Electrochemical Na Extraction/Insertion of Na3V2O2x(PO4)2F3–2x
Posted on 2013-12-23 - 00:00
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.
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Serras, Paula; Palomares, Verónica; Alonso, Javier; Sharma, Neeraj; Miguel López
del Amo, Juan; Kubiak, Pierre; et al. (2016). Electrochemical Na Extraction/Insertion of Na3V2O2x(PO4)2F3–2x. ACS Publications. Collection. https://doi.org/10.1021/cm403679b
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AUTHORS (8)
PS
Paula Serras
VP
Verónica Palomares
JA
Javier Alonso
NS
Neeraj Sharma
JM
Juan Miguel López
del Amo
PK
Pierre Kubiak
MF
María
Luisa Fdez-Gubieda
TR
Teófilo Rojo