Abstract In this work, Ni-based metal-organic framework (MOF) hollow microspheres were firstly grown on the substrate of graphene foam (GF) by a facile solvothermal method, and then the NiO/GF composites were obtained after the calcination of Ni-MOF/GF precursors. The resulting NiO/GF could be employed as free-standing anode electrodes of lithium-ion batteries, showing superior specific capacities and cycling stabilities to pure NiO and GF. In detail, the optimized composite exhibited a capacity of 640 mAh g−1 after 50 cycles at 100 mA g−1. Even at a high current of 1 A g−1, the capacity still reached to ∼330 mAh g−1. The excellent electrochemical performance can be attributed to the synergistic effect between NiO and GF components. The GF matrix not only improves the conductivity of electrode, but also provides a flexible platform for the loading of active materials, preventing the escape and diffusion of NiO particles into the electrolyte during the cycling. Meanwhile, the well-defined hierarchical hollow structure of NiO in the composite effectively mitigates the volume change of metal oxides during the insertion/extraction reaction.

中文翻译：

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轻松合成 MOF 衍生的空心 NiO 微球与石墨烯泡沫相结合以改善锂存储性能

摘要 在这项工作中，首先采用简便的溶剂热法在石墨烯泡沫 (GF) 基底上生长 Ni 基金属有机骨架 (MOF) 空心微球，然后将 NiO/GF 复合材料煅烧后得到 NiO/GF 复合材料。 MOF/GF 前体。所得的 NiO/GF 可用作锂离子电池的独立阳极，表现出优于纯 NiO 和 GF 的比容量和循环稳定性。具体而言，优化的复合材料在 100 mA g-1 下循环 50 次后表现出 640 mAh g-1 的容量。即使在 1 A g-1 的高电流下，容量仍然达到~330 mAh g-1。优异的电化学性能可归因于 NiO 和 GF 组分之间的协同作用。GF基体不仅提高了电极的导电性，但也为活性材料的负载提供了一个灵活的平台，防止了 NiO 颗粒在循环过程中逃逸和扩散到电解质中。同时，复合材料中NiO明确的分层空心结构有效地减轻了金属氧化物在插入/脱出反应过程中的体积变化。