Self-Assembled Sandwich-like Vanadium Oxide/Graphene\nMesoporous Composite as High-Capacity Anode Material for Lithium Ion\nBatteries

Abstract

Sandwich-like V₂O₅/graphene mesoporous composite has been synthesized by a facile\nsolvothermal approach. The crystalline structure, morphology, and\nelectrochemical performance of the as-prepared materials have been\ninvestigated in detail. The results demonstrate that the 30–50\nnm V₂O₅ particles are homogeneously anchored\non conducting graphene sheets, which allow the V₂O₅ nanoparticles to be wired up to a current collector through\nthe underlying conducting graphene layers. As an anode material for\nlithium ion batteries, the composite exhibits a high reversible capacity\nof 1006 mAh g^–1 at a current density of 0.5 A g^–1 after 300 cycles. It also exhibits excellent rate\nperformance with a discharge capacity of 500 mAh g^–1 at the current density of 3.0 A g^–1, which is\nsuperior to the performance of the vanadium-based materials reported\npreviously. The electrochemical properties demonstrate that the sandwich-like\nV₂O₅/graphene mesoporous composite could be\na promising candidate material for high-capacity anode in lithium\nion batteries.