Facile synthesis of a MoO2–Mo2C–C composite and its application as favorable anode material for lithium-ion batteries
Facile synthesis of a MoO2–Mo2C–C composite and its application as favorable anode material for lithium-ion batteries
复制标题
DOI：
10.1016/j.jpowsour.2016.01.014
复制
发表时间：
2016-03
影响因子：
9.2
通讯作者：
Yanping Zhu;Shaofeng Wang;Yijun Zhong;R. Cai;Li Li-Li;Zongping Shao
中科院分区：
文献类型：
--
作者：
Yanping Zhu;Shaofeng Wang;Yijun Zhong;R. Cai;Li Li-Li;Zongping Shao
MoO2-Mo2C-C 复合材料首次通过简便的离子交换途径制备，作为锂离子电池 (LIB) 的替代阳极材料。大孔肉桂酸阴离子交换树脂与四水钼酸铵在水溶液中相互作用，然后在惰性气体气氛下煅烧产物。树脂和四水合钼酸铵之间的相互作用导致钼在有机碳前体（树脂）上原子级分散，而煅烧过程允许形成 MoO2 和 Mo2C 以及树脂热解为固体碳。根据场发射扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 测量，超细 MoO2 和 Mo2C 纳米颗粒均匀分散，但牢固地附着在无定形碳骨架内。当作为阳极材料进行评估时，合成的样品表现出优异的电化学性能。在0.2 A g−1电流密度下，首次循环放电比容量高达1491 mA h g−1，50次循环后放电比容量高达724 mA h g−1。这种简单、环保、低成本且易于放大的方法，作为下一代锂离子电池负极材料，具有大规模工业化生产MoO2基材料的巨大潜力，具有广泛的应用能力。
A composite of MoO2–Mo2C–C is fabricated through a facile ion-exchange route for the first time as an alternative anode material for lithium-ion batteries (LIBs). A macroporous cinnamic anion-exchange resin interacts with ammonium molybdate tetrahydrate in aqueous solution, and the product is then calcined under an inert gas atmosphere. The interaction between the resin and ammonium molybdate tetrahydrate results in an atomic level dispersion of the molybdenum over the organic carbon precursor (resin), while the calcination process allows the formation of MoO2and Mo2C as well as the pyrolysis of resin to solid carbon. According to field-emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) measurements, ultrafine MoO2and Mo2C nanoparticles are uniformly dispersed but firmly attached within an amorphous carbon framework. When evaluated as an anode material, the as-synthesized sample exhibits superior electrochemical performance. The specific discharge capacity is as high as 1491 mA h g−1in the first cycle and 724 mA h g−1over 50 cycles at a current density of 0.2 A g−1. This simple, environmentally friendly, low-cost and easily scaled up method, has significant potential for mass industrial production of MoO2-based material as next-generation anode material of LIBs with wide application capability.