▎ 摘　　要

This work reports the synthesis and characterization of an amorphous V2O5 cryogel/graphene nanosheet composite as a high-performance cathode material. The optimization of electrode processing is conducted by using the environmentally friendly poly acrylic acid as the binder and ethanol as the solvent. The nanocomposite material shows outstanding capacity values, exceeding 300mAhg(-1) reversible capacity upon galvanostatic cycling tests at 280mAg(-1) (C/2 charge/discharge rate), and more than 100mAhg(-1) at 5600mAg(-1) (10C). A subsequent electrochemical impedance spectroscopy study gives useful insights into the cathode/electrolyte interface.