以电解二氧化锰为锰源,采用球磨法和高温固相法制备了富锂锰基正极材料Li1.2 Mn0.54 Co0.13 Ni0.13 O2.探索了烧结温度对富锂锰基材料结构和性能的影响,确定了最佳温度条件.采用X射线衍射和扫描电子显微镜对所合成的正极材料进行了结构和形貌表征,同时通过充放电测试对材料电化学性能进行了测试.结果表明,在850℃下,以电解二氧化锰为锰源制备的富锂锰基正极材料具有较好的电化学性能,在0.05C、0.1C、0.2C、0.5C和1C下的首次放电比容量为254.8、238.1、217.6、179.9和161.8 mAh/g.在0.2C下循环20次,容量保持率为93.66%,在0.5C下循环50次容量保持率为90.03%,在1C下循环100次容量保持率为88.31%.%A Li-rich cathode material Li1.2 Mn0.54 Co0.13 Ni0.13 O2 was synthesized via ball milling and high-temperature solid state synthesis with electrolytic manganese dioxide as manganese source. The optimal condition was obtained through exploring the effects of sintering temperature on the structure and properties of the Li-rich material. The as-prepared Li-rich cathode material was characterized by X-ray diffraction and scanning electron microscopy. Meanwhile, the electrochemical performance of the Li-rich material was investigated by charge-discharge tests. Results show that under the optimal condition, the Li-rich cathode material prepared from electrolytic manganese dioxide has excellent electrochemical performance. The initial discharge specific capacities are 254.8, 238.1, 217.6, 179.9 and 161.8 mAh/g at 0.05C, 0.1C, 0.2C, 0.5C and 1C, respectively. Furthermore, the obtained Li-rich cathode material shows excellent cycling performance with capacity retention of 93. 66% at 0. 2C after 20 cycles, 90. 03% at 0. 5C after 50 cycles and 88.31% at 1.0C after 100 cycles.
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