Abstract
A mixed-valence V3+/V4+ composite material belonging to the Na3V2O2x(PO4)2F 3-2x/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.
| Original language | English |
|---|---|
| Pages (from-to) | 4917-4925 |
| Number of pages | 9 |
| Journal | Chemistry of Materials |
| Volume | 25 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 23 Dec 2013 |
| Externally published | Yes |
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Keywords
- electrochemistry
- mixed valence sodium vanadium fluorophosphate
- sodium ion batteries
- X-ray diffraction and X-ray absorption near edge structure
ASJC Scopus subject areas
- Materials Chemistry
- Chemical Engineering(all)
- Chemistry(all)
Cite this
Electrochemical Na extraction/insertion of Na3V 2O2x(PO4)2F3-2 x . / Serras, Paula; Palomares, Verónica; Alonso, Javier; Sharma, Neeraj; López Del Amo, Juan Miguel; Kubiak, Pierre; Fdez-Gubieda, María Luisa; Rojo, Teófilo.
In: Chemistry of Materials, Vol. 25, No. 24, 23.12.2013, p. 4917-4925.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electrochemical Na extraction/insertion of Na3V 2O2x(PO4)2F3-2 x
AU - Serras, Paula
AU - Palomares, Verónica
AU - Alonso, Javier
AU - Sharma, Neeraj
AU - López Del Amo, Juan Miguel
AU - Kubiak, Pierre
AU - Fdez-Gubieda, María Luisa
AU - Rojo, Teófilo
PY - 2013/12/23
Y1 - 2013/12/23
N2 - A mixed-valence V3+/V4+ composite material belonging to the Na3V2O2x(PO4)2F 3-2x/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.
AB - A mixed-valence V3+/V4+ composite material belonging to the Na3V2O2x(PO4)2F 3-2x/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.
KW - electrochemistry
KW - mixed valence sodium vanadium fluorophosphate
KW - sodium ion batteries
KW - X-ray diffraction and X-ray absorption near edge structure
UR - http://www.scopus.com/inward/record.url?scp=84896496210&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84896496210&partnerID=8YFLogxK
U2 - 10.1021/cm403679b
DO - 10.1021/cm403679b
M3 - Article
AN - SCOPUS:84896496210
VL - 25
SP - 4917
EP - 4925
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 24
ER -