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
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN B&M SCI & TECH LTD
- Filing Date
- 2022-10-24
- Publication Date
- 2026-05-26
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Figure CN115911302B_ABST
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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