The zinc cobaltite possesses merit of high theoretical specific capacity. However, issues of low conductivity and volume expansion during lithiation and delithiation lead to severe capacity fading. In this work, a porous zinc cobaltite/carbon composite nanofiber is synthesized with a metal–organic frameworks (MOFs) structure through electrospinning, in situ growth, and hydrothermal reaction. The obtained zinc cobaltite/carbon composite nanofibers have an improved specific surface area (90.61 m² g^-1), enabling excellent electrochemical performance as anode materials in Li-ion batteries. Briefly, a high initial discharge capacity of 2468 mAh g^-1 and reversible capacity of 2008 mAh g^-1 after the 200 cycles, and an outstanding rate capability of 937 mAh g^-1 at 2 A g^-1 are achieved. The capacity fading of MOFs–zinc cobaltite/carbon composite nanofibers is significantly improved, which can be attributed to the following reasons: i) the MOFs structure effectively relieve the strain stemming from volume expansion of transition metal; ii) the abundance of mesoporous structure facilitates the electron transport for Li⁺ diffusion rate by shortening the Li-ion diffusion path during lithiation/delithiation process; iii) the carbon nanofibers with excellent conductivity enable efficient conduction efficiency of lithium ions and electrons. The proposed strategy offers a new perspective to prepare high-performance electrode for lithium-ion batteries.

中文翻译：

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用于高锂存储的多孔 MOFs-钴酸锌/碳复合纳米纤维

钴酸锌具有理论比容量高的优点。然而，锂化和脱锂过程中的低电导率和体积膨胀问题导致严重的容量衰减。在这项工作中，通过静电纺丝、原位生长和水热反应合成了具有金属有机骨架（MOFs）结构的多孔钴酸锌/碳复合纳米纤维。所得钴酸锌/碳复合纳米纤维具有提高的比表面积（90.61 m ² g ^-1），可作为锂离子电池负极材料具有优异的电化学性能。简而言之，2468 mAh g ^-1的高初始放电容量和 2008 mAh g ^{-1 的}可逆容量在 200 次循环后，在 2 A g ^-1下实现了 937 mAh g ^-1的出色倍率性能。MOFs-钴酸锌/碳复合纳米纤维的容量衰减显着改善，这可归因于以下原因：i）MOFs结构有效缓解了过渡金属体积膨胀引起的应变；ⅱ）介孔结构的丰度有利于锂电子传输⁺通过缩短期间锂化/去锂化过程中，锂离子的扩散路径的扩散率; iii) 具有优异导电性的碳纳米纤维能够实现锂离子和电子的高效传导效率。所提出的策略为制备高性能锂离子电池电极提供了新的视角。