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To identify the key factors for achieving high-voltage MRBs, this study investigates ether-based weakly coordinating anion (WCA) electrolytes— Mg[B(OCH(CF3)2)4]2 (BHFIP) and Mg[Al(OCH(CF3)2)4]2 (AlHFIP)—under varying water content to elucidate their electrochemical behavior on carbon-coated Al current collectors and MnO2 cathodes. The two electrolytes are found to exhibit different characteristics in moisture, but as a common conclusion, trace water can promote electrolyte decomposition and CEI formation. Ultimately, the BHFIP electrolyte designed with a low water content successfully enables reversible Mg||MnO2 cells cycling under high voltage (4 V cut-off, > 50 cycles) by mitigating side reactions, whereas higher water content accelerates solvent/anion decomposition and MnO2 dissolution. The work highlights trace water content as a critical factor in ether-based MRB’s electrolyte design, demonstrating that optimized BHFIP electrolytes have potential in stabilizing high-voltage MRBs while emphasizing the need for moisture-resistant functional materials to enhance battery performance.

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  This is the peer reviewed version of the following article: R. Zhu, T. Yabu, C. Yang, H. Yang, A. Nasu, T. Mandai, M. Matsui, H. Kobayashi, Decoding Cathode-Electrolyte Interface Issues in Conventional Ethers Electrolytes-Based Magnesium Rechargeable Batteries. Adv. Energy Mater. 2025, 15, 2502050, which has been published in final form at https://doi.org/10.1002/aenm.202502050. 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: magnesium rechargeable batteries, current collector corrosion, electrolyte decomposition, trace water, weakly coordinating anion

Date published: 2025-05-19

Publisher: Wiley

Journal:

• Advanced Energy Materials (ISSN: 16146832) vol. 15 issue. 31 2502050

Funding:

• Japan Science and Technology Agency JPMJGX23S1
• Japan Society for the Promotion of Science 23K13816

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5731

First published URL: https://doi.org/10.1002/aenm.202502050

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Updated at: 2025-09-05 13:26:03 +0900

Published on MDR: 2026-08-19 08:27:02 +0900