Vanadium-doped Li2TiSiO5 Anode for Boosting Capacity and Cycling Stability of Lithium-Ion Battery

Abstract

Lithium-ion batteries (LIBs) represent one of the most ideal electrochemical energy storage devices due to their long cycle life, high specific energy, and high-power density. Li2TiSiO5 (LTSO) has been proposed as a promising anode material for LIBs, because of its favorable operating potential of 0.28V vs. Li+/Li, and desired safety and stability. However, its application has been significantly impeded by some key drawbacks, including slow Li+ transfer rates and low electrical conductivity. Herein, we proposed a vanadium (V) -doping engineering for synthesizing Li2Ti1-xVxSiO5 (x = 0, 0.25, 0.5, 0.75) anode via a sol-gel method. Because of the partial replacement Ti4+with V5+ ions in the structure, the as-prepared V-doped Li2Ti0.95V0.05SiO5 shows a high reversible capacity of 235 mAh/g after 130 cycles at a rate of 0.5 A/g, nearly three-folds of that the pristine LTSO anode. In addition, the V-doped anode material demonstrates an excellent rate capability, further highlighting the effectiveness of V-doping engineering of LTSO in terms of enhancing the electrochemical performances to realize real-world application as promising anode materials. This study provides a simple and effective method for fabricating high-performance LTSO anode materials, thus facilitating their practical applications in rechargeable LIBs.