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Highly Al-substituted C-coated Na3V2-xAlx(PO4)3 compounds with a NASICON structure are synthesized by a single and easily scalable sol-gel route. The effect of the experimental conditions is examined. Their structural, chemical… Click to show full abstract
Highly Al-substituted C-coated Na3V2-xAlx(PO4)3 compounds with a NASICON structure are synthesized by a single and easily scalable sol-gel route. The effect of the experimental conditions is examined. Their structural, chemical and morphological features are described. The first-principles method is used to determine the theoretical voltage vs. Na content profile during Na extraction. The electrochemical Na extraction is characterized by the presence of two plateaus. The first one at ca. 3.4 V is assigned to the V4+/V3+ redox pair, and show a good cyclability. The second plateau at ca. 3.9-4.0 V can be assigned to the V5+/V4+ pair, as evidenced by XPS. This second plateau is less reversible during further discharge.
Journal Title: ACS applied materials & interfaces
Year Published: 2020
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