Facile and Low‐Cost Synthesis of Large‐Area Pure V 2 O 5 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 V 2 O 5 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  o C, the V 2 O 5 nanosheets can still deliver high capacities of 184 and 158 mAh g −1 at 1 C, respectively, and also exhibit excellent cycling stability.