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

Abstract

AbstractOne 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 C and 95 mAh g−1 at 20 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 oC, the V2O5 nanosheets can still deliver high capacities of 184 and 158 mAh g−1 at 1 C, respectively, and also exhibit excellent cycling stability.