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Electrochemical Na extraction/insertion of Na3V2O2x(PO4)2F3-2x

Abstract: A mixed-valence V3+/V4+ composite material belonging to the Na3V2O2x(PO4)2F3-2x/C family is synthesized and the electrochemical Na extraction/insertion mechanism is determined using a combination of high-resolution synchrotron X-ray diffraction (XRD) data, X-ray absorption spectroscopy (XAS), 23Na and 19F solid state nuclear magnetic resonance (NMR), double titration (for the elucidation of the vanadium oxidation state), and electrochemical measurements. The vanadium oxidation state is found to be +3.8 for the as-prepared sample. Detailed analysis of the cathode structural evolution illustrated that the V4+/V5+ couple is active in this compound during electrochemical cycling between 2.8 V and 4.3 V. This study demonstrates how the sodium-ion extraction and insertion pathways in cathode materials can be followed (and verified) using several experimental techniques, especially when multiple potential oxidation states are present in the parent compound.

 Fuente: Chemistry of Materials, 2013, 25(24), 4917-4925

Editorial: American Chemical Society

 Fecha de publicación: 10/12/2013

Nº de páginas: 9

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/cm403679b

ISSN: 0897-4756,1520-5002

Url de la publicación: https://doi.org/10.1021/cm403679b

Autoría

SERRAS, PAULA

PALOMARES, VERÓNICA

SHARMA, NEERAJ

LÓPEZ DEL AMO, JUAN MIGUEL

KUBIAK, PIERRE

FDEZ-GUBIEDA, MARÍA LUISA

ROJO, TEÓFILO