Graphite negative electrode material, graphite negative electrode and preparation method and application thereof

By forming a polyamide organic polymer cladding layer on the surface of the graphite negative electrode material, the irreversible capacity attenuation and volume expansion problems of graphite negative electrode material in lithium-ion batteries are solved, and the stability and safety performance of the battery are improved.

CN119542403APending Publication Date: 2025-02-28HUNAN CHMM-SUNWARDS NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202411801219.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-02-28

AI Technical Summary

Technical Problem

Graphite negative electrode materials have problems with irreversible capacity attenuation and volume expansion during the use of lithium-ion batteries, resulting in rupture of the SEI film and reduced battery stability.

Method used

A graphite oxide material oxidized by hydrogen peroxide is used as the graphite negative electrode material, and a polyamide organic polymer cladding layer is formed on its surface, and connected to the graphite material through amide functional groups to form a stable organic polymer cladding layer.

Benefits of technology

By forming a stable organic polymer coating, the irreversible loss of lithium ions is reduced, the first Coulomb efficiency of the battery is improved, the continuous reaction between the electrolyte and the negative electrode material is alleviated, the growth of the SEI film and the attenuation of battery performance is slowed, the risk of short circuits within the battery is reduced, and the safety performance of the battery is improved.

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Abstract

The invention relates to the technical field of battery negative electrode materials, and provides a graphite negative electrode material, a graphite negative electrode and a preparation method and application thereof. The method comprises the following steps: S1, stirring and dispersing a powdery graphite material, adding into hydrogen peroxide, stirring and reacting, washing and drying to obtain a graphite oxide material A; s2, mixing and dispersing the graphite oxide material A and a polar solvent, adding a catalyst, then adding a polymerization precursor, stirring and reacting to obtain polymer coated graphite; and S3, carrying out suction filtration on the polymer-coated graphite B by using a polar solvent, and drying to obtain the organic polymer-coated graphite negative electrode material. The catalyst and carboxyl form an unstable O-acyl isourea intermediate and an NHS ester intermediate to activate the carboxyl, and then the intermediate can react with active amino to form a stable amido bond, so that a polymer precursor can stably coat the surface of a graphite material to form a uniform and stable artificial SEI film.
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Citation Information

Patent Citations

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