Cathode material and preparation method thereof, and lithium ion battery

Abstract

The application provides a positive electrode material and a preparation method thereof. The positive electrode material comprises a lithium-containing nickel metal composite oxide and a coating layer. The lithium-containing nickel metal composite oxide is internally doped with an N' element, and the N' element is a metal element. The coating layer is at least partially located on the surface of the lithium-containing nickel metal composite oxide, and the coating layer comprises an organic framework material-inorganic metal compound. The application also provides a lithium ion battery comprising the positive electrode material. The positive electrode material effectively reduces residual alkali on the surface of the material and internal Li / Ni cation mixing, and improves the processing performance, rate performance, cycle performance and safety performance of the battery. Moreover, the process is simple, the cost is low, and the positive electrode material is suitable for large-scale production.

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