Stabilization strategies for high-capacity NCM materials targeting for safety and durability improvements

Layered ternary oxide LiNixCoyMn1-x-yO2 (NCM) cathode materials have attracted intensive academic and commercial interests due to their low cost, good rate capability and high energy density. Unfortunately, for the intrinsic physical and chemical drawbacks during electrochemical processes, the NCM cathodes still suffer from severe performance degradation like voltage fading and capacity deterioration, which extremely limit their practical applications. In this review, we present a critical overview about the stability issue, degradation mechanism, and the strategies reported to improve structural stability and prolong the cycle life of NCM cathodes. To make a better and faster design of highly stable NCM cathode materials for future commercial application, outlook and perspectives are also provided for many important precautions against the shortages of NCM cathodes.