Porous Si@SiOx@N-Rich Carbon Nanofibers as Anode in Lithium-Ion Batteries under High Temperature

A facile electrospinning technique followed by pre-oxidation and carbonization treatment is adopted to synthesize silicon anode cladded with SiOx layer and N-rich carbon nanofibers (Si@SiOx@NCNFs), in which post-used polyacrylonitrile (PAN) yarn is chosen as single carbon source. As anode in Li-ion batteries, elaborately designed Si@SiOx@NCNFs renders remarkable reversible capacities of 1045 mA h g(-1) at the 500(th) cycle under a current density of 8 A g(-1) at 80 degrees C, and 828 mA h g(-1) after subsequent 500 cycles at 15 A g(-1), mainly ascribed to the distinct hierarchical structure, N-rich nature and enhanced pesudocapacitive behavior. When Si@SiOx@NCNFs is matched with commercial cathode LiFePO4, full cell delivers a stable capacity of 140 mA h g(-1) at 100 mA g(-1), accompanying with an energy density of 455 Wh kg(-1) at 50 degrees C. These conspicuous features undoubtedly enable Si@SiOx@NCNFs to be promising anode materials for high-power lithium-ion battery used in harsh conditions.