Abstract Transition metal phosphides (TMPs) are prospective anode materials for lithium-ion batteries (LIBs) due to their high theoretical capacities and low redox voltages. Herein, we report a template directing method to develop a tube-sheath hybrid composing of cobalt phosphide particles encapsulated in metal organic frameworks (MOFs) derived N-doped carbon sheaths (CoxP@NC). The utilization of directing template leads to a homogenous distribution of the subsequently formed cobalt phosphide particles, restrains the aggregation of cobalt phosphides, and thus results in the superb rate capability and cyclability. Contributable to the integrated merits of the interior downsized cobalt phosphide particles and the outer ZIF-67 derived porous carbon sheath, the volume expansion during cycling is effectively suppressed. The CoxP@NC hybrid shows superb electrochemical performance as anode material for LIB, with good reversible capacity of 928 mAh·g−1 after 100 cycles at 0.1 A g−1, and high stability of 526 mAh·g−1 after 600 cycles at 1.0 A g−1. This work provides a route for rational design of MOF derived carbon-based anode material for LIB, which could also be applied as a promising platform in diverse field.

中文翻译：

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ZIF-67衍生的碳包裹不连续CoxP纳米管作为高性能锂离子电池负极材料

摘要 过渡金属磷化物 (TMPs) 具有高理论容量和低氧化还原电压，是锂离子电池 (LIBs) 的潜在负极材料。在此，我们报告了一种模板导向方法，以开发由封装在金属有机框架 (MOF) 衍生的 N 掺杂碳鞘 (CoxP@NC) 中的磷化钴颗粒组成的管鞘杂化。导向模板的使用导致随后形成的磷化钴颗粒的均匀分布，抑制了磷化钴的聚集，从而产生了极好的倍率性能和循环性能。得益于内部缩小尺寸的磷化钴颗粒和外部 ZIF-67 衍生多孔碳鞘的综合优点，有效抑制了循环过程中的体积膨胀。CoxP@NC 杂化物作为锂离子电池负极材料显示出优异的电化学性能，在 0.1 A g-1 下循环 100 次后具有 928 mAh·g-1 的良好可逆容量，在 600 次循环后具有 526 mAh·g-1 的高稳定性1.0 A g−1。这项工作为合理设计用于 LIB 的 MOF 衍生的碳基负极材料提供了一条途径，该材料也可以作为一个有前途的平台应用于各个领域。