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Fabrication of Mesoporous Graphene@Ag@TiO2 Composite Nanofibers Via Electrospinning as Anode Materials for High-Performance Li-Ion Batteries

    https://doi.org/10.1142/S1793292021501198Cited by:0 (Source: Crossref)

    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.

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