Preparation and Electrochemical Performance of the Ni-Rich Co-Free Cathode Material LiNi_0.94Mn_0.04Al_0.02O₂

In this paper, Ni-rich Co-free cathode materials, LiNi0.94Mn0.04Al0.02O2 (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+/Ni2+ 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.