 1.5 parts by weight of the thickener into the mixing barrel of the mixer, select a lower stirring speed, To prevent the powder from splashing out, choose to stir at a stirring speed of 5 rpm / min to 25 rpm / min for 10 minutes to form a mixed powder. Further, the stirring speed is preferably 15 rpm / min to 20 rpm / min.

[0029] Wherein, the active material can be a negative electrode graphite material, and the negative electrode graphite material used can be one or more of artificial graphite, natural graphite, and mesocarbon microspheres; the conductive agent can be conductive carbon black, conductive graphite, carbon fiber One or more of them; the thickener...

Embodiment 1

[0044] Each of the following sets represents 100g;

[0045] Take 1.0 parts of conductive carbon black, 95.0 parts of artificial graphite, and 1.5 parts of thickener, and add them to a mixer and mix them uniformly for 10 minutes at a speed of 20 rpm to form a powder; under slow stirring, add 10 parts of deionized water from the feeding port to Stir at a stirring speed of 40rpm / min for 10 minutes; spray and add 43 parts of deionized water from the feeding port under slow stirring, stir at a stirring speed of 40rpm / min and a dispersion speed of 1000rpm / min for 10 minutes; directly add 47 parts of deionized water After water, stir for 10 minutes at a stirring speed of 15rpm / min and a dispersion speed of 2500rpm / min; add styrene-butadiene rubber solution containing 2.5 parts of solids, and stir for 10 minutes at a stirring speed of 15rpm / min and a dispersion speed of 300rpm / min Obtain negative electrode slurry.

Embodiment 2

[0047] Each of the following sets represents 100g;

[0048] Take 1.5 parts of conductive carbon black, 94.5 parts of artificial graphite, and 1.5 parts of thickener, add them into the mixer and mix them uniformly for 10 minutes at a speed of 20 rpm to form a powder; under slow stirring, add 12 parts of deionized water from the feeding port to Stir at a stirring speed of 45rpm / min for 15 minutes; spray and add 40 parts of deionized water from the feeding port under slow stirring, stir at a stirring speed of 40rpm / min and a dispersion speed of 1000rpm / min for 15 minutes; directly add 48 parts of deionized water After water, stir for 10 minutes at a stirring speed of 15rpm / min and a dispersion speed of 2500rpm / min; add styrene-butadiene rubber solution containing 2.5 parts of solids, and stir for 10 minutes at a stirring speed of 15rpm / min and a dispersion speed of 300rpm / min Obtain negative electrode slurry.

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Abstract

The invention discloses negative pole slurry of a lithium ion battery, a rapid preparation method thereof and a negative pole piece of the lithium ion battery. The preparation method comprises the following steps: stirring an active substance, a conducting agent and a thickening agent in a stirring machine at a low speed to form mixed powder, then in the state that low-speed stirring of the mixed powder is maintained, adopting a spraying manner to add a first solvent, carrying out high-speed stirring to form spherical particles, then adopting the spraying manner again to inject a second solvent into the spherical particles, carrying out high-speed stirring and low-speed dispersion to prepare slurry, then directly adding remaining solvent, carrying out low-speed stirring and high-speed dispersion to prepare a mixed solution, finally adding an adhesive, and carrying out low-speed stirring and low-speed dispersion to prepare the negative slurry of the lithium ion battery. The addition of the solvents adopts stirring and spraying manners, and the power is rapidly moistened to form the uniform spherical particles, so that the total mixing time is reduced, the production efficiency is improved, and the equipment energy consumption is reduced. The negative pole slurry of the lithium ion battery prepared by the method has high stability, and the negative pole piece dried and prepared by the negative pole slurry coated on a current collector is relatively attractive in appearance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode slurry, a method for rapidly preparing the lithium ion battery negative electrode slurry, and a lithium ion battery negative electrode sheet prepared from the negative electrode slurry. Background technique [0002] Lithium-ion batteries are one of the most widely used batteries in the world today because of their outstanding advantages such as light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, and wide temperature range. Key products for energy development. [0003] Lithium-ion batteries are made of positive and negative plates and separators, which are then loaded into the case and filled with electrolyte. The negative electrode sheet is obtained by dispersing the negative electrode active material and auxiliary materials in a solvent to form a slurry, which is evenly coated on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M4/04H01M10/0525
CPCH01M4/0404H01M4/0471H01M4/133H01M4/362H01M4/583H01M4/62H01M4/621H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 赖真龙
Owner HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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