# Unsuccessful Coupling of Weakly Coordinating Anion–Based Mg Salts and Alkoxyalkylamine Solvents for Rechargeable Mg Battery Application: Trace Water‐Driven Interfacial Failure

https://mdr.nims.go.jp/datasets/8f582246-9e03-4753-bb42-29f8dca36171

## File

- [Advanced Science - 2026 - Mandai - Unsuccessful Coupling of Weakly Coordinating Anion Based Mg Salts and Alkoxyalkylamine.pdf](https://mdr.nims.go.jp/filesets/7f847612-69f4-4c99-aac0-ec4e74d68af5/download) ([Detail](https://mdr.nims.go.jp/filesets/7f847612-69f4-4c99-aac0-ec4e74d68af5.md))

## Id

8f582246-9e03-4753-bb42-29f8dca36171

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-10-24T04:51:31.957447Z

## Updated at

2026-10-24T05:05:30.758746Z

## Published at

2026-10-29T01:32:27.230100Z

## Doi



## First published url

https://doi.org/10.1002/advs.76897

## Date published

2026-07-29

## Recorded date published

2026-10

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: 'Unsuccessful Coupling of Weakly Coordinating Anion–Based Mg Salts and Alkoxyalkylamine
    Solvents for Rechargeable Mg Battery Application: Trace Water‐Driven Interfacial
    Failure'
  title_type: original
  lang: en

## Description

- description: Rechargeable magnesium metal batteries (RMMBs) are promising candidates
    for large-scale energy storage owing to the advantageous properties of magnesium
    metal negative electrodes. Recent advances, particularly in electrolyte chemistry,
    have accelerated progress toward practical RMMBs. Here, we combined two emerging
    concepts—weakly coordinating anion (WCA)-based Mg salts and alkoxyalkylamine solvents—in
    electrolyte design. Unexpectedly, the combination of a representative WCA-based
    Mg salt, Mg[Al(Ohfip)4]2, and a conventional alkoxyalkylamine, 2 methoxyethylamine
    (MOEA), resulted in inferior electrochemical performance, whereas MOEA favored
    strongly coordinating anion-based Mg salts such as Mg[TfO]2. Comprehensive electrochemical,
    spectroscopic, and computational analyses revealed distinct anion-dependent solvation
    structures and interfacial chemistries. In Mg[Al(Ohfip)4]2 systems, the anion
    and the solvent complexes are only minimally involved in initial Mg-interface
    formation. Yet, the higher trace water content of MOEA induces the formation of
    unstable oxygen-rich interfaces. In addition, the anion [Al(Ohfip)4]− undergoes
    MOEA-mediated partial hydroxylation. On the contrary, Mg2+, [TfO]⁻ and MOEA form
    associative ion-paired complexes that jointly contribute to the formation of fluorine-
    and nitrogen-rich hybrid interfaces that suppress parasitic reactions and enhance
    performance. Despite these benefits, the associative Mg[TfO]2–MOEA electrolyte
    still exhibits limitations for practical RMMB application. The complex dilemma
    in developing rational electrolyte materials for RMMB applications will also be
    discussed.
  description_type: abstract
  lang: und

## Creator

- name: Toshihiko Mandai
  role: author
  orcid: https://orcid.org/0000-0002-2403-7794
- name: Antoine Barthélemy
  role: author
  orcid: https://orcid.org/0000-0003-1522-3146
- name: Hendrik Koger
  role: author
  orcid: https://orcid.org/0009-0001-9485-9785
- name: Harald Scherer
  role: author
- name: Ingo Krossing
  role: author
  orcid: https://orcid.org/0000-0002-7182-4387

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: Electrolyte
  schema: not_defined
- subject: Magnesium battery
  schema: not_defined
- subject: solvation
  schema: not_defined
- subject: decomposition
  schema: not_defined
- subject: interface
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Advanced Science
  issn: '21983844'
  volume: '13'
  issue: '59'
  article_number: e76897

## Conference



## Related item



## Funding

- identifier: JPMJPF2016
  funder_name: Japan Science and Technology Agency
- identifier: JP26K01623
  funder_name: Japan Society for the Promotion of Science

## 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: 7f847612-69f4-4c99-aac0-ec4e74d68af5
  filename: Advanced Science - 2026 - Mandai - Unsuccessful Coupling of Weakly Coordinating
    Anion Based Mg Salts and Alkoxyalkylamine.pdf
  content_type: application/pdf
  size: 5225184
  md5: 28e99f6a58619612f84f5b94cde293d9

## Thumbnail

fileset_id: 7f847612-69f4-4c99-aac0-ec4e74d68af5
filename: Advanced Science - 2026 - Mandai - Unsuccessful Coupling of Weakly Coordinating
  Anion Based Mg Salts and Alkoxyalkylamine.pdf