Graphene/V2O5 Cryogel Composite As High Energy Cathode Material For Li-ion Batteries

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