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Mg1.33−yV1.67−x+yMnxO4 was synthesized by a solid-state method. Powder X-ray diffraction analysis indicated that the product crystallized in the spinel structure with space group Fd-3m; inductively coupled plasma atomic emission spectroscopic analysis showed that the composition was close to the nominal composition. Charge–discharge cycle tests showed that the discharge capacity exceeded 180 mAh/g and that the cycle characteristics were reversible up to 20 cycles at 90°C for the composition with x = 0.15, y = 0.1. The electronic structure was analyzed by the maximum entropy method on the basis of Rietveld analysis results. The sample with x = 0.15, y = 0.08 had a lower electron density and Mg insertion was easier than in the samples with x = 0.15, y = 0.1 and y = 0.13. The sample with x = 0.15, y = 0.08 had less distortion at the 16d site than the samples with x = 0.15, y = 0.1 and y = 0.13, and the distortion decreased with increasing V content.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Magnesium secondary batteries, cathode, crystal structure, electronic structure

Date published: 2026-10-20

Publisher: American Chemical Society (ACS)

Journal:

• ACS Omega (ISSN: 24701343) vol. 11 issue. 41 p. 62789-62803

Funding:

• Japan Society for the Promotion of Science 19K05017
• Japan Science and Technology Agency JPMJML2016
• Advanced Low Carbon Technology Research and Development Program JPMJAL1301
• GteX Program Japan JPMJGX23S1

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

MDR DOI:

First published URL: https://doi.org/10.1021/acsomega.6c04483

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Updated at: 2026-10-21 10:32:39 +0900

Published on MDR: 2026-10-23 03:00:01 +0900