Hollow Structured Li<sub>3</sub>VO<sub>4</sub> Wrapped with Graphene Nanosheets in Situ Prepared by a One-Pot Template-Free Method as an Anode for Lithium-Ion Batteries

To explore good anode materials of high safety, high reversible capacity, good cycling, and excellent rate capability, a Li<sub>3</sub>VO<sub>4</sub> microbox with wall thickness of 40 nm was prepared by a one-pot and template-free in situ hydrothermal method. In addition, its composite with graphene nanosheets of about six layers of graphene was achieved. Both of them, especially the Li<sub>3</sub>VO<sub>4</sub>/graphene nanosheets composite, show superior electrochemical performance to the formerly reported vanadium-based anode materials. The composite shows a reversible capacity of 223 mAh g<sup>–1</sup> even at 20C (1C = 400 mAh g<sup>–1</sup>). After 500 cycles at 10C there is no evident capacity fading.