期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 1, 页码 1065-1075出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03446
关键词
Na-ion batteries; polyanionic positive electrode materials; Na3V2(PO4)(2)F-3; Na-3 (VO)(2)(PO4)(2)F; transport properties; Raman spectroscopy
资金
- Materials Physics and Chemistry Doctoral School of Sorbonne University [ED397]
- Region Nouvelle Aquitaine of the French National Research Agency (STORE-EX Labex Project) [ANR-10-LABX-76-01]
- European Union [875629]
The article presents a series of Na3V2-y3+Vy4+(PO4)(2)F3-yOy compounds as positive electrode materials for sodium-ion batteries, characterizing their structure and properties through chemical analysis, finding that oxygen content affects transport properties, and determining the compound with the best performance.
The series of polyanionic compounds Na3V2-y3+Vy4+(PO4)(2)F3-yOy (0 <= y <= 2) attracts much attention as positive electrode material for Na-ion batteries because of its high operating potential and stable cycling performance. A series of nanospherical Na3V2-y3+Vy4+(PO4)(2)F3-yOy (NVPFOy) materials with y = 0.8, 1.35, 1.6, and 2 were synthesized using a solvothermal reaction, and changes in the vanadium average oxidation state were fully characterized by combining analyses of Raman and infrared spectroscopies and X-ray diffraction. Raman spectroscopy, beyond checking for the absence of a carbon coating, was in fact used for its sensitivity to the vanadium environment and turned out to be an efficient characterization technique to estimate the oxygen content within the Na3V2-y3+Vy4+(PO4)(2)F3-yOy family. The impact of the oxygen content on the transport properties was evaluated by electrochemical impedance spectroscopy. The material with y = 1.35 demonstrates the smallest electrical resistivity in the series as well as the best rate capability and cyclability upon long-term cycling, despite no carbon coating and a high mass loading positive electrode.
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