High voltage and high capacity lithium-rich material

The lithium-rich manganese-based (xLi[Li1/3-Mn2/3]O2; (1–x) LiMO2, M is a transition metal 0≤x≤1, and the structure is similar to LiCoO2) has a high discharge specific capacity. It is about twice the actual capacity of the cathode material currently used, and is therefore widely studied for lithium battery materials. In addition, since the material contains a large amount of Mn element, it is more environmentally safe and cheaper than LiCoO2 and the ternary material Li[Ni1/3Mn1/3Co1/3]O2. Therefore, xLi[Li1/3-Mn2/3]O2; (1–x) LiMO2 material is considered by many scholars as the ideal material for the next generation of lithium ion battery cathode materials.

At present, the co-precipitation method is mainly used to prepare lithium-rich manganese-based materials, and some researchers use sol-gel method, solid phase method, combustion method, hydrothermal method and other processes to prepare, but the obtained material properties are not as stable as the co-precipitation method.

Although this material has a high specific capacity, there are still several problems in its practical application:

1)The irreversible capacity of the first cycle is up to 40 ~ 100mAh/g;
2)Poor rate capability, 1C capacity under 200mAh/g;
3)High charging voltage causes electrolyte decomposition, making the cycling performance less than ideal.
4)And security issues in use.

By means of metal oxide coating, composite with other anode materials, surface treatment, special structure construction, low upper limit voltage precharge and discharge treatment and other measures, the above problems of lithium-manganese rich materials can be well solved.

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