Controllable synthesis of Li3VO4/N doped C nanofibers toward high-capacity and high-rate Li-ion storage

Abstract Li3VO4 (LVO) is a promising anode material with comprehensive advantages of energy density and safety performance. However, it suffers from unsatisfactory performance correlating with intrinsic poor reaction kinetics. Herein, morphology-controlled synthesis of LVO/N doped C nanofibers (LVO/NC NFs) is successfully realized via a concise electrospinning approach using low-cost raw materials. The designed LVO/NC NFs show excellent reaction kinetics which result in high pseudocapacitive Li-ion storage throughout cycling, giving rise to ultra-high capacity and prominent rate performance. It delivers discharge capacity of 750 mAh g−1 after 400 cycles at 0.2 A g−1, and 545 mAh g−1 after 900 cycles at 2.0 A g−1. After 2 period rate performance testing from 0.2 to 4.0 A g−1 over 170 cycles, the discharge capacity still reverts to 717 mAh g−1 when the current decreases back to 0.2 A g−1. Tuning the reaction kinetics of LVO via facile electrospinning provides a feasible strategy for constructing high-performance LVO-based anode material.