Abstract
Several samples of the Na3+xMnxV1-xCr(PO4)3 series, in which the Mn/V ratio was allowed to vary from 0 to 1, are structural, chemical, and morphologically characterized using helpful solid-state techniques such as XRD diffraction, electron microscopy, and Raman and XPS spectroscopies. These cathode materials are tested by both galvanostatic and voltammetric methods to unveil their electrochemical response. The intermediate compositions showed a biphasic transition and a combination of the profiles belonging to the end member of the series: V4+/V3+ Mn3+/Mn2+ and Mn 4+/ Mn 3+ redox couples. The correlation of apparent diffusion coefficients and the cell internal resistance allowed us to conclude the beneficial effect of intermediate Mn-V composition (x = 0.4) to optimize the electrochemical performance and kinetic properties in sodium-ion cells.
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