Electron delocalization in cyanide-bridged coordination polymer electrodes for Li-ion batteries studied by soft x-ray absorption spectroscopy

Daisuke Asakura, Masashi Okubo, Yoshifumi Mizuno, Tetsuichi Kudo, Haoshen Zhou, Kenta Amemiya, Frank M.F. De Groot, Jeng Lung Chen, Wei Cheng Wang, Per Anders Glans, Chinglin Chang, Jinghua Guo, Itaru Honma

研究成果: Article査読

33 被引用数 (Scopus)

抄録

The electronic structure change during the reversible Li-ion storage reaction in a bimetallic MnFe-Prussian blue analogue (LixK 0.14Mn1.43[Fe(CN)6]•6H2O) was investigated by soft x-ray absorption spectroscopy. The Mn L2,3-edge spectra revealed the unchanged Mn2+ high-spin state regardless of Li-ion concentration (x). On the other hand, the Fe L2,3-edge spectra clearly revealed a reversible redox behavior as Fe3+Fe2+ states with Li-ion insertion/extraction. Experimental findings suggested strong metal-to-ligand charge transfer in conjunction with the ligand-to-metal one. The resulting charge delocalization between the Fe and CN is considered to contribute to the high reversibility of the Li-ion storage process.

本文言語English
論文番号045117
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
84
4
DOI
出版ステータスPublished - 2011 7 14
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
  • 凝縮系物理学

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