In Situ K Doped γ-LiV₂O₅ as Long-Life Anode and Cathode for Lithium Ion Battery

Abstract

Based on the reaction process (γ′-V2O5 ↔ γ-LiV2O5 ↔ ζ-Li2V2O5 ↔ ω-Li3V2O5), γ-LiV2O5 is potential anode and cathode in a lithium ion battery. However, its poor structural stability during lithiation/delithiation results in unsatisfactory cyclic life. This work reports a low-temperature molten salt method to prepare in situ K doped γ-LiV2O5. With the as-prepared electrode acting as both anode (233 mAh g–1 after 2400 cycles at 1 A g–1) and cathode (128 mAh g–1 after 888 cycles at 0.2 A g–1), experimental results reveal that the K+ doping distinctly improves structural reversibility, demonstrating the superior electrochemical properties of γ-LiV2O5 for becoming an outstanding candidate in lithium ion batteries.