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- W4311751126 abstract "Mg1.33V1.67−xMnxO4 (x = 0.1 ∼ 0.4) was successfully synthesized using a solid-phase method under a high vacuum condition for the first time. The crystal structures of the products were all assigned to a spinel structure with a space group of Fd3̅ m based on the results of the powder X-ray diffraction profiles and those chemical compositions were determined to be uniform by the STEM observation followed by elemental analysis. Charge and discharge cycle tests indicated that the deliverable discharge capacity depends on the cycle number, Mn composition, and working temperature; Mg1.33V1.57Mn0.1O4, i.e., x = 0.1, showed the largest discharge capacity of 256 mAh g−1 at 13th cycles while the initial capacity was only 73 mAh g−1 at 90 °C. The local structure was analyzed based on EXAFS spectra at the V K-edge for the pristine and electrode materials, and the results suggested that Mg1.33V1.57Mn0.1O4 had the smallest lattice distortion due to Mn at 16d sites, and XAFS spectra at the V K-edge indicated the significant change in the oxidation state of V during the charge/discharge cycles. The particularly stable crystal structure and large contribution of charge compensation by V may jointly contribute to the superior charge–discharge property of Mg1.33V1.57Mn0.1O4." @default.
- W4311751126 created "2022-12-28" @default.
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- W4311751126 date "2023-01-01" @default.
- W4311751126 modified "2023-10-13" @default.
- W4311751126 title "Electrochemical properties and crystal and electronic structure changes during charge/discharge of spinel type cathode-materials Mg1.33V1.67-Mn O4 for magnesium secondary batteries" @default.
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- W4311751126 doi "https://doi.org/10.1016/j.jelechem.2022.117064" @default.
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