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Toward a reversible Mn⁴⁺/Mn²⁺ redox reaction and dendrite-free Zn anode in near-neutral aqueous Zn/MnO₂ batteries via salt anion chemistry

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dc.contributor.authorZeng, X.
dc.contributor.authorLiu, J.
dc.contributor.authorMao, J.
dc.contributor.authorHao, J.
dc.contributor.authorWang, Z.
dc.contributor.authorZhou, S.
dc.contributor.authorLing, C.D.
dc.contributor.authorGuo, Z.
dc.date.issued2020
dc.description.abstractRechargeable aqueous Zn/MnO₂ batteries are very attractive large-scale energy storage technologies, but still suffer from limited cycle life and low capacity. Here the novel adoption of a near-neutral acetate-based electrolyte (pH ≈ 6) is presented to promote the two-electron Mn⁴⁺/Mn²⁺ redox reaction and simultaneously enable a stable Zn anode. The acetate anion triggers a highly reversible MnO₂/Mn²⁺ reaction, which ensures high capacity and avoids the issue of structural collapse of MnO₂. Meanwhile, the anode-friendly electrolyte enables a dendrite-free Zn anode with outstanding stability and high plating/stripping Coulombic efficiency (99.8%). Hence, a high capacity of 556 mA h g⁻¹, a lifetime of 4000 cycles without decay, and excellent rate capability up to 70 mA cm⁻² are demonstated in this new near-neutral aqueous Zn/MnO2 battery by simply manipulating the salt anion in the electrolyte. The acetate anion not only modifies the surface properties of MnO₂ cathode but also creates a highly compatible environment for the Zn anode. This work provides a new opportunity for developing high-performance Zn/MnO₂ and other aqueous batteries based on the salt anion chemistry.
dc.description.statementofresponsibilityXiaohui Zeng, Jiatu Liu, Jianfeng Mao, Junnan Hao, Zhijie Wang, Si Zhou, Chris D. Ling, and Zaiping Guo
dc.identifier.citationAdvanced Energy Materials, 2020; 10(32):1904163-1-1904163-9
dc.identifier.doi10.1002/aenm.201904163
dc.identifier.issn1614-6832
dc.identifier.issn1614-6840
dc.identifier.orcidMao, J. [0000-0002-4787-4261]
dc.identifier.orcidHao, J. [0000-0002-5777-7844]
dc.identifier.orcidWang, Z. [0000-0002-4745-7548]
dc.identifier.orcidGuo, Z. [0000-0003-3464-5301]
dc.identifier.urihttps://hdl.handle.net/2440/132018
dc.language.isoen
dc.publisherWiley
dc.relation.granthttp://purl.org/au-research/grants/arc/FT150100109
dc.relation.granthttp://purl.org/au-research/grants/arc/LP160101629
dc.relation.granthttp://purl.org/au-research/grants/arc/DP170102406
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101862
dc.rights© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
dc.source.urihttps://doi.org/10.1002/aenm.201904163
dc.subjectAcetate-based electrolytes; dendrite-free Zn anodes; Mn⁴⁺/Mn²⁺ redox reactions; salt anion chemistry; Zn/MnO₂ batteries
dc.titleToward a reversible Mn⁴⁺/Mn²⁺ redox reaction and dendrite-free Zn anode in near-neutral aqueous Zn/MnO₂ batteries via salt anion chemistry
dc.title.alternativeToward a reversible Mn(4+)/Mn(2+) redox reaction and dendrite-free Zn anode in near-neutral aqueous Zn/MnO(2) batteries via salt anion chemistry
dc.typeJournal article
pubs.publication-statusPublished

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