TY - JOUR
T1 - 57Fe-Mössbauer and XAFS Studies of Conductive Sodium Phospho-Vanadate Glass as a Cathode Active Material for Na-ion Batteries with Large Capacity
AU - Kubuki, S.
AU - Osouda, K.
AU - Ali, A. S.
AU - Khan, I.
AU - Zhang, B.
AU - Kitajou, A.
AU - Okada, S.
AU - Okabayashi, J.
AU - Homonnay, Z.
AU - Kuzmann, E.
AU - Nishida, T.
AU - Pavić, L.
AU - Šantić, A.
AU - Moguš-Milanković, A.
N1 - Funding Information:
One of the co-authors expresses his sincere gratitude for the financial supports by Grant-in-Aid for Scientific Research (B) (No. 15H03882 ) and cooperative research program of "Network Joint Research Center for Materials and Devices: Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials" ( No. 20174036 ). Parts of the synchrotron radiation experiments were performed under the approval of the Photon Factory Program Advisory Committee, KEK (No. 2019G029). L.P., A.S. and A.M.M. would like to acknowledge the Croatian Science Foundation ; project IP-09–2014–5863 .
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/10/15
Y1 - 2021/10/15
N2 - A relationship between local structure and electrical property of xNa2O·10P2O5·(90−x)V2O5 glass (x = 5, 25 and 45 mol%, abbreviated as xNPV) was investigated by means of 57Fe-Mössbauer spectroscopy(FeMS), X-ray absorption fine structure (XAFS), X-ray diffractometry (XRD), impedance spectroscopy (IS), and cathode active performance test of Na-ion battery (SIB). XAFS of xNPV glasses showed that the oxidation number of the vanadium in xNPV glasses was reduced after the heat treatment. FeMS of xNa2O·10P2O5·(89−x)V2O5·57Fe2O3 glass showed a decrease in the isomer shift and quadrupole splitting with an increase of Na2O content. DC conductivity was decreased with increasing Na2O content and the glass samples exhibit electronic conduction which is explained by the polaronic conduction mechanism. The charge-discharge capacity of xNPV glasses showed a larger initial capacity than that of heat-treated samples. A large initial capacity of 184 mAh g−1 was recorded for 25NPV glass, suggesting that the sodium phospho-vanadate glass can be used as a good cathode of SIB.
AB - A relationship between local structure and electrical property of xNa2O·10P2O5·(90−x)V2O5 glass (x = 5, 25 and 45 mol%, abbreviated as xNPV) was investigated by means of 57Fe-Mössbauer spectroscopy(FeMS), X-ray absorption fine structure (XAFS), X-ray diffractometry (XRD), impedance spectroscopy (IS), and cathode active performance test of Na-ion battery (SIB). XAFS of xNPV glasses showed that the oxidation number of the vanadium in xNPV glasses was reduced after the heat treatment. FeMS of xNa2O·10P2O5·(89−x)V2O5·57Fe2O3 glass showed a decrease in the isomer shift and quadrupole splitting with an increase of Na2O content. DC conductivity was decreased with increasing Na2O content and the glass samples exhibit electronic conduction which is explained by the polaronic conduction mechanism. The charge-discharge capacity of xNPV glasses showed a larger initial capacity than that of heat-treated samples. A large initial capacity of 184 mAh g−1 was recorded for 25NPV glass, suggesting that the sodium phospho-vanadate glass can be used as a good cathode of SIB.
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U2 - 10.1016/j.jnoncrysol.2021.120998
DO - 10.1016/j.jnoncrysol.2021.120998
M3 - Article
AN - SCOPUS:85108897118
SN - 0022-3093
VL - 570
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 120998
ER -