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Description:

We investigate spinel-type MgV2O4 (MVO) as a cathode material and elucidate the correlation between its crystal structure and electrochemical performance. An ordered spinel was synthesized via a solid-state route and subsequently subjected to mechanical milling (MM), while a solvothermal (ST) method was employed to prepare a comparative sample. Rietveld refinement revealed that MM induces a transition from an ordered to a disordered spinel structure, accompanied by partial V occupancy at the interstitial 16c site, which obstructs Mg2+ migration between 8a sites. Despite particle size reduction, MM-MVO exhibited poor reversibility due to
this structural disorder. Complementary computational analysis confirmed the energetic favorability of V migration into the 16c site by MM, explaining the origin of the diffusion barrier. In contrast, ST-MVO retained a relatively ordered structure with minimal V occupation at 16c sites and delivered a reversible capacity of 175 mAh g−1 at 2 V when paired with a high-voltage electrolyte. These findings highlight the critical role of spinel ordering in enabling efficient Mg2+ transport and provide design guidelines for high performance MRB cathodes.

Rights:

• https://creativecommons.org/licenses/by/3.0/
  

Keyword: Rechargeable magnesium batteries, Cathode, Crystal structure, Solvothermal treatment, Mechanical milling

Date published: 2026-02-11

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Journal of Materials Chemistry A (ISSN: 20507488) vol. 14 issue. 18 p. 11057-11064

Funding:

• Japan Science and Technology Agency JPMJGX23S1 (GteX)

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

MDR DOI:

First published URL: https://doi.org/10.1039/d5ta09602b

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Updated at: 2026-03-24 12:59:40 +0900

Published on MDR: 2026-03-24 16:24:16 +0900