锂离子电池富锂锰基正极材料的研究进展

发布时间：2018-09-17 08:35

【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x Li2Mn O3·(1-x)Li MO2(0x1,M=Mn、Co、Ni…)具有可逆比容量高(240~280 m Ah·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[Li0.2Mn0.54Ni0.13Co0.13]O2电极首周期放电比容量277.3 m Ah·g-1,50周期循环后容量272.8 m Ah·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x Li2Mn O3·(1-x)Li MO2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.
[Abstract]:With the rapid development of new energy sources such as electric vehicles and energy storage power stations, the energy density, power density and cycle life of the next generation of high-performance lithium ion batteries have been put forward higher requirements. Lithium-rich manganese based cathode material x Li2Mn O3 _ (1-x) Li MO2 (0x1H _ 2O _ 2) It has the advantages of high reversible specific capacity (240 ~ 280m Ah g ~ (-1) 2. 8 V), electrochemical performance and low cost. It has attracted the attention of researchers and is expected to be a cathode material for the next generation of lithium ion batteries. In our laboratory, different lithium-rich manganese based cathode materials were prepared by solid phase method and sol-gel method. The specific discharge capacity of Li [Li0.2Mn0.54Ni0.13Co0.13] O _ 2 electrode prepared by sol-gel method was 277.3 m Ah g ~ (-1) 50 cycles, and the capacity of the electrode was 272.8 m Ah g ~ (-1) after 50 cycles, and the capacity retention was 98.4%. In this paper, the structure, synthesis, electrochemical performance modification and charge-discharge mechanism of x Li2Mn O3 (1-x) Li MO2, a new lithium-rich manganese-rich cathode material, are summarized and reviewed.
【作者单位】：上海市电力材料防护与新材料重点实验室上海电力学院;上海空间电源研究所;
【基金】：上海市自然科学基金项目(No.15ZR1418100) 上海市企业自主创新专项项目(No.CXY-2014-24)资助
【分类号】：TM912;TQ131.11

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