57Fe-Mössbauer and XAFS Studies of Conductive Sodium Phospho-Vanadate Glass as a Cathode Active Material for Na-ion Batteries with Large Capacity

S. Kubuki, K. Osouda, A. S. Ali, I. Khan, B. Zhang, Ayuko Kitajou, S. Okada, J. Okabayashi, Z. Homonnay, E. Kuzmann, T. Nishida, L. Pavić, A. Šantić, A. Moguš-Milanković

研究成果: Contribution to journalArticle査読

抄録

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 g1 was recorded for 25NPV glass, suggesting that the sodium phospho-vanadate glass can be used as a good cathode of SIB.

本文言語英語
論文番号120998
ジャーナルJournal of Non-Crystalline Solids
570
DOI
出版ステータス出版済み - 10 15 2021

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 凝縮系物理学
  • 材料化学

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