A composite modified lithium-rich manganese-based positive electrode material, a preparation method and application thereof

CN121484015BActive Publication Date: 2026-10-16GEM CO LTD +1
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Patent Information

Application Number
CN202511623232.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-11-07
Publication Date
2026-10-16
Estimated Expiration
2045-11-07

AI Technical Summary

Technical Problem

[0006]上述方案虽然提高了富锂锰基正极材料的循环稳定性，但是制得正极材料难以保证材料本申的容量优势，倍率性能也有待提升

Benefits of technology

[0056] (1) This invention improves the structural stability, electrochemical stability and ion transport performance of lithium-rich manganese-based cathode materials by performing multiple coating modifications, while maintaining the high specific capacity of the materials: the inner LiFePO4 layer can buffer the stress and structural evolution during cycling and inhibit the dissolution of transition metals; the middle S-doped NiCoFeO x The nanosheets, rich in oxygen vacancies, possess excellent electronic conductivity and interfacial reactivity, promoting lithium-ion diffusion and mitigating oxygen release under high voltage. The outer Al2O3–PEG composite film combines chemical inertness and flexibility, effectively isolating electrolyte corrosion and mitigating coating cracking caused by volume changes. The synergistic effect of the three layers significantly reduces interfacial impedance, improves rate performance and cycle retention, providing reliable interfacial protection and electrochemical kinetics assurance for the long-term stable operation of high-voltage lithium-rich manganese-based cathodes.

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Abstract

The application provides a composite modified lithium-rich manganese-based positive electrode material and a preparation method and application thereof, and the composite modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based active core and a lithium iron phosphate transition layer, a sulfur-doped nickel-cobalt-iron oxide nanosheet intermediate layer and an Al2O3-PEG composite coating layer which are sequentially coated on the surface of the lithium-rich manganese-based active core. Through multiple coating modification of the lithium-rich manganese-based positive electrode material, the side reactions of the material in the use process are reduced, and the rate performance, cycle stability and voltage stability of the material are improved while the high specific capacity of the material is maintained.
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