# Romanechite, an Asymmetric Tunnel‐Type MnO<sub>2</sub>, for Rechargeable Magnesium Battery Cathodes

https://mdr.nims.go.jp/datasets/b96fc492-5ddb-4974-bcfb-62d8622ad13c

## File

- [manuscript_plain.docx](https://mdr.nims.go.jp/filesets/34eee0c2-310c-4757-9a85-c7643f3a37c6/download) ([Detail](https://mdr.nims.go.jp/filesets/34eee0c2-310c-4757-9a85-c7643f3a37c6.md))

## Id

b96fc492-5ddb-4974-bcfb-62d8622ad13c

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-10-10T14:37:51.826587Z

## Updated at

2025-10-14T00:29:18.972293Z

## Published at

2026-04-07T23:23:39.458385Z

## Doi

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

## First published url

https://doi.org/10.1002/batt.202500118

## Date published

2025-04-21

## Recorded date published

2025-10

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Romanechite, an Asymmetric Tunnel‐Type MnO<sub>2</sub>, for Rechargeable
    Magnesium Battery Cathodes
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: und

## Creator

- name: Takashi Yabu
  role: author
- name: Reona Iimura
  role: author
- name: Akira Nasu
  role: author
  orcid: https://orcid.org/0009-0002-7779-5721
- name: Toshihiko Mandai
  role: author
  orcid: https://orcid.org/0000-0002-2403-7794
- name: Masaki Matsui
  role: author
  orcid: https://orcid.org/0000-0003-1499-7457
- name: Hiroaki Kobayashi
  role: author
  orcid: https://orcid.org/0000-0001-6705-9515

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: alcohol solution process
  schema: not_defined
- subject: cathode materials
  schema: not_defined
- subject: magnesium batteries
  schema: not_defined
- subject: nanoparticles
  schema: not_defined

## Rights

- description: '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.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-04-08
end_date: 2026-04-09

## Journal

- title: Batteries & Supercaps
  issn: '25666223'
  volume: '8'
  issue: '10'
  article_number: '2500118'

## Conference



## Related item



## Funding

- identifier: JPMJGX23S1
  funder_name: Japan Science and Technology Agency

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 34eee0c2-310c-4757-9a85-c7643f3a37c6
  filename: manuscript_plain.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 2701183
  md5: 1ecf4f53a740e61187113ae434244bd3

## Thumbnail

fileset_id: 34eee0c2-310c-4757-9a85-c7643f3a37c6
filename: manuscript_plain.docx