Journal
ENERGY STORAGE MATERIALS
Volume 18, Issue -, Pages 10-14Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.08.008
Keywords
Ag0.4V2O5; energy storage mechanisms; metallic Ag matrix; cathode; aqueous zinc-ion battery
Funding
- National Natural Science Foundation of China [51374255, 51572299]
- Innovation-Driven Project of Central South University [2018CX004]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B045]
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Rechargeable aqueous Zinc-ion batteries (ZIBs) are regarded as the promising battery chemistry in stationary grid energy storage applications. Exploration of new zinc storage mechanism concepts is a feasible way to achieve high energy/power density. Herein, for the first time, we demonstrate the combination displacement/intercalation (CDI) reaction mechanism in aqueous ZIBs, as an example in Zn/Ag0.4V2O5 system. Unlike the classical intercalation/deintercalation storage mechanism, the CDI reaction mechanism enables more Zn2+ ions insertion into the host structure in two different sites, i.e. most of Ag+ in Ag0.4V2O5 replaced by Zn2+, and classical intercalation of Zn2+ in Ag0.4V2O5 and Zn-2(V3O8)(2). Importantly, the in-situ generation of highly conductive Ag-0 matrix within the electrode provides high electronic conductivity. As a result, the Ag0.4V2O5 cathode performs excellent rate capability as well as long-term cycling performance (stable capacity of 144 mA h g(-1) after 4000 cycles at 20 A g(-1)).
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