Nanosized TiO₂ has been actively developed as a low-cost and environment-friendly anode material for lithium-ion batteries (LIBs), but its poor electronic conductivity seriously restricts its practical applications. This drawback is addressed in this work by the fabrication of one-dimensional mesoporous graphene@Ag@TiO₂ composite nanofibers as anode materials for high-performance LIBs. The materials were prepared via electrospinning combined with annealing treatment, and the effects of graphene addition on the microstructure and electrochemical performance of the resulting mesoporous graphene@Ag@TiO₂ nanofibers were investigated in detail. Ag@TiO₂ nanofibers with the optimal amount of graphene displayed a maximum initial discharge capacity of 490.5mAh⋅g−1 at 100mA⋅g−1 and retained a discharge capacity of 209.1mAh⋅g−1 at 100mA⋅g−1 after 100 cycles. These results reflect the excellent cycling stability of the material. The average specific discharge capacity of the nanofibers (97.6mAh⋅g−1 at 1000mA⋅g−1) was two-fold higher than that of samples without graphene, and their discharge capacity returned to 253.8mA⋅g−1 (approximately 96.2mA⋅g−1 for other nanofibers) when the current density was recovered to the initial value (40mA⋅g−1). Electrochemical impedance spectroscopic measurements confirmed that the conductivity of the electrode was 6.3×10−1S⋅cm−1, which is higher than that of bare mesoporous Ag@TiO₂ (1.99×10−5S⋅cm−1). Thus, one-dimensional mesoporous graphene@Ag@TiO₂ nanofibers can be regarded as a promising anode material for LIBs.

中文翻译：

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通过静电纺丝制备介孔石墨烯@Ag@TiO2复合纳米纤维作为高性能锂离子电池的负极材料

纳米TiO ₂作为一种低成本、环保的锂离子电池（LIBs）负极材料已被积极开发，但其较差的电子导电性严重限制了其实际应用。这项工作通过制造一维介孔石墨烯@Ag@TiO ₂复合纳米纤维作为高性能锂离子电池的负极材料来解决这一缺点。材料准备好了通过详细研究了静电纺丝结合退火处理，以及石墨烯的添加对所得介孔石墨烯@Ag@TiO ₂纳米纤维的微观结构和电化学性能的影响。具有最佳石墨烯量的Ag@TiO ₂纳米纤维表现出的最大初始放电容量为490.5毫安时⋅G-1在100嘛⋅G-1并保持放电容量209.1毫安时⋅G-1在100嘛⋅G-1100 次循环后。这些结果反映了材料优异的循环稳定性。纳米纤维的平均比放电容量 (97.6毫安时⋅G-1在1000嘛⋅G-1)比没有石墨烯的样品高两倍，并且它们的放电容量恢复到253.8嘛⋅G-1（大约96.2嘛⋅G-1对于其他纳米纤维）当电流密度恢复到初始值（40嘛⋅G-1). 电化学阻抗谱测量证实电极的电导率6.3×10-1小号⋅厘米-1, 高于裸介孔 Ag@TiO ₂ (1.99×10-5小号⋅厘米-1）。因此，一维介孔石墨烯@Ag@TiO ₂纳米纤维可以被认为是一种很有前途的锂离子电池负极材料。