Scandium negative electrode material and preparation method and application thereof

Through gel-heat compression domain-limited curing and surface oxidant modification technology, high-purity and high-stability scandium oxide nanoparticles were prepared, which solved the problems of difficulty in controlling, high risk and difficulty in removing impurities of existing scandium oxide preparation methods, and achieved efficient preparation of negative electrode materials suitable for lithium-ion secondary batteries.

CN119683670AActive Publication Date: 2025-03-25LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202311249961.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2025-03-25
Estimated Expiration
2043-09-25

AI Technical Summary

Technical Problem

The existing scandium oxide preparation methods have problems such as difficult control, high risk, difficult to remove residual alkali and difficult to effectively remove impurities, resulting in the prepared scandium oxide material that cannot meet the requirements of lithium-ion secondary battery negative electrode materials.

Method used

Scandium oxide nanoparticles are prepared by gel-heat compression domain-limiting curing, and the gel is formed by the mutual dissolution of scandium-containing compounds and coagulation agents, and the scandium ion dispersion is increased during the hot compression curing process to form a dense material. At the same time, by modifying the surface oxidant solution, carbon elements and impurities are removed to improve the purity of the material.

Benefits of technology

The uniform dispersion, high purity and high stability of scandium-based negative electrode materials are achieved, the process is simplified, the safety is improved, and the material is suitable for the industrial application of lithium-ion secondary battery negative electrode materials.

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Abstract

The embodiment of the invention relates to a scandium-based negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a scandium-containing compound in deionized water to prepare a homogeneous solution, adding a coagulator, and stirring and mixing to obtain a first solution; placing the first solution in a heating device, and enabling a molecular chain of the coagulator to be broken and dissolved to form a cross-linked sol containing a scandium ion solution; standing the sol at room temperature to obtain solid gel; carrying out hot-pressing curing on the solid gel to obtain a cured sample with uniformly dispersed scandium ions; placing the cured sample in a tubular furnace for heat treatment to obtain a scandium nitride-containing carbon matrix, then placing the scandium nitride-containing carbon matrix in a surface oxidant solution for soaking to modify the scandium nitride-containing carbon matrix, washing the modified sample with water, performing suction filtration, and drying to obtain a modified scandium-based carbon matrix; or directly washing and filtering the scandium nitride-containing carbon matrix, and drying to obtain an unmodified scandium-based carbon matrix; and finally, calcining in an oxidizing atmosphere to remove residual carbon so as to obtain the scandium oxide nanoparticles.
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