材料科学
锰
阴极
尖晶石
电化学
离子
锂(药物)
化学工程
相(物质)
金属
扩散
比表面积
冶金
电极
物理化学
热力学
催化作用
有机化学
化学
内分泌学
量子力学
生物化学
工程类
物理
医学
作者
Mengying Cai,Huang Zhang,Yiling Huang,Jian Hua Zou,San-Qiang Shi,Fei Geng
标识
DOI:10.1016/j.ceramint.2020.12.089
摘要
Lithium-rich, manganese-based cathode materials with high specific capacity have become a research focus in recent years; however, the transformation to the spinel phase and the dislocations of the material lead to inferior electrochemical performances. In this work, a lanthanum heterosphere was constructed on the surface of a Li-rich manganese-based material without distinct phase interface and lattice mismatch to address these problems. Such a surface heterosphere can prevent the migration of metal ions and enhance the diffusion of Li+ and transference of electrons. By virtue of the surface heterosphere, which can also preserve the oxygen vacancies, high initial discharge/charge capacities of La-LLO (359.6/293.4 mA h g−1) can also be achieved. The La-LLO cathode also exhibits outstanding cycle performance (236.7 mA h g−1 at 0.1 A g−1 during 100 cycles) and rate capability (59.3 mA h g−1 and the capacity retention of 76.9% for 500 cycles at 5 A g−1). It has been proven that such a melting impregnation method is effective in constructing a surface heterosphere on the surface of a Li-rich manganese-based material for improving Li storage properties.
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