Modified Lithium-Ion Battery Cathode Material, Its Preparation Method and Application

Modifying the lithium-ion positive electrode material by doping and coating carbon, the purity and stability of Li5FeO4 material is solved, the electrochemical activity and battery performance are improved, and the preparation process is simplified.

CN114709383BActive Publication Date: 2025-07-04GUANGDONG BRUNP RECYCLING TECH CO LTD +2
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Patent Information

Application Number
CN202210269254.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-03-18
Publication Date
2025-07-04
Estimated Expiration
2042-03-18

AI Technical Summary

Technical Problem

The existing Li5FeO4 positive electrode materials have low purity, large particle size differences, non-conductive and unstable air, and complex preparation process, affecting electrochemical activity and industrial production.

Method used

Agglomerated agglomerate modified lithium ion positive electrode material is used to form spherical particles through pulverization and secondary sintering. The carbon is doped in the material and the surface is coated with a carbon layer to block the contact between water and carbon dioxide in the air, thereby improving conductivity and stability.

Benefits of technology

The conductivity and stability of the material are improved, the charge and discharge specific capacity and the circulation performance of lithium-ion batteries are improved, the material is more stable in the air, and the preparation process is simplified.

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Abstract

The present invention belongs to the technical field of battery materials, and discloses a modified lithium-ion battery cathode material, a preparation method thereof, and an application thereof. The chemical formula of the modified lithium-ion battery cathode material is Li5FeO4@C; the modified lithium-ion battery cathode material is an aggregate, and the aggregate is formed by agglomeration of spherical particles. The modified lithium-ion cathode material prepared in the present invention is an aggregate doped and coated with carbon. Firstly, it can improve the conductivity of the material, reduce the polarization performance of the material, and increase the charging capacity of the material at high rates; secondly, it can block the direct contact between the surface of Li5FeO4 and water and carbon dioxide in the air, eliminate or alleviate the "air-sensitive effect" on the surface of the modified lithium-ion cathode material, and improve the stability of the material in the air.
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