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Fabrication of Mesoporous Graphene@Ag@TiO2 Composite Nanofibers Via Electrospinning as Anode Materials for High-Performance Li-Ion Batteries
Nano ( IF 1.0 ) Pub Date : 2021-09-08 , DOI: 10.1142/s1793292021501198
M. M. Xia 1 , J. Li 1 , Y. Y. Zhang 1 , D. N. Kang 1 , Y. L. Zhang 1
Affiliation  

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 490.5mAhg1 at 100mAg1 and retained a discharge capacity of 209.1mAhg1 at 100mAg1 after 100 cycles. These results reflect the excellent cycling stability of the material. The average specific discharge capacity of the nanofibers (97.6mAhg1 at 1000mAg1) was two-fold higher than that of samples without graphene, and their discharge capacity returned to 253.8mAg1 (approximately 96.2mAg1 for other nanofibers) when the current density was recovered to the initial value (40mAg1). Electrochemical impedance spectroscopic measurements confirmed that the conductivity of the electrode was 6.3×101Scm1, which is higher than that of bare mesoporous Ag@TiO2 (1.99×105Scm1). Thus, one-dimensional mesoporous graphene@Ag@TiO2 nanofibers can be regarded as a promising anode material for LIBs.

中文翻译:

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-1100G-1并保持放电容量209.1毫安时G-1100G-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-11000G-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253.8G-1(大约96.2G-1对于其他纳米纤维)当电流密度恢复到初始值(40G-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。
更新日期:2021-09-08
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