Tuning Cobalt‐Free Nickel‐Rich Layered LiNi<sub>0.9</sub>Mn<sub>0.1</sub>O<sub>2</sub> Cathode Material for Lithium‐Ion Batteries
Rui Ma, Zhikun Zhao, Jiale Fu, Haijian Lv, Chunli Li, Borong Wu, Daobin Mu, Feng Wu
Abstract
Abstract As the demand for high‐energy‐density batteries becomes more and more urgent, cathode materials of high‐energy lithium‐ion batteries have received widespread attention. LiNi x Co y Mn 1‐ x ‐ y O 2 (NCM) ternary materials with high nickel and low cobalt content as well as a high cut‐off voltage are continually pursued. Here, a nickel‐rich cobalt‐free cathode material, LiNi 0.9 Mn 0.1 O 2 , was synthesized by using a co‐precipitation method to achieve a stable structure and excellent electrochemical performance. It shows a discharge specific capacity of 190 mAhg −1 in the first cycle at a rate of 0.2 C, and a capacity retention of 93 % over 150 cycles at 2.7–4.3 V. It also exhibits excellent electrochemical performance under high cut‐off voltage. The initial discharge specific capacity reaches 197.5 mAhg −1 at 0.2 C within 2.7 to 4.5 V, and the capacity retains 188.9 mAhg −1 after 100 cycles. The work provides an alternative cathode material for high‐energy‐density and cost‐effective lithium‐ion batteries.