open access

https://hdl.handle.net/2115/97785

Romanechite, an Asymmetric Tunnel-Type MnO2, for Rechargeable Magnesium Battery Cathodes

英語

nanoparticles

2025-04-08

Wiley-Blackwell

Batteries & Supercaps

8(10)

Rechargeable magnesium batteries are expected to serve as alternatives to lithium-ion batteries due to their advantages in high volumetric energy density, low cost, and safety, associated with using the magnesium metal anode. Tunnel-type manganese dioxides have been intensively explored as cathode materials due to their robust host structure and high operating potential. However, Hollandite (alpha-MnO2), a standard tunnel-type MnO2 having 2 x 2 channels, shows an irreversible structure change during magnesium intercalation, from a symmetric tunnel structure to an asymmetric tunnel structure, due to the deviated Mg site from the tunnel center. Herein, an asymmetric 3 x 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.

学術雑誌論文

Accepted Manuscript

"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 2500118, which has been published in final form at DOI: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."