Sustainable Mining and Metallurgy

At present, commercial lithium-ion batteries are limited by the performance bottleneck of cathode materials, and the actual specific capacity is difficult to break through 160 mAh / g, which cannot meet the needs of high energy density batteries in various fields. The development of high-performance cathode materials has become an urgent task in the field of energy materials. In this paper, the lithiumrich manganese-based cathode material xLi ₂MnO₃·(1-x)LiNi _{1 / 3}Co₁ / ₃Mn₁ / ₃O₂ was prepared by modified sol-gel method. By adjusting the heat treatment temperature (600 ℃ , 800 ℃ , 950 ℃ ), holding time (8 h, 9 h, 10 h) and component ratio x value (0. 3,0. 5,0. 7), the regulation mechanism of the preparation process on the crystal structure, microstructure and electrochemical performance of the material was systematically investigated. The experimental results show that when x = 0. 5, the heat treatment temperature is 950 ℃ and the holding time is 10 h, the comprehensive performance of the material is the best: at 0. 1 C rate, the first discharge capacity is 321. 5 mAh / g, the coulombic efficiency is 72. 6% , and the capacity retention rate is 84% after 30 charge-discharge cycles. The optimized process provides technical support for the industrial application of lithium-rich manganese-based materials and is of great significance for promoting the development of high-capacity lithium-ion batteries.