Metal solid solution modified high-nickel ternary anode material and preparation method thereof

Abstract

The invention discloses a metal solid solution modified high-nickel ternary anode material and a preparation method thereof. The material is of a core-shell structure which comprises a high-nickel ternary anode material matrix, a transition layer and a coating layer sequentially from inside to outside, wherein the coating layer comprises metal lithium salt and one or more solid solution anode active substance generated by reaction between a heterogeneous metal precursor and a high-nickel ternary anode material precursor; the transition layer is a high-nickel ternary anode material doped by a heterogeneous metal element. The preparation method comprises the following steps: (1) uniformly mixing the high-nickel ternary anode material precursor, the heterogeneous metal precursor and the lithium salt to obtain a mixture; (2) performing high-temperature calcination of the mixture to obtain the metal solid solution modified high-nickel ternary anode material. The technological process is simple, and the production process is environmentally friendly; the metal solid solution modified high-nickel ternary anode material has higher thermal stability, large charge-discharge capacity and excellent cycle performance, and can be applied to the consumption field with requirements on high capacity and high safety.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a metal solid solution modified high-nickel ternary cathode material and a preparation method thereof. Background technique [0002] As a new and clean energy storage device, lithium-ion batteries are increasingly favored by the public and related technical personnel in portable digital products, new energy vehicles and large-scale energy storage power stations. Generating and developing lithium-ion batteries with low toxicity, low cost and high capacity is becoming a focus in the field of electrochemical energy storage. The main cost and performance bottleneck of lithium-ion batteries lies in the internal materials of the battery, including positive electrodes, negative electrodes, electrolytes and separators. Among the four main materials, the quality of the positive electrode material is the key to limit the performance of lithium-ion batteries. ...

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Problems solved by technology

[0005] In view of this, the present application provides a metal solid solution modified high-nickel ternary positive electrode material and its preparation method to solve the problem in the prior art that the electrochemical performance of the high-nickel ternary positive electrode material is reduced due to the extraction of lithium and the enhancement of surface alkalinity. And safety performance is low, which limits its further use, and the process steps are complicated, the preparation process is not environmentally friendly, and it is not conducive to the actual production control.

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