Progress of Research on the Li-rich Cathode Materials xLi_2MnO_3·(1-x) LiMO_2(M=Co,Fe,Ni_(1/2)Mn_(1/2)…) for Li-ion Batteries

A new generation of Li-rich solid solution materials is cathode material xLi2MnO3.(1?x)LiMO2(M= Co,Fe,Ni1/2Mn1/2…) because of its excellent electrochemical performance.The series of Li-rich cathode material ex-hibits high capacity and excellent cycleability,which may be associated with a new electrochemical charge-discharge mechanism,It is proposed to satisfy the high energy Li-ion batteries.The structure,synthesis methods and electrochemical properties of the Li-rich cathode materials were reviewed in this paper.The factors affecting the electrochemical properties of the cathode materials were discussed,and the recent research progress on improv-ing the electrochemical performance of Li-rich cathode materials was summarized.In addition,the characteristics and the trend of different Li-rich cathode materials were described.