Preparation method and application of a binder-free carbon-coated ferrous fluoride composite positive electrode

Through the preparation method of carbon-coated ferrous fluoride composite positive electrode without binder, the problem of poor circulation stability of lithium-ion battery energy density and ferrous fluoride positive electrode material is solved, and the battery performance with high energy density and long life is achieved.

CN119029164BActive Publication Date: 2025-04-04CHONGQING TECH & BUSINESS UNIV
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Patent Information

Application Number
CN202410877851.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-02
Publication Date
2025-04-04
Estimated Expiration
2044-07-02

AI Technical Summary

Technical Problem

The energy density of existing lithium-ion batteries has approached the theoretical limit and cannot meet the needs of high energy density. The cyclic stability of ferrous fluoride positive electrode materials leads to rapid capacity attenuation.

Method used

The preparation method of carbon-free carbon-coated ferrous fluoride composite positive electrode is adopted. The conductivity of ferrous fluoride fluoride is enhanced by in-situ carbon coating, and its volume changes are limited, the contact between nanometals and electrolyte is blocked, interface side reactions are suppressed, and ferrous oxide is introduced through the annealing process to improve the stability of the electrode.

Benefits of technology

It significantly improves the electrochemical performance of the ferrous fluoride composite positive electrode, enhances cycling stability and specific capacity, extends the service life of the battery, and reduces manufacturing costs.

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Abstract

The present invention discloses a preparation method and application of a binder-free carbon-coated ferrous fluoride composite positive electrode, and relates to the technical field of lithium ion battery preparation. The present invention at least includes the following steps: S1: mixing and stirring the prepared ferrous fluoride with a sodium carboxymethyl cellulose aqueous solution and Ketjen black to form a slurry; S2: coating the slurry obtained in S1, and obtaining an electrode sheet after vacuum drying; S3: heat-treating the electrode sheet obtained in S2 in an inert atmosphere, and finally taking it out. The present invention provides a simple method for preparing a positive electrode material, in situ one-step synthesis of a carbon-coated ferrous fluoride composite positive electrode material, wherein the carbon-coated shell layer derived from sodium carboxymethyl cellulose after heat treatment plays a "threshold limiting effect", enhances the conductivity of the material, and inhibits the volume expansion and dissolution loss of ferrous fluoride during the charge and discharge process. At the same time, during the heat treatment process, part of ferric oxide is introduced through recrystallization to enhance the electrode stability, and the two work together to effectively enhance the electrochemical performance of the electrode.
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