In Situ K Doped γ-LiV<sub>2</sub>O<sub>5</sub> as Long-Life Anode and Cathode for Lithium Ion Battery
Junfei Ma, Yu Chen, Yinyin Zhang, Ting Song, Xianyou Wang, Xiongwei Wu, Man‐Kay Law, Bei Long
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.