Composite positive electrode material and application thereof

By doping yttrium and phosphate coating on the high-nickel ternary cathode material, the composite cathode material is formed, which solves the interfacial side reactions and structural phase change problems of the material during the circulation process, and significantly improves the cycling performance and high-rate performance of the battery.

CN119725436APending Publication Date: 2025-03-28EVE ENERGY CO LTD
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Patent Information

Application Number
CN202411823511.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

During the circulation process, high-nickel ternary positive electrode materials have interface side reactions, irreversible phase change, gas release and side reactions between electrodes and electrolytes, resulting in phase change in the material structure, microcracks and transition metal ions dissolution, affecting the cycle life and performance of the battery.

Method used

By doping the positive electrode material with yttrium doping and then coating the phosphate surface, a composite positive electrode material is formed. The doping amount of yttrium and phosphate coating amount are controlled between 0.01-3 wt% and 0.01-5 wt% to optimize the structural stability and electrochemical properties of the material.

Benefits of technology

It effectively reduces the interface reaction between the positive electrode material and the electrolyte, optimizes the structural stability of the material and the migration rate of lithium ions, reduces the polarization phenomenon of the battery cell, and improves the cycling performance and high-rate performance of the battery.

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Abstract

The invention provides a composite positive electrode material and application thereof, the composite positive electrode material comprises an inner core and an outer layer coating the inner core, the inner core comprises a yttrium-doped positive electrode material, and the outer layer comprises phosphate; in the inner core, the doping amount of the yttrium element in the inner core is 0.01-3 wt%; and the coating amount of the shell accounts for 0.01-5wt% of the mass of the composite positive electrode material. The composite positive electrode material has relatively high structural stability, and can reduce electrode / electrolyte interface side reactions, improve the electrode / electrolyte interface stability, promote lithium ion transmission, reduce a cell polarization phenomenon, and optimize the cycle performance and high rate performance of the material.
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