Edge-rich vertical graphene nanosheets templating V2O5 for highly durable zinc ion battery. (February 2021)

• Record Type: Journal Article
• Authors: Zhang, Xiang; Tang, Yachen; He, Pingge; Zhang, Zhao; Chen, Tengfei
• Is Part Of: Carbon. Volume 172(2021)
• Page Start: 207
• Page End: 213
• Publication Date: 2021-02
• Subjects: Zinc-ion battery -- V2O5 -- Vertical graphene -- Edge-rich -- Electrochemical performance; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2020.10.034
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Zinc ion batteries (ZIBs) have attracted increasing attention due to their low cost, high safety and environmental friendliness. However, the simultaneous achievement of long cycle life and high energy density of ZIBs remains an open challenge. In this work, edge-rich cathodes with vertically orientated graphene (VG) nanosheets templating V2 O5 nanosheets are designed for high-performance ZIBs. In such a hybrid structure, free-standing VGs on carbon cloth (CC) with non-aggregated characters, open networks and sharp edges as nanotemplates provide fast electron-transfer channels and large accessible surface area to electrolyte. Moreover, edge-rich Zn nanosheets are deposited on CC as anodes to match with edge-rich V2 O5 /VG/CC cathode. As a result, the assembled aqueous ZIB shows a high capacity of 370 mAh g −1 (at a current density of 0.2 A g −1 ), high rate capability (capacity retention of over 50% at a current density up to 50 A g −1 ) and excellent cycle life (showing a high capacity retention of 85% over 5000 cycles). Graphical abstract: Image 1 Highlights: Edge-rich vertical graphene (VG) acts as high-conductive and large-surface-area nanotemplate. 3D VG network significantly facilitates the electron transfer and hinder the aggregation of V2 O5 nanosheets. Free-standing V2 O5 /VG cathodes exhibit high rate capability and ultralong cycle life.