High‐capacity electrode materials have attracted tremendous attention in energy storage systems. However, the large volume expansion always causes breakdown of electrode materials and capacity fading. In this work, we report the preparation of heterogeneous Fe₃O₄/Fe₇S₈/C nanoplates with a high lithium diffusion coefficient and excellent lithium storage performance. The heterogeneous nanoplates can be derived from Fe‐MOF octahedra during the sulfidation process. As an anode for lithium‐ion batteries, the Fe₃O₄/Fe₇S₈/C composite exhibits higher specific capacity and better rate capability than Fe₃O₄/C and Fe₇S₈/C counterparts. The Fe₃O₄/Fe₇S₈/C nanoplates deliver a reversible capacity of 859 mA h g⁻¹ after 100 cycles at 0.1 A g⁻¹. Even at 2 A g⁻¹, a capacity of 549 mA h g⁻¹ can still be remained. The good performances are attributed to the small nanocrystallites, high surface area, and the heterogeneous phase boundaries. The strategy can be potentially applied to other metal oxide/metal sulfide composite phases or even bimetallic sulfides and bimetal oxides for high performance lithium‐ion batteries.

中文翻译：

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硫掺杂碳包裹异质Fe3O4 / Fe7S8 / C纳米板作为锂离子电池的稳定阳极

高容量电极材料在储能系统中引起了极大的关注。但是，大体积膨胀总是导致电极材料击穿和容量衰减。在这项工作中，我们报道了具有高锂扩散系数和优异的锂存储性能的非均质Fe ₃ O ₄ / Fe ₇ S ₈ / C纳米板的制备。异质纳米板可以在硫化过程中衍生自Fe-MOF八面体。作为锂离子电池的负极，Fe ₃ O ₄ / Fe ₇ S ₈ / C复合材料比Fe ₃ O具有更高的比容量和更好的倍率性能₄ / C和Fe ₇ S ₈ / C对应物。Fe ₃ O ₄ / Fe ₇ S ₈ / C纳米板在0.1 A g ^-1下循环100次后可传递859 mA h g ^-1的可逆容量。即使在2 A g ^-1时，仍可以保留549 mA h g ^-1的容量。良好的性能归因于小纳米晶体，高表面积和异质相界。该策略可以潜在地应用于其他金属氧化物/金属硫化物复合相，甚至适用于高性能锂离子电池的双金属硫化物和双金属氧化物。