Thick-electrode positive plate, preparation method thereof and primary battery

By using binder resin to perform fibrosis treatment and granulation treatment in the process of preparing thick electrode positive electrode sheets, combined with differential temperature or differential rolling technology, the problems of difficult production and uneven diaphragm thickness in the prior art are solved, and a positive electrode sheet preparation with high strength, low powder drop rate and thickness uniformity are achieved.

CN119764316AActive Publication Date: 2025-04-04EVE ENERGY CO LTD
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Patent Information

Application Number
CN202411999766.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-04-04
Estimated Expiration
2044-12-31

AI Technical Summary

Technical Problem

The prior art has problems such as difficult production, high degree of fiberization of polytetrafluoroethylene, uneven thickness of the film formed, and poor adhesion between the current collector and the dry electrode film.

Method used

The binder resin is used for dispersion treatment, a three-dimensional fiber network is formed by shear fibrosis, and a granulator is used for granulation to form rubber-like particles with a certain strength, and the thickness uniformity of the diaphragm is controlled through differential temperature or differential roller film forming technology.

Benefits of technology

The bonding strength and electrochemical performance of the positive electrode material are improved, the high strength, low powder loss rate and thickness uniformity of the thick electrode positive electrode sheet are achieved, and the energy density of the battery is improved.

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Abstract

The invention provides a thick-electrode positive plate, a preparation method thereof and a primary battery. The method comprises the following steps: firstly, mixing a positive active material, a conductive agent and binder resin to obtain a mixture; carrying out fibration treatment on the mixed material to obtain a fibration mixed material; then, the fiberized mixed material and a granulating agent are subjected to granulation treatment, a precursor material is obtained, and the granulating agent is liquid with the vapor pressure not lower than 0.2 mmhg; finally, the precursor material is subjected to rolling film forming treatment, and the thick electrode positive plate is obtained. The preparation method provided by the invention can be widely applied to a battery system in which the thick electrode (greater than 500 microns) needs to be manufactured by using the current collecting net, and solves the problems that the thick electrode pole piece using the current collecting net is difficult to continuously and automatically produce, the powder falling rate of the pole piece is high, the thickness is not uniform and the like.
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