Oxygen-Vacancy-Reinforced Vanadium Oxide/Graphene Heterojunction for Accelerated Zinc Storage with Long Life Span.

Vanadium trioxide (V O ) cathode has recently aroused intensive interest for aqueous zinc-ion batteries (AZIBs) due to their structural and electrochemical diversities. However, it undergoes sluggish reaction kinetics and significant capacity decay during prolonged cycling. Herein, an oxygen-vacancy-reinforced heterojunction in V O /reduced graphene oxide (rGO) cathode is designed through electrostatic assembly and annealing strategy. The abundant oxygen vacancies existing in V O weaken the electrostatic attraction with the inserted Zn ; the external electric field constructed by the heterointerfaces between V O and rGO provides additional built-in driving force for Zn migration; the oxygen-vacancy-enriched V O highly dispersed on rGO fabricates the interconnected conductive network, which achieves rapid Zn migration from heterointerfaces to lattice. Consequently, the obtained 2D heterostructure exhibits a remarkable capacity of 424.5 mAh g at 0.1 A g , and a stable capacity retention (96% after 5800 cycles) at the fast discharge rate of 10 A g . Besides, a flexible pouch-type AZIB with real-life practicability is fabricated, which can successfully power commercial products, and maintain stable zinc-ion storage performances even under bending, heavy strikes, and pressure condition. A series of quantitative investigation of pouch batteries demonstrates the possibility of pushing pouch-type AZIBs to realistic energy storage market.