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Description:

In this work, we introduce a mixed-coordination electrolyte (MCE) combined with a molecular additive (MCE-MA) designed to promote anion-derived interphases and enhance cycling stability in high-voltage RMBs. The MCE formulation integrates dissociative and associative coordinating salts to optimize both Mg2+ transport and interphase formation, while the molecular additive facilitates the development of uniform, robust interphases. MCE-MA exhibits improved Mg plating/stripping efficiency in Cu|Mg asymmetric cells and sustains over 250 hours of stable cycling in Mg|Mg symmetric cells, significantly outperforming conventional halide-free ether-based electrolytes. Furthermore, MCE-MA enables long-term cycling of full cell with oxide-based cathode, achieving 200 cycles at 100 mA g−1. X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were employed systematically to reveal the origin of enhanced performance.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Mg battery, electrolyte, interphase, coordination

Date published: 2026-05-25

Publisher: Wiley

Journal:

• Advanced Science (ISSN: 21983844) vol. 13 issue. 45 e75749

Funding:

• JST JPMJGX23S1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/advs.75749

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Updated at: 2026-08-17 16:44:43 +0900

Published on MDR: 2026-08-17 18:27:59 +0900