Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201902653
Keywords
aqueous Zn batteries; energy storage; layered metal oxide; water-in-salt electrolyte; ZnCl2
Categories
Funding
- Oregon State University
- National Natural Science Foundation of China [51701175]
- National Postdoctoral Program for Innovative Talents [BX201700204]
- China Postdoctoral Science Foundation [2018M630280]
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Zn batteries potentially offer the highest energy density among aqueous batteries that are inherently safe, inexpensive, and sustainable. However, most cathode materials in Zn batteries suffer from capacity fading, particularly at a low current rate. Herein, it is shown that the ZnCl2 water-in-salt electrolyte (WiSE) addresses this capacity fading problem to a large extent by facilitating unprecedented performance of a Zn battery cathode of Ca0.20V2O5 center dot 0.80H(2)O. Upon increasing the concentration of aqueous ZnCl2 electrolytes from 1 M to 30 m, the capacity of Ca0.20V2O5 center dot 0.80H(2)O rises from 296 mAh g(-1) to 496 mAh g(-1); its absolute working potential increases by 0.4 V, and most importantly, at a low current rate of 50 mA g(-1), that is, C/10; its capacity retention increases from 8.4% to 51.1% over 100 cycles. Ex situ characterization results point to the formation of a new ready-to-dissolve phase on the electrode in the dilute electrolyte. The results demonstrate that the Zn-based WiSE may provide the underpinning platform for the applications of Zn batteries for stationary grid-level storage.
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