Abstract
• The research progress of NCM cathode materials is summarized. • The current problems of NCM cathode materials are systematically analyzed. • The optimization measures for NCM cathode materials are summarized. • The future development directions of NCM cathode materials are proposed. High energy–density lithium-ion batteries are in great demand in daily life, especially in the field of portable electronic equipment and electrical vehicles. Therefore, vigorous research and development of cathode materials with higher energy density to replace traditional ones is of great significance. In particular, compared with other cathode materials, layered lithium nickel cobalt manganese oxides (LiNi x Co y Mn 1-x-y O 2 ) have the advantages of low cost and high specific capacity. However, LiNi x Co y Mn 1-x-y O 2 still has serious problems in internal structure, safety and stability. Herein, the problems of LiNi x Co y Mn 1-x-y O 2 in the charging/discharging process and the research progress for improving their electrochemical performance through modification methods are summarized. The internal reaction mechanism of the battery and possible future development directions are also discussed.
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