Aqueous rechargeable zinc/sodium vanadate batteries with enhanced performance from simultaneous insertion of dual carriers

Rechargeable aqueous zinc-ion batteries are promising energy storage devices due to their high safety and low cost. However, they remain in their infancy because of the limited choice of positive electrodes with high capacity and satisfactory cycling performance. Furthermore, their energy storage me...

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Bibliographic Details
Published in:Nature communications 2018-04, Vol.9 (1), p.1656-11, Article 1656
Main Authors: Wan, Fang, Zhang, Linlin, Dai, Xi, Wang, Xinyu, Niu, Zhiqiang, Chen, Jun
Format: Article
Language:English
Subjects:
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Aqueous solutions
Electrodes
Energy storage
Humanities and Social Sciences
Insertion
multidisciplinary
Performance enhancement
Protons
Rechargeable batteries
Science
Science (multidisciplinary)
Sodium
Sodium compounds
Sodium sulfate
Storage batteries
Sulfates
Vanadate
Vanadates
Zinc
Zinc sulfate
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Summary:Rechargeable aqueous zinc-ion batteries are promising energy storage devices due to their high safety and low cost. However, they remain in their infancy because of the limited choice of positive electrodes with high capacity and satisfactory cycling performance. Furthermore, their energy storage mechanisms are not well established yet. Here we report a highly reversible zinc/sodium vanadate system, where sodium vanadate hydrate nanobelts serve as positive electrode and zinc sulfate aqueous solution with sodium sulfate additive is used as electrolyte. Different from conventional energy release/storage in zinc-ion batteries with only zinc-ion insertion/extraction, zinc/sodium vanadate hydrate batteries possess a simultaneous proton, and zinc-ion insertion/extraction process that is mainly responsible for their excellent performance, such as a high reversible capacity of 380 mAh g –1 and capacity retention of 82% over 1000 cycles. Moreover, the quasi-solid-state zinc/sodium vanadate hydrate battery is also a good candidate for flexible energy storage device. Rechargeable zinc-ion batteries are promising energy storage devices but suffer from the limited choice of positive electrodes. Here Niu and co-workers show a design with sodium vanadate hydrate as cathode, allowing simultaneous proton and zinc-ion insertion/extraction and enhanced performance.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-018-04060-8