Research Progress on the Degradation Mechanism and Cycle Stability Improvement of Lithium-Rich Cathode Materials

The lithium-rich cathode material xLi2Mn03 • (1 - x) LiM02 (M = Ni, Co, Mn, etc., 0 < x <1) has the huge advantages of high capacity (up to 300 mA • h/g or more) and low cost, and is known as probably the most important next-generation cathode material for lithium-ion batteries. It has received great attention and extensive research from various countries. At present, this material still has problems such as low initial (first cycle) Coulomb efficiency, poor cycle performance, and serious voltage attenuation, which all seriously hinder the development and practical application of the material In order to solve these problems of this material, especially its insufficient cycle stability and voltage attenuation, a lot of research work has been carried out on the degradation mechanism and stability improvement of the lithium-rich cathode material, and some important progresses have been made in recent years This article introduces the structure and working principle of the lithium-rich cathode material, focusing on the research work in recent years on the degradation mechanism of the lithium-rich cathode material and improving the stability of the lithium-rich cathode material The further research work has been prospected.