A lithium-rich ternary material coated with a conductive polymer based on oCVD technology and a preparation method thereof

By constructing a conductive polymer protective layer on the surface of lithium-rich ternary cathode material using oCVD technology, the problems of phase transition and voltage decay during the cycling process are solved, enabling the preparation of high-performance and green manufacturing electrode materials, and improving the energy density and safety of lithium-ion batteries.

CN122158534APending Publication Date: 2026-06-05ZHEJIANG QUZHOU YOUNGDREAM LI-ION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG QUZHOU YOUNGDREAM LI-ION TECH CO LTD
Filing Date
2026-03-23
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Lithium-rich manganese-based layered oxide cathode materials suffer from irreversible phase transitions, severe voltage decay, and poor rate performance during cycling. Furthermore, traditional coating techniques struggle to form uniform and dense nanoscale coating layers on complex structural surfaces.

Method used

Oxidation chemical vapor deposition (oCVD) technology is used to construct a uniform and dense conductive polymer protective layer on the surface of lithium-rich ternary cathode material by controlling the oxidant sublimation rate and reaction conditions. The process includes vacuuming, fluidized gas purging, chemical vapor deposition, and exhaust gas treatment steps.

Benefits of technology

It significantly improves the electronic conductivity and cycle stability of the material, enhances the uniformity of the electrode interface, improves rate performance and cycle life, and avoids solvent residue and impurity introduction, thus possessing green manufacturing characteristics.

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Abstract

The present application relates to a kind of coating lithium-rich ternary material of conductive polymer based on oxidation chemical vapor deposition technology (oCVD) technology and its preparation method.The preparation method is by in-situ deposition uniform conductive polymer film on the surface of lithium-rich ternary positive electrode material, the conductivity and structural stability of positive electrode material are significantly improved.In the preparation process, by adjusting the gas flow ratio of oxidant and monomer, evaporator / sublimator temperature and reaction time, uniform and conformal conductive coating is formed.The method not only improves the uniformity of coating, avoids solvent pollution, but also effectively slows down the structural change at high temperature, further enhances the rate performance and cycle stability of the material.Compared with traditional solution method, the oCVD process of the present application can realize the preparation of high-performance positive electrode material in large-scale production, has the advantages of low cost, high efficiency and good controllability, and is suitable for industrial production of lithium-rich ternary material.
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