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Abstract

A high-nickel ternary positive electrode material, has a structural formula of Li_xNi_aM_bCo_cN_zO₂. A content of a cobalt element within a range of 1.5 μm from a surface of the positive electrode material accounts for 48%-85% of a content of the cobalt element in the positive electrode material. A high-nickel ternary positive electrode material is designed in the present application, which has a specific structure with cobalt element distributed gradiently from inside to outside, and thus a high-nickel low-cobalt positive electrode material product with good stability can be directly obtained. The content of cobalt in the near-surface region and surface region of the positive electrode material is high, and high-content cobalt may react with Li⁺that cannot be re-inserted to generate lithium cobaltate. This increases part of the capacity and avoids the generation of residual alkali, thereby improving the capacity and cycle performance of the high-nickel ternary positive electrode material.

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