Wet-process preparation method of high-nickel single crystal anode material

Abstract

The invention discloses a wet-process preparation method of a high-nickel single crystal anode material. A high-nickel single crystal precursor is directly used as a raw material, a doped element oxide and an oxidant are added into a lithium hydroxide solution system, and a high-nickel single crystal ternary anode material with uniform particle size is obtained through heating reaction, spray drying and high-temperature sintering treatment. The chemical general formula of the ternary anode material is Li1+a(NixCoyMnz)1-bMbO2. Compared with a traditional industrial solid phase synthesis method,the wet-process preparation method of the high-nickel single crystal anode material not only can solve the problem of non-uniformity of mechanical mixing of a precursor and a lithium source, but alsocan effectively reduce the residual alkali content of the high-nickel material, and also can reduce the use amount of the lithium source, thereby reducing the cost and improving the production efficiency. The high-nickel single crystal ternary anode material prepared by the method has the characteristics of uniform composition, complete crystal form, stable structure, excellent electrochemical performance and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a wet method for preparing nickel-rich single crystal positive electrode materials. Background technique [0002] With the country's strong support for the new energy industry, the power battery market has developed rapidly, and battery cathode materials have gradually become one of the main directions of industrialization research. Among them, high-nickel ternary cathode materials rely on high discharge specific capacity (> 200mAh / g ) and low cost have become the focus of the next step of industrialization. Ternary cathode materials can be roughly divided into single crystal materials and polycrystalline materials. Among them, single crystal materials have the characteristics of stable structure and excellent cycle performance, and are favored by power battery manufacturers. [0003] However, high-nickel ternary c...

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Problems solved by technology

[0003] However, high-nickel ternary cathode materials are facing problems such as difficult synthesis and high residual alkali content on the surface of the material.

At present, the traditional preparation method of ternary cathode materials is mainly high-temperature solid-phase sintering method. The high-temperature solid-phase method is simple, but there are defects of uneven mixing of various raw material compounds, and the sintering temperature is high and energy consumption is large.

However, in the traditional synthesis of ternary cathode materials, the practice of excessive lithium in the synthesis, and the higher the nickel content of high-nickel ternary cathode materials, the lower the sintering temperature, which makes the problem of high residual alkali content on the surface of high-nickel ternary cathode materials more prominent. directly affect the performance of the cathode material

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