Cathode material, preparation method thereof, cathode sheet and battery

By designing a multi-layer coating structure and utilizing organic acid treatment and composite oxide barriers, the problem of residual alkali on the surface of high-nickel ternary cathode materials was solved, achieving high capacity and long cycle life in high-nickel ternary cathode materials and improving the electrochemical performance of the battery.

CN122025613BActive Publication Date: 2026-06-26JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
Filing Date
2026-04-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies struggle to reduce residual alkali on the surface of high-nickel ternary cathode materials while simultaneously achieving high capacity and long cycle life. Conventional methods often lead to a decline in material performance or interface instability.

Method used

The system employs a multi-layer coating structure, including a high-nickel ternary core treated with organic acid, a first coating layer of cobalt-titanium-aluminum composite oxide, and a second coating layer of selenium-containing oxide, forming a gradient protection structure. The organic acid treatment removes alkaline impurities from the surface, the composite oxide layer provides structural support, and the selenium oxide forms a dense barrier, working synergistically to inhibit electrolyte erosion and interfacial side reactions.

Benefits of technology

It significantly reduces residual alkali on the material surface, improves the structural and interfacial stability of the material during long-term cycling, and achieves excellent cycle life and capacity retention.

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Abstract

The application relates to the technical field of batteries, in particular to a positive electrode material, a preparation method thereof, a positive electrode sheet and a battery. The positive electrode material comprises: an inner core, wherein the inner core comprises a high-nickel ternary positive electrode material; a first coating layer coated on the surface of the inner core, wherein the first coating layer comprises an oxide of cobalt, an oxide of titanium and an oxide of aluminum; and a second coating layer coated on the surface of the first coating layer, wherein the second coating layer comprises an oxide of selenium; wherein the surface of the high-nickel ternary positive electrode material is treated by an organic acid. The technical scheme can reduce the residual alkali on the surface of the material, effectively improve the structural stability and interface stability of the material in the long-term cycle process, and thus realize excellent cycle life and capacity retention rate.
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