A Safe High-Performance All-Solid-State Lithium–Vanadium Battery with a Freestanding V₂O₅ Nanowire Composite Paper Cathode

Abstract

The electronic conductivity and structural stability are still challenges for vanadium pentoxide (V₂O₅) as cathode materials in batteries. Here, we report a V₂O₅ nanowire-reduced graphene oxide (rGO) composite paper for direct use as a cathode without any additives for high-temperature and high-safety solid polymer electrolyte [PEO-MIL-53(Al)-LiTFSI] lithium-vanadium batteries. The batteries can show a fast and stable lithium-ion-storage performance in a wide voltage window of 1.0-4.0 V versus Li⁺/Li at 80 °C, in which with an average capacity of 329.2 mAh g^-1 at 17 mA g^-1 and a stable cycling performance over 40 cycles are achieved. The excellent electrochemical performance is mainly ascribed to integration of the electronic conductivity of rGO and interconnected networks of the V₂O₅ nanowires and solid electrolyte. This is a promising lithium battery for flexible and highly safe energy-storage devices.