For next generation, lithium-ion batteries (LIBs) developing high capacity anode materials are crucial with increasing demand of large-scale application. Conversion-type anode materials are promising if stable cycling behavior could be achieved. In this work, a nitrogen-doped porous carbon-Fe3O4 (NPC-Fe3O4) nanocomposite is synthesized via a simple and scalable approach. Composite is prepared by pyrolysis of polymer silica hybrid PolyHIPE (high internal phase emulsion) into NPC, and Fe3O4 nanoparticles (NPs) are anchored on its surface via hydrothermal synthesis. As-prepared NPC-Fe3O4 nanocomposite delivers high reversible capacity of around 1001 mAhg−1 at 0.1 Ag−1 current density and rate capabilities and displays excellent cycling stability as high as 95% capacity retention even after 400 cycles. Superior electrochemical performance of NPC-Fe3O4 is attributed to the hierarchical porous structure and nitrogen doping of carbon which shorten the diffusion path of Li+ and provide ample space to prevent aggregation of Fe3O4 nanoparticles.

中文翻译：

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高度耐用的锂离子电池阳极，由嵌入氮掺杂多孔碳中的 Fe3O4 纳米颗粒制成，具有更高的倍率性能

对于下一代，随着大规模应用需求的增加，开发高容量负极材料的锂离子电池（LIB）至关重要。如果可以实现稳定的循环行为，转换型负极材料很有前景。在这项工作中，通过简单且可扩展的方法合成了掺氮多孔碳-Fe3O4（NPC-Fe3O4）纳米复合材料。复合材料是通过将聚合物二氧化硅杂化 PolyHIPE（高内相乳液）热解为 NPC 制备的，Fe3O4 纳米粒子 (NPs) 通过水热合成固定在其表面。所制备的 NPC-Fe3O4 纳米复合材料在 0.1 Ag-1 电流密度和倍率能力下可提供约 1001 mAhg-1 的高可逆容量，并且即使在 400 次循环后仍显示出高达 95% 的优异循环稳定性。