Mössbauer study of LiFeVPOx as a new cathode material for lithium-ion battery

T. Nishida, Y. Yoshida, Y. Takahashi, S. Okada, J. Yamaki

研究成果: ジャーナルへの寄稿学術誌査読

13 被引用数 (Scopus)

抄録

The Mössbauer spectrum of LiFeVPOx , LiFeV 0.5POx and LiFePOx glasses prepared by conventional melt-quenching method for cathode active material is composed of a doublet due to distorted FeIIIO4 tetrahedra. The Mössbauer spectrum of LiFePOx glass has an additional doublet due to distorted FeIIO6 octahedra. Heat treatment of LiFeVPOx and LiFeV0.5POx glasses at a given temperature close to each crystallization temperature causes a marked decrease in the value of Δ, reflecting a decrease in the distortion or an increase in the local symmetry of distorted FeIIIO4 tetrahedra. Heat treatment of LiFeVPOx glass causes an increase in the electric conductivity from the order of 10-7 to 10-3 S·cm-1, together with an increase in the specific discharge-and charge-capacity of a coin-type Li-ion cell from 50 to 150 mAh·g-1. These results prove that structural relaxation of the glass network causes an increase in the electric conductivity and an increase in the energy density of the Li-ion cell.

本文言語英語
ページ(範囲)417-422
ページ数6
ジャーナルJournal of Radioanalytical and Nuclear Chemistry
275
2
DOI
出版ステータス出版済み - 2月 2008

!!!All Science Journal Classification (ASJC) codes

  • 分析化学
  • 原子力エネルギーおよび原子力工学
  • 放射線学、核医学およびイメージング
  • 汚染
  • 分光学
  • 公衆衛生学、環境および労働衛生
  • 健康、毒物学および変異誘発

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