Journal
JOURNAL OF POWER SOURCES
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229811
Keywords
Sodium-ion batteries; Cathode material; NASICON
Funding
- Ministerio de Ciencia e Innovacion (MICINN) [MAT2017-84002-C2-1-R]
- ERDF funds
- Junta de Andalucia
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Several samples of the Na4-xMn1-xCrxV(PO4)3 series were prepared by a sol-gel method to improve electronic conductivity, and their structural, chemical, and morphological properties were analyzed. The partial replacement of Mn by Cr was found to enhance sodium diffusivity, leading to improved reversible extraction of sodium and low interface resistance.
Several samples of the Na4-xMn1-xCrxV(PO4)3 (0 < 1) series are prepared by a sol-gel method that favors the deposition of an in-situ carbon conductive phase to improve the electronic conductivity of these electrode materials. XRD diffraction, electron microscopy, and Raman and XPS spectroscopies are applied to determine their structural, chemical, and morphological properties. Apparent diffusion coefficients of sodium are calculated by different techniques such as cyclic voltammetry, galvanostatic intermittent titration, and impedance spectroscopy. The results reveal the benefit of the partial replacement of Mn by Cr to improve sodium diffusivity, which leads to a net gain in the reversible extraction of sodium at either low and high rates and low interface resistance values for samples with x = 0.6 and 0.8.
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