Abstract
Rechargeable aqueous zinc-ion batteries (ZIBs) are regarded as promising devices for large-scale stationary energy storage. However, developing ideal cathode materials confronts great challenges. Herein, a novel graphene oxide (GO)-assisted strategy is proposed to synthesis mesoporous VO2/G nanobelts with abundant oxygen defects for high-performance Zn2+ storage. The oxygen vacancies and mesopores facilitate Zn2+ insertion/extraction process. After an in-situ electrochemical activation at around 1.5 V, the monoclinic VO2 transforms to layered V2O5·nH2O, delivering an extremely high reversible capacity of 731 mAh/g (0.1 A/g). In addition, superior high-rate and cycling performances are also achieved.
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