Preparation and Electrochemical Performance of the Ni-Rich Co-Free Cathode Material LiNi<sub>0.94</sub>Mn<sub>0.04</sub>Al<sub>0.02</sub>O<sub>2</sub>
Huiying Kan, Zelong Yang, Qi Meng, Peng Dong, Yingjie Zhang
Abstract
In this paper, Ni-rich Co-free cathode materials, LiNi 0.94 Mn 0.04 Al 0.02 O 2 (NMA), were synthesized by a solid-phase sintering process. The effects of different lithium ratios on the morphology, structure, and electrochemical performance of NMA cathode materials were investigated. The experiments show that NMA-1.03 has the smallest Li + /Ni 2+ mixing and the best crystal structure. The electrochemical performance analysis showed that the initial discharge specific capacity of NMA-1.03 was 199.5 mAh g –1 at 1C, and the capacity retention rate was still 79.89% after 100 cycles. NMA-1.03 also showed excellent rate performance with a discharge specific capacity of 141.9 mAh g –1 at 5C.