Wu Qi-Long, Zhao Shi-Xi, Yu Le, Yu Lü-Qiang, Zheng Xiao-Xiao, Wei Guodan
Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, 518055, China.
Dalton Trans. 2019 Sep 14;48(34):12832-12838. doi: 10.1039/c9dt02917f. Epub 2019 Aug 16.
MoO nanobelts with different concentrations of oxygen vacancies were synthesized by a one-step hydrothermal process. XPS test results show that oxygen vacancies are distributed from the exterior to the interior of the MoO nanobelts. As an anode material for lithium-ion batteries, MoO-10 releases excellent rate capacitance. It can maintain a high specific capacitance of about 500 mA h·g at a high current density of 1000 mA·g. In the aspect of cycling stability, MoO-10 can retain a high specific capacity of 641 mA h·g after cycling for 50 times at 100 mA·g and 420 mA h·g after cycling for 100 times at 500 mA·g. The coexistence of oxygen vacancies and low-valence Mo ions is conducive to the intercalation/de-intercalation of Li ions and to promoting redox reactions. It has been proved to be a significantly effective way in which oxygen vacancies can improve the integrated performance of MoO nanobelts as anode materials.
通过一步水热法合成了具有不同氧空位浓度的MoO纳米带。XPS测试结果表明，氧空位从MoO纳米带的外部到内部均有分布。作为锂离子电池的阳极材料，MoO-10展现出优异的倍率电容。在1000 mA·g的高电流密度下，它能保持约500 mA h·g的高比电容。在循环稳定性方面，MoO-10在100 mA·g下循环50次后可保持641 mA h·g的高比容量，在500 mA·g下循环100次后可保持420 mA h·g的比容量。氧空位和低价Mo离子的共存有利于锂离子的嵌入/脱嵌，并促进氧化还原反应。事实证明，氧空位是提高MoO纳米带作为阳极材料的综合性能的一种非常有效的方式。
