Abstract Nanostructure design strategies are highly desired in lithium ion batteries due to the attractive properties of nanosizing. Herein, the hollow octahedra ZnFe2O4@C nanocomposites are synthesized through Zn-Fe MOFs as precursor and used as anode materials for lithium ion batteries. Notably, ZnFe2O4@C nanocomposites possess unique structure, where ZnFe2O4 nanoparticles (~20 nm) well scatters in each surface of the hollow octahedra carbon skeleton (~600 nm) and are also confined by coating carbon. This structure efficiently avoids particle agglomeration, buffers volume expansion, facilitates electron transfer and shortens diffusion lengths. Benefiting from above advantages, ZnFe2O4@C exhibits excellent electrochemical performance, including high specific capacity (1780 mAh g−1 at 1A g−1 after 400 cycles), superb rate capability (557 mAh g−1 at 15 A g−1) and ultra-long cycling stability (918 mAh g−1 at 3 A g−1 after 800 cycles). As much, this work may develop an effective nanostructure aiding in designing a variety of metal oxide/carbon composites of interest for energy storage applications.

中文翻译：

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MOF衍生的ZnFe2O4纳米颗粒分散在空心八面体碳骨架中，用于先进锂离子电池

摘要 由于纳米尺寸的吸引力，锂离子电池非常需要纳米结构设计策略。在此，中空八面体 ZnFe2O4@C 纳米复合材料是通过 Zn-Fe MOFs 作为前驱体合成的，并用作锂离子电池的负极材料。值得注意的是，ZnFe2O4@C 纳米复合材料具有独特的结构，其中 ZnFe2O4 纳米粒子（~20 nm）很好地分散在中空八面体碳骨架（~600 nm）的每个表面，并且还受到碳涂层的限制。这种结构有效地避免了粒子团聚，缓冲了体积膨胀，促进了电子转移并缩短了扩散长度。受益于上述优势，ZnFe2O4@C 表现出优异的电化学性能，包括高比容量（1780 mAh g-1，1A g-1 400 次循环后），优异的倍率性能（15 A g-1 时为 557 mAh g-1）和超长循环稳定性（800 次循环后 3 A g-1 时为 918 mAh g-1）。同样，这项工作可能会开发一种有效的纳米结构，有助于设计各种用于储能应用的金属氧化物/碳复合材料。