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.