Preparation method of atomic and molecular layer deposition combined with modified high-nickel ternary positive electrode material and application thereof

By constructing a rigid-flexible coating on the surface of high-nickel ternary cathode material using a combination of atomic/molecular layer deposition, the problems of interfacial side reactions and structural stress during the cycling process are solved, thereby improving high cycle stability and rate performance and promoting the development of high-energy-density lithium-ion batteries.

CN122147284APending 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 ternary cathode materials face interfacial side reactions and structural stress problems during cycling, and existing modification methods are difficult to improve both interfacial chemical stability and mechanical structural integrity at the same time.

Method used

A composite coating combining rigidity and flexibility is constructed on the surface of high-nickel ternary cathode material using a combination of atomic layer deposition and molecular layer deposition. The inner layer is an oxide coating, and the outer layer is a flexible porous organic-inorganic hybrid coating. The coating thickness and uniformity are precisely controlled by atomic/molecular layer deposition technology.

Benefits of technology

It significantly improves the cycle stability and rate performance of the material, solves the core bottleneck of high-nickel ternary cathode materials in the cycle process, and enhances the energy density and lifespan of lithium-ion batteries.

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Abstract

The application relates to the technical field of lithium ion battery positive electrode materials, and specifically discloses a preparation method of an atomic / molecular layer deposition combined modified high-nickel ternary positive electrode material, which comprises the following steps: placing high-nickel ternary positive electrode material powder in a deposition cavity, and introducing inert gas; adopting atomic layer deposition technology to deposit an oxide coating layer on the surface of the base material; and adopting molecular layer deposition technology to deposit a flexible porous organic-inorganic hybrid coating layer on the surface of the oxide coating layer, so as to obtain the atomic / molecular layer deposition combined modified high-nickel ternary positive electrode material. The application utilizes the precise control advantage of the atomic / molecular layer deposition technology, realizes the complementary functions of interface blocking and stress buffering through the composite coating layer, effectively improves the interface and structural stability of the high-nickel ternary positive electrode material, improves the cycle and rate performance of the high-nickel ternary positive electrode material, provides key support for the research and development of high-energy-density lithium batteries, and has important technical value and industrial application prospect.
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