▎ 摘　　要

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 490.5 mAh.g(-1) at 100 mA.g(-1) and retained a discharge capacity of 209.1 mAh.g(-1) at 100 mA.g(-1) after 100 cycles. These results reflect the excellent cycling stability of the material. The average specific discharge capacity of the nanofibers (97.6 mAh.g(-1) at 1000 mA.g(-1)) was two-fold higher than that of samples without graphene, and their discharge capacity returned to 253.8 mA.g(-1) (approximately 96.2 mA.g(-1) for other nanofibers) when the current density was recovered to the initial value (40 mA.g(-1)). Electrochemical impedance spectroscopic measurements confirmed that the conductivity of the electrode was 6.3 x 10(-1) S. cm(-1), which is higher than that of bare mesoporous Ag@TiO2 (1.99 x 10(-5) S.cm(-1)). Thus, one-dimensional mesoporous graphene@Ag@TiO2 nanofibers can be regarded as a promising anode material for LIBs.