Understanding the Role of Graphene in Hydrated Layered V-Oxide Based Cathodes for Rechargeable Aqueous Zn-Ion Batteries | Zendy

Tao Wu | Zendy; Kaiyue Zhu | Zendy; Kevin Huang | Zendy

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Understanding the Role of Graphene in Hydrated Layered V-Oxide Based Cathodes for Rechargeable Aqueous Zn-Ion Batteries

Author(s) -

Tao Wu,

Kaiyue Zhu,

Kevin Huang

Publication year - 2020

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/1945-7111/ab6a87

Subject(s) - graphene , cathode , materials science , oxide , aqueous solution , kinetics , adsorption , conductivity , chemical engineering , ion , chemical physics , nanotechnology , chemistry , organic chemistry , physics , metallurgy , quantum mechanics , engineering

Graphene is commonly used as a performance enhancer for batteries. Other than increasing the electronic conductivity, however, additional performance beneficial mechanisms remain unclear. Herein, we report a combined experimental and theoretical study on the role of graphene nanoplate (GN) in a high-capacity aqueous-ZIB cathode hydrated Ca 0.67 V 8 O 20 (CaVO). The experimental results reveal that the GN does improve the interfacial charge transfer kinetics and affect the stability and capacity of the cathode without changing the bulk property of the cathode. The theoretical results suggest that GN helps enhance Zn-adsorption on the interface, which increases the Zn-coverage and thus promotes faster kinetics.

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