Cathode properties of amorphous and crystalline FePO4

Shigeto Okada, Takafumi Yamamoto, Yasunori Okazaki, Jun Ichi Yamaki, Masahiro Tokunaga, Tetsuaki Nishida

研究成果: ジャーナルへの寄稿学術誌査読

102 被引用数 (Scopus)

抄録

FePO4 is an attractive rare-metal-free cathode active material. Simple and inexpensive new synthesis routes obtained from solution were investigated. P2O5 and Fe metal powders, both of which react in water at room temperature, were selected as inexpensive starting materials. Amorphous powders obtained through ball milling were annealed at various temperatures (100-650 °C) in air. IR spectra showed that PO 4 tetrahedra units existed even in the amorphous matrix. XRD peaks of the trigonal FePO4 phase appeared above 500 °C. Reversible Fe3+/Fe2+ redox reactions in the amorphous and crystalline FePO4 were confirmed by 57Fe Mössbauer spectroscopy. The heating temperature dependence of the cathode properties is reported.

本文言語英語
ページ(範囲)570-574
ページ数5
ジャーナルJournal of Power Sources
146
1-2
DOI
出版ステータス出版済み - 8月 26 2005

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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