锂离子电池富锂锰基正极材料的研究进展

doi:10.13208/j.electrochem.141042

摘要/Abstract

摘要： 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xLi₂MnO₃·(1-x)LiMO₂（0 < x < 1，M = Mn、Co、Ni…）具有可逆比容量高（240 ~ 280 mAh·g^-1，2.0 ~ 4.8 V）、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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂电极首周期放电比容量277.3 mAh·g^-1，50周期循环后容量272.8 mAh·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.

关键词: 锂离子电池；富锂正极材料；共沉淀法； xLi₂MnO₃·, (1-x)LiMO₂

Abstract: 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)LiMO₂(M=Mn, Co, Ni...), have become the hot topic and drawn attentions of scholars worldwide because of their high reversible capacity exceeding 240 mAh·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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ prepared in our laboratory shows high initial discharge capacity of 277.3 mAh·g^-1 with 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)LiMO₂.

Key words: Li-ion battery, lithium-rich cathode materials, co-precipitation method, xLi₂MnO₃·(1-x)LiMO₂

中图分类号:

O646

周罗增，徐群杰*，汤卫平，靳雪，袁小磊. 锂离子电池富锂锰基正极材料的研究进展[J]. 电化学（中英文）, 2015, 21(2): 138-144.

ZHOU Luo-zeng, XU Qun-jie*, TANG Wei-ping, JIN Xue, YUAN Xiao-lei. Research Progress of Mn-based Lithium-rich Cathode Materials for Li-ion Batteries[J]. Journal of Electrochemistry, 2015, 21(2): 138-144.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.141042

https://electrochem.xmu.edu.cn/CN/Y2015/V21/I2/138

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