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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number045117
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number4
DOIs
Publication statusPublished - 2011 Jul 14
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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