Abstract Iron phosphide (FeP) is a promising anode material for Li-ion batteries (LIBs) due to its low cost and high theoretical capacity. To design FeP anode materials with multi-channels for both ions and electrons will greatly help to realize fast ion and electron diffusion and high-rate capability of LIBs, and effectively overcome its intrinsic shortcomings of low conductivity and large volume expansion. Herein, a novel octahedral multi-channel FeP@C/rGO composite has been fabricated by a simple solvothermal process followed by carbonization and phosphorization. The as-prepared FeP@C/rGO composite displays an excellent rate capacity (497 mAh g−1 at 5 A g−1), as well as a high reversible capacity (1080 mAh g−1 at 0.1 A g−1) and superior cyclability with a capacity decay rate of 0.04% per cycle upon 500 cycles. The outstanding electrochemical performance of FeP@C/rGO composite can be attributed to the unique stable carbon octahedral multi-channel frameworks and N/P co-doping interconnect graphene conductive network, which significantly facilitate the Li-ion and electron transfer and accommodate the large volume change during cycling. This work shows a feasible strategy to fabricate FeP-based composites with multi-channels structure as a high-performance anode for lithium-ion batteries.

中文翻译：

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锚定在还原氧化石墨烯纳米片上的多通道 FeP@C 八面体对锂离子电池具有高效性能

摘要 磷化铁（FeP）因其低成本和高理论容量而成为一种很有前途的锂离子电池（LIBs）负极材料。设计具有多通道离子和电子通道的FeP负极材料将极大地有助于实现LIBs的快速离子和电子扩散和高倍率能力，并有效克服其低电导率和大体积膨胀的固有缺点。在这里，一种新型八面体多通道 FeP@C/rGO 复合材料已经通过简单的溶剂热工艺，然后碳化和磷化制成。所制备的 FeP@C/rGO 复合材料显示出优异的倍率容量（5 A g-1 时为 497 mAh g-1），以及高可逆容量（0.1 A g-1 时为 1080 mAh g-1）和优异的循环性能，500 次循环后容量衰减率为 0.04%。FeP@C/rGO 复合材料优异的电化学性能可归因于独特的稳定碳八面体多通道框架和 N/P 共掺杂互连石墨烯导电网络，它们显着促进了锂离子和电子的转移并容纳了大骑行过程中的音量变化。这项工作展示了一种制备具有多通道结构的 FeP 基复合材料作为锂离子电池高性能负极的可行策略。