Mo-doped LiNi0.8Co0.1Mn0.1O2 cathode materials with improved performance for lithium ion batteries

Abstract

The high nickel ternary LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 (NCM811) cathode material has attracted much attention owing to its advantages of high capacity and low price. However, NCM811 suffers from surface side reactions and cation mixing, which results in an unstable crystal structure and lower Coulomb efficiency and capacity in lithium ion batteries. In this work, Mo-doped cathode material NCM811 is effectively synthesized by high-temperature solidification approach. The characterization results show that the doped NCM811 can form a coating layer on the surface, preventing electrolyte side reactions with the electrode. As the cathode for lithium ion batteries, the Mo-doped NCM811 electrode shows an initial discharge capacity of 185.21[Formula: see text]mAh/g and obtains 156.33[Formula: see text]mAh/g with a capacity retention of 84.5% after 100 cycles at 1C. This study provides a simple and reliable method of fabricating high-performance NCM811 cathode materials.