It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO2 anodes during cycling process in battery systems. To address this issue, we design a hybrid structure of N-doped carbon fibers@SnO2 nanoflowers (NC@SnO2) to overcome it in this work. The hybrid NC@SnO2 is synthesized through the hydrothermal growth of SnO2 nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning. The NC is introduced not only to provide a support framework in guiding the growth of the SnO2 nanoflowers and prevent the flower-like structures from agglomeration, but also serve as a conductive network to accelerate electronic transmission along one-dimensional structure effectively. When the hybrid NC@SnO2 was served as anode, it exhibits a high discharge capacity of 750 mAh g−1 at 1 A g−1 after 100 cycles in Li-ion battery and 270 mAh g−1 at 100 mA g−1 for 100 cycles in Na-ion battery, respectively. Electronic supplementary materialThe online version of this article (10.1007/s40820-017-0172-2) contains supplementary material, which is available to authorized users.

MoO 2 @N-doped C nanofibers (MoO 2 @NC NFs) were synthesized by electrospinning with polyacrylonitrile as carbon source. The in situ formed MoO 2 nanocrystals are completely embedded in the carbon nanofibers, which can not only accelerate ion transition, but also act as a buffer to avoid the mechanical degradation of active material due to the volume changes during charge/discharge cycling. When used as the anode material for both Li/Na-ion batteries, the as-synthesized MoO 2 @NC NFs displayed excellent Li + /Na + storage properties. As the anode for Li-ion battery, the MoO 2 @NC NFs display a high discharge capacity of 930 mA h g −1 at a current density of 200 mA g −1 for 100 cycles, and 720 mA h g −1 at a current density of 1 A g −1 for 600 cycles. Moreover, the discharge capacity of 350 mA h g −1 could be realized at a current density of 100 mA g −1 for 200 cycles for Na-ion battery.

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