Abstract Molybdenum dioxide (MoO2) suffers from large volume expansion and poor conductivity as anode material for lithium ion battery (LIB). Herein, the three-dimensional (3D) MoO2/N-doped carbon composites constructed by amorphous nanowires and crystalline nanoparticles (marked as 3D MoO2/NC composites) are prepared. It is worth mentioning that the conductivity could be largely improved as well as the volume expansion could be effectively relieved since the structure design including amorphous, carbon-composited and pony-size are taken, resulting in high Li storage capacity of MoO2. Benefiting from the especial structural feature, the 3D MoO2/NC composites exhibit an excellent electrochemical performance compared to the pristine crystalline MoO2 and display a higher capacity of 912 mAh g−1 after 250 cycles at 0.1 A g−1. The proposed structure design can be reference to prepare other electrode materials for boosting the Li storage properties.

中文翻译：

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用无定形纳米线和结晶纳米粒子构建 3D MoO2/N 掺杂碳复合材料以实现高锂存储容量

摘要 二氧化钼（MoO2）作为锂离子电池（LIB）负极材料存在体积膨胀大、导电性差的问题。在此，制备了由非晶纳米线和结晶纳米粒子构成的三维（3D）MoO2/N掺杂碳复合材料（标记为3D MoO2/NC复合材料）。值得一提的是，由于采用了包括非晶、碳复合和小马尺寸在内的结构设计，可以大大提高电导率并有效缓解体积膨胀，从而使MoO2具有较高的锂存储容量。受益于特殊的结构特征，3D MoO2/NC 复合材料与原始结晶 MoO2 相比表现出优异的电化学性能，并在 0.1 A g-1 下循环 250 次后显示出更高的容量，达到 912 mAh g-1。