ZnMn2O4 nanoparticles (NPs) wrapped by reduced graphene oxide (rGO) were fabricated via a two-step solvothermal method and used as an anode material for lithium-ion batteries (LIBs). Compared to pure ZnMn2O4, the ZnMn2O4 NPs/rGO composites deliver higher capacities of 1230 mAh g−1 and 578 mAh g−1 after 200 cycles at a current density of 100 mA g−1 and 500 mA g−1, respectively. The enhanced electrochemical performance of ZnMn2O4 NPs/rGO composites is mainly attributed to a distinctive structure (ZnMn2O4 NPs surrounded by flexible rGO), which can promote the diffusion of Li+, accelerate the transport of electrons and buffer volume expansion during the Li+ insertion/extraction process. Furthermore, the rGO sheets can effectively prevent the agglomeration of ZnMn2O4 NPs, thus, improving structural stability of the composites. The excellent electrochemical performance indicates that such ZnMn2O4 NPs/rGO composite structure has a great potential for high-performance LIBs.

中文翻译：

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石墨烯包裹的 ZnMn2O4 纳米颗粒作为锂离子电池负极材料具有增强的性能

锌锰2○4由还原氧化石墨烯（rGO）包裹的纳米颗粒（NPs）通过两步溶剂热法制备，并用作锂离子电池（LIBs）的阳极材料。与纯 ZnMn 相比2○4, 锌锰2○4NPs/rGO 复合材料提供 1230 mAh g 的更高容量-1和 578 毫安克-1在 100 mA g 电流密度下循环 200 次后-1和 500 毫安克-1， 分别。ZnMn增强的电化学性能2○4NPs / rGO复合材料主要归因于独特的结构（ZnMn2○4NPs被柔性rGO包围），可以促进Li的扩散+，加速锂过程中电子的传输和缓冲体积膨胀+插入/提取过程。此外，rGO 片材可以有效防止 ZnMn 的团聚。2○4NPs，因此，提高了复合材料的结构稳定性。优异的电化学性能表明这种 ZnMn2○4NPs/rGO复合结构在高性能LIBs方面具有巨大潜力。