Porous Si@SiO x @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 ([email protected]x@NCNFs), in which post-used polyacrylonitrile (PAN) yarn is chosen as single carbon source. As anode in Li-ion batteries, elaborately designed [email protected]x@NCNFs renders remarkable reversible capacities of 1045 mA h g−1 at the 500th cycle under a current density of 8 A g−1 at 80°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 [email protected]x@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 °C. These conspicuous features undoubtedly enable [email protected]x@NCNFs to be promising anode materials for high-power lithium-ion battery used in harsh conditions.