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Tunnel-type manganese dioxides have been intensively explored as cathode materials due to their robust host structure and high operating potential. However, Hollandite (a-MnO2), a standard tunnel-type MnO2 having 2 × 2 channels, shows an irreversible structure change during magnesium intercalation, from symmetric tunnel structure to asymmetric tunnel structure, due to the deviated Mg site from the tunnel center. Herein, an asymmetric 3 × 2 tunnel-type MnO2, Romanechite, is synthesized using a room-temperature alcohol solution process. The obtained Romanechite has plate-like nanoparticles and exhibits a discharge capacity of 130 mAh g–1 with no significant structure change during the discharge and recharge, demonstrating superior electrochemical magnesium intercalation/extraction efficiency and capacity retention at room temperature operation.

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  This is the peer reviewed version of the following article: Yabu, T., Iimura, R., Nasu, A., Mandai, T., Matsui, M. and Kobayashi, H. (2025), Romanechite, an Asymmetric Tunnel-Type MnO2, for Rechargeable Magnesium Battery Cathodes. Batteries & Supercaps, 8: e202500118, which has been published in final form at https://doi.org/10.1002/batt.202500118. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: alcohol solution process, cathode materials, magnesium batteries, nanoparticles

Date published: 2025-04-21

Publisher: Wiley

Journal:

• Batteries & Supercaps (ISSN: 25666223) vol. 8 issue. 10 2500118

Funding:

• Japan Science and Technology Agency JPMJGX23S1

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5803

First published URL: https://doi.org/10.1002/batt.202500118

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Updated at: 2025-10-14 09:29:18 +0900

Published on MDR: 2026-04-08 08:23:39 +0900