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Unraveling the Dissolution‐Mediated Reaction Mechanism of α‐MnO 2 Cathodes for Aqueous Zn‐Ion Batteries by Kim, Sung Joo; Wu, Daren; Sadique, Nahian; Quilty, Calvin D.; Wu, Lijun; Marschilok, Amy C.; Takeuchi, Kenneth J.; Takeuchi, Esther S.; Zhu, Yimei is a Engineering article available to read on EtoBox.

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lithium-ion batteries due to their use of nonflammable aqueous electrolyte with high ionic conductivity [1,2] and safety. In this regard, aqueous zinc-ion batteries (ZIBs) are appealing owing to the water compatibility (i.e., low redox potential) and high natural abundance of Zn metal. Furthermore, Zn metal possesses high volumetric energy density by allowing multivalent charge transfer, making itself unparalleled as an anode material. [3] Recent studies on aqueous ZIBs using mildly acidic electrolyte have explored the candidate materials for the cathode, mostly focusing on Zn-ion insertion materials including Prussian blue analogues [4,5] and metal-inserted vanadates. [6,7] However, of those reported to date, a family of MnO 2 polymorphs, especially tunnel-type hollandite α-MnO 2 , is considered particularly promising owing to its low cost in synthesis and high energy density. Despite its appealing electrochemistry, however, the exact reaction mechanism of α-MnO 2 has remained controversial. The mechanisms reported so far include classical zincinsertion reaction, [8,9] chemical conversion reaction, [10] and combined reaction via coinsertion of H + and Zn 2+ ions. [11,12] While all

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Author

Kim, Sung Joo; Wu, Daren; Sadique, Nahian; Quilty, Calvin D.; Wu, Lijun; Marschilok, Amy C.; Takeuchi, Kenneth J.; Takeuchi, Esther S.; Zhu, Yimei

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Publons; Wiley (ISSN 1613-6810)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)