Influence of Al and Mn on the electrochemical performance of LiNixCoyM1-x-yO2 as a cathode for lithium-ion batteries

Abstract

Ternary cathode materials possess splendid application prospects in lithium-ion batteries. In this paper, cathode materials of LiNi0.8Co0.1Mn0.1O2 (811), LiNi0.8Co0.1Mn0.05Al0.05O2 (811-Al) and LiNi0.8Co0.15Al0.05O2 (NCA) were prepared by a simple coprecipitation reaction. At the same time, to further explore how to improve the performance of the nickel-rich material, different elements and non-proportional substitutions were used to observe the charge/discharge performance of the battery. The 811 materials were found to have a capacity of 163 mAhg-1 and, after 100 cycles at a rate of 0.1°C, maintained a capacity of 135 mAhg -1, which represented a capacity retention of 82.7 %. On the other hand, the Al-substitution 811 materials were found to have low cycle performance and poor rate performance. These results indicate that Al and Mn in ternary materials have great differences in stabilizing the structure and properties of materials. As a result, the high-energy, high-density lithiumion battery has great development potential at present.