Cobalt-Free Cathode Material LiNi0.9Mn0.05Mg0.05O2 with High Cycle Stability Synthesized by Homogeneous Co-precipitation Method

Abstract

Lithium-ion batteries (LIBs) posses advantages such as higher energy density and cycle performance, making them widely utilized in various battery energy storage devices. However, common cathode materials often contain Co, which is both resource-poor and expensive. Consequently, the research and development of cobalt-free LIBs has become increasingly significant. In this study, the cathode material LiNi0.9Mn0.05Mg0.05O2 (NMM955) was synthesized using homogeneous co-precipitation method, and its electrochemical properties were investigated through structural characterization and electrochemical testing. The results show that NMM955 has high electrochemical performance when calcination temperature is 750℃ and calcination time is 20 h. At 0.1 C, the initial specific discharge capacity is 189.54 mAh/g, and the capacity retention rate after 50 cycles is 98.21%. At 1 C, the initial specific discharge capacity is 150.32 mAh/g, and the capacity retention rate after 100 cycles is 97.01%, which proves that NMM955 provides a feasible strategy for highly stable cyclic cobalt-free ternary cathode materials.