Journal
NATURE ENERGY
Volume 1, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NENERGY.2016.119
Keywords
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Funding
- Natural Resources Canada
- NSERC
- Joint Center for Energy Storage Research (JCESR), an Energy Innovation Hub - US Department of Energy (DOE), Office of Science, Basic Energy Sciences
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Although non-aqueous Li-ion batteries possess significantly higher energy density than their aqueous counterparts, the latter can be more feasible for grid-scale applications when cost, safety and cycle life are taken into consideration. Moreover, aqueous Zn-ion batteries have an energy storage advantage over alkali-based batteries as they can employ Zn metal as the negative electrode, dramatically increasing energy density. However, their development is plagued by a limited choice of positive electrodes, which often show poor rate capability and inadequate cycle life. Here we report a vanadium oxide bronze pillared by interlayer Zn2+ ions and water (Zn0.25V2O5 center dot nH(2)O), as the positive electrode for a Zn cell. A reversible Zn2+ ion (de) intercalation storage process at fast rates, with more than one Zn2+ per formula unit (a capacity up to 300 mAh g(-1)), is characterized. The Zn cell offers an energy density of similar to 450 Wh l(-1) and exhibits a capacity retention of more than 80% over 1,000 cycles, with no dendrite formation at the Zn electrode.
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