Preparation method of negative paste and method for solving problem of negative paste gel

A negative electrode slurry and slurry technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of negative electrode slurry gel, slurry gel, etc., and achieve the effect of solving the problem of slurry gel

Active Publication Date: 2019-04-16
HUBEI RT ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing negative electrode slurry and a method for solving the problem of negative electrode slurry gel in order to overcome the defect that slurry gel is prone to occur in the homogenization process of the existing negative electrode slurry

Method used

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  • Preparation method of negative paste and method for solving problem of negative paste gel
  • Preparation method of negative paste and method for solving problem of negative paste gel

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preparation example Construction

[0024] The preparation method of negative electrode slurry of the present invention comprises the following steps:

[0025] (1) under stirring, sodium carboxymethyl cellulose and deionized water are mixed, then defoaming and standing to obtain sodium carboxymethyl cellulose glue;

[0026] (2) Under stirring, add active material, conductive agent, a part of sodium carboxymethyl cellulose glue and styrene-butadiene latex successively in the mixing container, then add deionized water to adjust the viscosity to obtain a slurry, the slurry The mass ratio of the active substance, sodium carboxymethyl cellulose, styrene-butadiene latex and conductive agent is (95-96): (1.65-1.75): (1.9-2.1): 1;

[0027] (3) under stirring, add another part of the sodium carboxymethyl cellulose glue to the slurry prepared in step (2), so that the quality of the active material, sodium carboxymethyl cellulose, styrene-butadiene latex and conductive agent The ratio is (95-96):(1.95-2.05):(1.9-2.1):1. ...

Embodiment 1

[0038] (1) Sodium carboxymethyl cellulose and deionized water were mixed, then defoamed and left to stand for 24 hours to obtain a sodium carboxymethyl cellulose glue with a solid content of 2% by weight.

[0039] (2) under stirring, add graphite, conductive carbon black Super P, a part of sodium carboxymethylcellulose glue and styrene-butadiene latex successively in the mixing container, then add deionized water to adjust viscosity, obtain slurry, the The mass ratio of graphite, sodium carboxymethyl cellulose, styrene-butadiene latex and conductive carbon black Super P in the slurry is 95.5:1.7:2:1.

[0040] (3) under stirring, add another part of sodium carboxymethyl cellulose glue to the slurry prepared in step (2), so that graphite, sodium carboxymethyl cellulose, styrene-butadiene latex and conductive carbon black Super P The mass ratio of is 95.5:2:2:1, thereby preparing negative electrode slurry A1. The photo of the paste is as figure 1 As shown, the slurry has good f...

Embodiment 2

[0045] When the slurry prepared in Comparative Example 1 was a sesame paste gel, under stirring, sodium carboxymethylcellulose glue (solid content was 2% by weight) was added thereto, so that graphite, sodium carboxymethylcellulose The mass ratio of styrene-butadiene latex and conductive carbon black Super P is 95.5:2:2:1. After stirring for 15 minutes, the fluidity of the slurry recovers and can be sieved normally.

[0046] It can be seen that according to the method of the present invention, negative electrode slurry with better fluidity can be prepared, and the problem of slurry gel can be solved.

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Abstract

The invention relates to the technical field of battery paste, and discloses a preparation method of negative paste and a method for solving problem of negative paste gel. The method comprises the following steps of (1) mixing sodium carboxymethyl cellulose and deionized water under stirring, and performing deforming and standing to prepare a sodium carboxymethyl cellulose glue solution; (2) sequentially adding an active substance, a conductive agent, the sodium carboxymethyl cellulose glue solution and styrene-butadiene latex into a mixed container under stirring, and adding the deionized water to adjust viscosity; and (3) adding the sodium carboxymethyl cellulose glue solution into the paste prepared in the step (2) under stirring. According to the method, the negative paste with relatively good mobility can be prepared, and the problem of paste gel can be solved.

Description

technical field [0001] The invention relates to the technical field of battery slurry, in particular to a method for preparing negative electrode slurry and a method for solving the gel problem of negative electrode slurry. Background technique [0002] The current mainstream negative electrode slurry system is active material, sodium carboxymethyl cellulose CMC, binder (styrene-butadiene latex, modified acrylic, nitrile, vinyl polymer, acrylic latex, etc.), conductive agent, CMC is mainly used here for thickening and anti-sedimentation of slurry, strengthening the dispersion of active materials and conductive agents, and assisting binders to play a role in bonding; some battery manufacturers do not add CMC in order to increase energy density, and use an active system Substances, binders, conductive agents. [0003] The binder is easy to demulsify when the slurry is stirred or dispersed, especially the styrene-butadiene latex negative electrode slurry, which will cause the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/587
CPCH01M4/364H01M4/587H01M4/628Y02E60/10
Inventor 王斌梁永光孙杰许中柱王雄林平均
Owner HUBEI RT ADVANCED MATERIALS CO LTD
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