A high-capacity and long-life aqueous rechargeable zinc battery using a metal oxide intercalation cathode

Dipan Kundu, Brian D. Adams, Victor Duffort, Shahrzad Hosseini Vajargah and Linda F. Nazar ()
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Dipan Kundu: University of Waterloo
Brian D. Adams: University of Waterloo
Victor Duffort: University of Waterloo
Shahrzad Hosseini Vajargah: University of Waterloo
Linda F. Nazar: University of Waterloo

Nature Energy, 2016, vol. 1, issue 10, 1-8

Abstract: Abstract 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⋅nH2O), 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 ∼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.

Date: 2016
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DOI: 10.1038/nenergy.2016.119

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