High-nickel, low-cobalt cathode materials, their preparation methods and applications

By forming a coating layer of spinel phase and rock salt phase on the surface of high-nickel and low-cobalt cathode material, the decomposition and corrosion problems of the material during charging and discharging are solved, the capacity and life of the battery are improved, and the production cost is reduced.

CN115911302BActive Publication Date: 2026-05-26TIANJIN B&M SCI & TECH LTD
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Patent Information

Application Number
CN202211302463.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-24
Publication Date
2026-05-26
Estimated Expiration
2042-10-24

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Abstract

The high-nickel, low-cobalt cathode material provided in this application includes a cathode material substrate, a first coating layer, and a second coating layer. The first coating layer coats the surface of the cathode material substrate, and the second coating layer coats the surface of the first coating layer. The first coating layer comprises a material with the chemical formula Li. a Ni b Co c M 1‑b‑c O d The material comprises M, which includes one or both of Mn and Al, with 0.2 ≤ a ≤ 1, 0.88 < b ≤ 0.98, 0 ≤ c < 0.06, b + c < 1, and 1.6 ≤ d ≤ 2; the material of the second coating layer includes one or more of Li3PO4, Li2SO4, and LiPO3. The above-mentioned high-nickel, low-cobalt cathode material can prevent the electrolyte from corroding the cathode material matrix, protect the integrity of the bulk structure, and effectively inhibit the decomposition and collapse of the layered structure of the high-nickel, low-cobalt cathode material during charge-discharge cycles, thereby improving the long-cycle performance of the high-nickel, low-cobalt cathode material.
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