Coated modified nickel cobalt lithium aluminate positive electrode material as well as preparation method and application thereof

By using a core-shell structure to coat modified lithium nickel cobalt aluminum oxide cathode materials and doping with specific elements, the technical problems of poor rate performance, poor cycle life, and poor thermal effect of lithium nickel calcium aluminum oxide cathode materials have been solved, enabling efficient technical applications.

CN121964565APending Publication Date: 2026-05-01GEM WUXI ENERGY MATERIAL CO LTD
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Patent Information

Application Number
CN202511848064.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-09
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing lithium nickel cobalt aluminum oxide cathode materials have poor rate performance, cycle life, and thermal stability, resulting in tortuous lithium-ion diffusion paths, low tap density, rapid capacity decay, and high risk of local hot spots.

Method used

The cathode material is a modified nickel-cobalt-aluminate cathode material, consisting of a core and a coating layer. The core has the general formula LiaNixCoyAlzLpO2, and the coating layer contains fluorine and carbon elements. Through specific sintering and drying processes, a core-shell structure is formed, which improves tap density and electronic conductivity, and stabilizes the crystal structure.

Benefits of technology

While maintaining high capacity, it improves electronic conductivity and rate performance, suppresses lithium-ion transport resistance, reduces the risk of local hot spots, extends battery cycle life, and enhances material thermal stability.

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Abstract

The invention belongs to the technical field of battery materials, and particularly relates to a coated modified nickel cobalt lithium aluminate positive electrode material as well as a preparation method and application thereof. The lithium nickel cobalt aluminate positive electrode material comprises an inner core and a coating layer coated on the inner core, a is greater than or equal to 1.01 and less than or equal to 1.05, x is greater than or equal to 0.75 and less than or equal to 0.90, y is greater than or equal to 0.05 and less than or equal to 0.20, z is greater than or equal to 0.01 and less than or equal to 0.05, and p is greater than or equal to 0 and less than or equal to 0.05; l comprises one of Mg, Zr, Mo, Ti and Zn; and the tap density of the coated and modified nickel cobalt lithium aluminate positive electrode material is 2.7-3.2 g / cm < 3 >. The coated modified nickel cobalt lithium aluminate positive electrode material provided by the invention has relatively good electronic conductivity and rate capability, and can inhibit lattice collapse caused by phase change under high voltage, reduce intergranular gaps, enhance thermal stability of the material, inhibit capacity fading caused by structure looseness in charge and discharge processes, and prolong the cycle life of a battery.
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