Facile and Low-Cost Synthesis of Large-Area Pure V2O5 Nanosheets for High-Capacity and High-Rate Lithium Storage over a Wide Temperature Range

One of the great challenges in the development of next-generation lithium ion batteries is to simultaneously achieve high power and large energy capacity. Herein, large-area pure V2O5 nanosheets are successfully synthesized by a novel and facile dissolution-splitting method using low-cost raw materials. The as-prepared product exhibits enhanced lithium storage properties including high reversible capacity (290 mAh g(-1)), good cycling and rate performance (144 mAh g(-1) at 10 degrees C and 95 mAh g(-1) at 20 degrees C), which can deliver a high power density of 15.6 kW kg(-1) while the energy density remains as high as 260 Wh kg(-1). At low temperatures of 0 and -20 degrees C, the V2O5 nanosheets can still deliver high capacities of 184 and 158 mAh g(-1) at 1 degrees C, respectively, and also exhibit excellent cycling stability.