3 years ago

Simultaneous Electrospinning and Electrospraying: Fabrication of a Carbon Nanofibre/MnO/Reduced Graphene Oxide Thin Film as a High-Performance Anode for Lithium-Ion Batteries

Simultaneous Electrospinning and Electrospraying: Fabrication of a Carbon Nanofibre/MnO/Reduced Graphene Oxide Thin Film as a High-Performance Anode for Lithium-Ion Batteries
Chao Li, Jianxin Cai, Zhenyu Yang, Fan Wang, Ji Yu
Rational fabrication of flexible thin-film electrodes with superior electrochemical performance is challenging now in consumer electronics miniaturization. In this work, we combine electrospinning with electrospraying in a simultaneous process to achieve the CNFs/MnO/rGO composite film electrodes (CNFs=carbon nanofibres; rGO=reduced graphene oxide) for lithium-ion batteries. For the as-obtained thin-film electrode, the 2D reduced graphene sheets are dispersed on each of the 1D CNFs/MnO composite filaments, in which the nanofibres and rGO nanosheets can form interconnected morphologies simultaneously. The thin-film electrodes with enhanced electrical conductivity and flexibility could efficiently accommodate the volume changes of MnO particles by the very elastic buffer space. As expected, the composite electrode exhibits a high discharge capacity of 1118 mAh g−1 at 0.1 A g−1, and then back to 0.1 A g−1 after 80 cycles, the capacity retention is still up to 98 %; at high rates (e. g. 5 A g−1), the composite is still able to maintain a high reversible capacity of 574 mAh g−1 after 3000 cycles with a significant Coulombic efficiency of 99 %. This is the best specific capacity at 5 A g−1 and longest cycling life reported for MnO thin-film anodes. In addition, the technique provides a facile path to combine 1D fibres/2D nanosheets layer-by-layer in a composite film with tunable fibre diameter. This is the first time that the fabrication of 1D CNFs/MnO fibres and 2D rGO sheet network film electrodes via simultaneous electrospinning and electrospraying methods has been reported. Multi-tasking: A CNF/MnO/rGO thin film (CNF=carbon nanofibre; rGO=reduced graphene oxide) towards a robust, high-performance anode for lithium-ion batteries has been fabricated by simultaneous electrospinning and electrospraying. The conductivity, robustness and flexibility of the film is enhanced, resulting in an obvious improvement of the specific capacity and cycling life for the MnO thin film anodes.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201701012

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