A comparison study of MnO2 and Mn2O3 as zinc-ion battery cathodes: an experimental and computational investigation. Issue 24 (19th April 2021)

• Record Type: Journal Article
• Authors: Shen, Hongyuan; Liu, Binbin; Nie, Zanxiang; Li, Zixuan; Jin, Shunyu; Huang, Yuan; Zhou, Hang
• Is Part Of: RSC advances. Volume 11:Issue 24(2021)
• Page Start: 14408
• Page End: 14414
• Publication Date: 2021-04-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra00346a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : MnO2 and Mn2 O3 cathodes for zinc ion batteries were experimentally and computationally explored. Abstract : The high specific capacity, low cost and environmental friendliness make manganese dioxide materials promising cathode materials for zinc-ion batteries (ZIBs). In order to understand the difference between the electrochemical behavior of manganese dioxide materials with different valence states, i.e., Mn(iii ) and Mn(iv ), we investigated and compared the electrochemical properties of pure MnO2 and Mn2 O3 as ZIB cathodes via a combined experimental and computational approach. The MnO2 electrode showed a higher discharging capacity (270.4 mA h g −1 at 0.1 A g −1 ) and a superior rate performance (125.7 mA h g −1 at 3 A g −1 ) than the Mn2 O3 electrode (188.2 mA h g −1 at 0.1 A g −1 and 87 mA h g −1 at 3 A g −1, respectively). The superior performance of the MnO2 electrode was ascribed to its higher specific surface area, higher electronic conductivity and lower diffusion barrier of Zn 2+ compared to the Mn2 O3 electrode. This study provides a detailed picture of the diversity of manganese dioxide electrodes as ZIB cathodes.