A bifunctional composite coating modified high-nickel layered positive electrode material and a preparation method thereof

By constructing a bifunctional interface layer containing lithium fast ion conductors and inert oxides on the surface of high-nickel layered cathode materials, the problem of interface stability of high-nickel materials under high voltage is solved, thereby improving the specific capacity, rate performance and cycle stability of lithium-ion batteries.

CN122147283APending Publication Date: 2026-06-05XIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF TECH
Filing Date
2026-02-06
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

High-nickel layered cathode materials suffer from interfacial stability issues under high voltage. Residual lithium compounds on the surface are prone to side reactions with the electrolyte, leading to increased interfacial impedance and intensified gas production. The release of lattice oxygen and harmful phase transitions can cause irreversible degradation of the material structure, affecting the battery's long cycle life and safety performance.

Method used

An ultrathin, uniform bifunctional interface layer composed of lithium-containing fast ion conductors and inert oxides was constructed using atomic layer deposition technology. Coatings A and B were deposited on the surface of high-nickel layered cathode material by pulse-hold-purge method to form a synergistic composite coating.

Benefits of technology

This study achieved a synergistic improvement in the interfacial stability and lithium-ion transport kinetics of high-nickel layered cathode materials for lithium-ion batteries, thereby enhancing specific capacity, rate performance, and cycle stability, and extending the battery's long cycle life.

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Abstract

The application discloses a kind of bifunctional composite coating modified high nickel layer positive electrode material and its atomic layer deposition preparation method.The method comprises: high nickel positive electrode material base powder is placed in rotating sample barrel, under the protection of inert gas, atomic layer deposition reaction cavity is heated to working temperature;Multiple precursors constituting coating A and coating B are heated to saturated vapor pressure respectively;In the state of sample barrel rotation, precursor is introduced in the order of pulse-keeping-sweeping, deposition is carried out on the surface of matrix;The deposition cycle number of coating A and coating B is controlled respectively, and the bifunctional composite coating is accurately constructed.The application realizes uniform, continuous, controllable coating of composite coating by atomic layer deposition technology, the obtained material significantly improves the interface ion transmission rate, effectively stabilizes the material interface, thereby has excellent long cycle life and rate performance, and process is suitable for mass production, and application value is high.
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