Maximized crystal water content and charge-shielding effect in layered vanadate render superior aqueous zinc-ion battery

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dc.contributor.authorYu, H.
dc.contributor.authorAakyiir, M.
dc.contributor.authorXu, S.
dc.contributor.authorWhittle, J.D.
dc.contributor.authorLosic, D.
dc.contributor.authorMa, J.
dc.date.issued2021
dc.description.abstractEmerging as a promising candidate for grid-scale energy storage, aqueous zinc-ion batteries are challenged by both sluggish Zn²⁺ migration kinetics and poor cyclic stability of cathode materials. Herein, a maximized crystal water content of 14.8 wt% is reported for layered Na₅V₁₂O₃₂·11.9H₂O as the new cathode material. Such a content has enlarged the lattice space up to 12.75 Å providing spacious channels for rapid Zn²⁺ migration. The charge-shielding effect of crystal water alleviates the electrostatic interactions between Zn²⁺ and the cathode framework, enhancing ionic conductivity. The density functional theory calculation reveals that the high crystal water content facilitates the electrical conductivity. These should promote the Zn²⁺ migration kinetics and cyclic stability. Through characterizations by ex situ X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure analysis, the high crystal water content is found to associate with two-electron redox reactions during Zn²⁺ (de)intercalation. As a result, the Na₅V₁₂O₃₂·11.9H₂O cathode presents a reversible capacity of 430.52 mA h/g at 0.1 A/g with 103.7% retention of initial capacity over 3,862 cycles at 1 A/g.
dc.description.statementofresponsibilityH. Yu, M. Aakyiir, S. Xu, J.D. Whittle, D. Losic, J. Ma
dc.identifier.citationMaterials Today Energy, 2021; 21:100757-1-100757-8
dc.identifier.doi10.1016/j.mtener.2021.100757
dc.identifier.issn2468-6069
dc.identifier.issn2468-6069
dc.identifier.orcidLosic, D. [0000-0002-1930-072X]
dc.identifier.urihttps://hdl.handle.net/2440/132893
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/IH150100003
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101737
dc.rights© 2021 Elsevier Ltd. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.mtener.2021.100757
dc.subjectIntercalation; cyclic stability; cathode; two-electron redox
dc.titleMaximized crystal water content and charge-shielding effect in layered vanadate render superior aqueous zinc-ion battery
dc.typeJournal article
pubs.publication-statusPublished

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