Fabrication of a cyanide-bridged coordination polymer electrode for enhanced electrochemical ion storage ability

Daisuke Asakura, Masashi Okubo*, Yoshifumi Mizuno, Tetsuichi Kudo, Haoshen Zhou, Kazumichi Ikedo, Takashi Mizokawa, Atsushi Okazawa, Norimichi Kojima

*この研究の対応する著者

研究成果: Article査読

83 被引用数 (Scopus)

抄録

Host frameworks with the ability to store guest ions are very important in a wide range of applications including electrode materials for Li-ion batteries. In this report, we demonstrate that the ion storage ability of the cyanide-bridged coordination polymer (Prussian blue analogue, PBA) can be enhanced by suppressing vacancy formation. K-ions in the vacancy-suppressed PBA framework K 1.72Mn[Mn(CN) 6] 0.93·□ 0.07·0.65H 2O (□: a [Mn(CN) 6] 4- defect) were electrochemically extracted. The open circuit voltages (OCVs) during K-ion extraction exhibited two specific plateaus at 3.0 and 3.7 V vs Li/Li +. Ex situ X-ray diffraction and IR spectroscopy revealed drastic structural and electronic changes during K-ion extraction. Furthermore, after K-ion extraction, the vacancy-suppressed PBA framework was applied to the cathode material for a Li-ion battery. The charge/discharge experiments revealed that the framework can accommodate a large amount of Li-ions.

本文言語English
ページ(範囲)8364-8369
ページ数6
ジャーナルJournal of Physical Chemistry C
116
15
DOI
出版ステータスPublished - 2012 4 19
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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