Battery negative electrode slurry, negative electrode pole piece, preparation method of negative electrode pole piece and battery

By introducing a specific proportion of composite surfactant into the negative electrode slurry of the battery, the viscosity and fluidity of the slurry are optimized, and the problem of poor edge thickness of the thinner battery sheet active coating in the prior art is solved, thereby achieving a more uniform coating thickness and higher battery performance.

CN119695073AActive Publication Date: 2025-03-25EVE ENERGY CO LTD
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Patent Information

Application Number
CN202411864223.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-25
Estimated Expiration
2044-12-17

AI Technical Summary

Technical Problem

In the prior art, the effect of thinning the edge thickness of the active coating of the battery electrode sheet is limited, and the operation method is difficult, and it is easy to cause damage to the electrode sheet.

Method used

A battery negative electrode slurry is provided, which contains an anode active material, a conductive agent, a binder, a surfactant and a solvent, wherein the surfactant is composed of non-ionic and anionic surfactants. Through the mixing and preparation of a specific proportion, the viscosity, fluidity and surface tension of the slurry are optimized and the uniformity of the edge thickness of the coating is improved.

Benefits of technology

Effectively thin the edge thickness of the active coating of the electrode sheet, improve the consistency and uniformity of the coating thickness, avoid thick edge phenomena, reduce operation difficulty and production costs, and improve the overall performance and stability of the battery.

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Abstract

The invention discloses battery negative electrode slurry, a negative electrode plate, a preparation method of the negative electrode plate and a battery. The negative electrode slurry comprises a negative electrode active material, a conductive agent, a binder, a solvent and a surfactant; the surfactant is composed of a nonionic surfactant and an anionic surfactant, and the weight ratios of the nonionic surfactant and the anionic surfactant are 5%-15% and 85%-95% respectively; and the surfactant accounts for 0.01-2wt% of the battery negative electrode slurry. The mixed surfactant with a special proportion is added into the slurry, so that the leveling property, viscosity and thixotropy of the slurry in the pole piece coating process are improved, the slurry has better dispersity and leveling property when the pole piece is coated, the effect of controlling the edge thickness is realized, and the purposes of improving the thickness uniformity of the pole piece and thinning the edge are achieved; the method is low in cost, simple to operate and easy to control, does not need to perform other treatment on the edge, prevents edge residues from damaging the pole piece, and improves the consistency and stability of the battery.
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