Electrochemically-induced reversible transition from the tunneled to layered polymorphs of manganese dioxide
- Authors
- Lee, Boeun; Yoon, Chong Seung; Lee, Hae Ri; Chung, Kyung Yoon; Cho, Byung Won; Oh, Si Hyoung
- Issue Date
- Aug-2014
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- SCIENTIFIC REPORTS, v.4
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENTIFIC REPORTS
- Volume
- 4
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25826
- DOI
- 10.1038/srep06066
- ISSN
- 2045-2322
- Abstract
- Zn-ion batteries are emerging energy storage systems eligible for large-scale applications, such as electric vehicles. These batteries consist of totally environmentally-benign electrode materials and potentially manufactured very economically. Although Zn/alpha-MnO2 systems produce high energy densities of 225 Wh kg(-1), larger than those of conventional Mg-ion batteries, they show significant capacity fading during long-term cycling and suffer from poor performance at high current rates. To solve these problems, the concrete reaction mechanism between alpha-MnO2 and zinc ions that occur on the cathode must be elucidated. Here, we report the intercalation mechanism of zinc ions into alpha-MnO2 during discharge, which involves a reversible phase transition of MnO2 from tunneled to layered polymorphs by electrochemical reactions. This transition is initiated by the dissolution of manganese from alpha-MnO2 during discharge process to form layered Zn-birnessite. The original tunneled structure is recovered by the incorporation of manganese ions back into the layers of Zn-birnessite during charge process.
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