Abstract
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 Ca0.67V8O20 (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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