锂离子电池富锂锰基正极材料的研究进展

Research Progress of Mn-Based Lithium-Rich Cathode Materials for Li-Ion Batteries

随着新能源如电动汽车、储能电站的蓬勃发展，人们对下一代高性能锂离子电池的能量密度、功率密度和循环寿命提出了更高的要求．而富锂锰基正极材料xLi2Mn03·（1-x）LiM02（O〈x〈1，M=Mn、Co、Ni…）具有可逆比容量高（240～280mAh·g^-1，2．0～4．8V）、电化学性能较佳、成本较低等优点，已吸引了研究者的关注，有望成为下一代锂离子电池用正极材料．本实验室采用固相法和溶胶．凝胶法制备不同的富锂锰基正极材料，其中，溶胶-凝胶法制得的Li[Li0.2Mn0.54Ni0.13C0.13]O2电极首周期放电比容量277．3mAh·g^-1，50周期循环后容量272．8mAh·g^-1，容量保持率98．4％．本文重点结合本实验室的研究工作，对新型富锂锰基正极材料xLi2MnO3·（1-x）LiMO2的结构、合成、电化学性能改性和充放电机理等进行总结与评述．

With rapid development of new energy industry like electric vehicles and energy storage station, these fields highly demand the next generation of high performance Li-ion battery systems with stronger energy density, higher power density, and longer cycling life. Lithium-rich Mn-based cathode materials, xLi2MnO3·（1-x）Li MO2（M = Mn, Co, Ni …）, have become the hot topic and drawn attentions of scholars worldwide because of their high reversible capacity exceeding 240 m Ah·g-1, excellent electrochemical properties, and low cost, which makes them most promising cathode material candidates for next Li-ion battery system.The cathode material Li[Li0.2Mn0.54Ni0.13Co0.13]O2prepared in our laboratory shows high initial discharge capacity of 277.3 m Ah·g-1with retention of 98.4% after 50 cycles. Based on our previous works, we have introduced and reviewed the structures, preparation methods, and charge/discharge mechanisms of these lithium-rich Mn-based cathode materials xLi2MnO3·（1-x）Li MO2.