Metal oxides are arguably a promising solution to next‐generation high‐energy‐density anode materials. In particular, molybdenum oxides own high theoretical specific capacity (1117 and 838 mA h g⁻¹ for MoO₃ and MoO₂, respectively), high chemical stability, and low cost. The low electronic conductivity of MoO₃ limits their charge–discharge rate performances and delithiation capability. By controlling the valence state of MoO_x with carbon, partial MoO₃ can be reduced to MoO₂ with low electrical resistance and high‐rate capacity. Nonetheless, both molybdenum oxides undergo large‐volume expansion/shrinkage and even pulverization in the lithiation/delithiation process. Herein, through a facile pyrolysis method a MoO_x/N‐doped carbon nanotube (NCNT) anode with controllable valence states of Mo is designed. The high conductivity and flexibility of the NCNT matrix form a stable MoO₂/MoO₃ anode with finely matched lattices and coordinated 3d electrons. Owing to molecularly close contact between electron‐rich CNTs and MoO_x, MoO_x/NCNTs own a high conductivity of 0.36 S cm⁻¹, and mitigate the volume expansion in charges and discharges. The MoO₃/MoO₂/NCNTs anode delivers an unparalleled high gravimetric capacity of 970 mA h g⁻¹, over 100‐cycle stability and high rate capability.

中文翻译：

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电子基体中具有独特价态的金属氧化物可为锂离子电池提供稳定的高容量阳极

金属氧化物可以说是下一代高能量密度阳极材料的有前途的解决方案。特别地，氧化钼具有高的理论比容量（分别对于MoO ₃和MoO ₂分别为1117和838 mA hg ^-1），高化学稳定性和低成本。MoO ₃的低电子电导率限制了它们的充放电速率性能和脱锂能力。通过用碳控制MoO _x的价态，可以将部分MoO ₃还原为MoO ₂具有低电阻和高倍率容量。尽管如此，两种钼氧化物在锂化/脱锂过程中都经历了大体积的膨胀/收缩甚至粉碎。本文中，通过一种简便的热解方法，设计了具有可控价的Mo价态的MoO _x / N掺杂碳纳米管（NCNT）阳极。NCNT基体的高电导率和柔韧性形成了稳定的MoO ₂ / MoO ₃阳极，阳极具有精细匹配的晶格和3d电子配位。由于富电子的CNT与MoO _x之间的分子紧密接触，MoO _x / NCNT具有0.36 S cm ^-1的高电导率，并减轻了充放电的体积膨胀。MoO ₃/ MoO ₂ / NCNTs阳极可提供无与伦比的970 mA hg ^-1的高重量容量，超过100循环的稳定性和高倍率能力。