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Issue 7, 2006
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Electronic and local structural changes in Li2+xTi3O7 ramsdellite compounds upon electrochemical Li-ion insertion reactions by X-ray absorption spectroscopy

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Abstract

Electronic and local structural changes in ramsdellite-type Li2+xTi3O7 compound were investigated by X-ray absorption spectroscopy (XAS) measurements. Upon electrochemical Li-ion insertions, the host lattice with ramsdellite structure is retained, indicated by X-ray powder diffraction. Ti K-edge extended X-ray absorption fine structure (EXAFS) analysis shows, however, slight local structural distortions around Ti ions. The energy shifts and the changes in the peak intensity of Ti K-edge and Ti L-edge XAS reveal the reducing oxidation states of Ti ions as the amount of electrochemically-inserted Li-ion increases. Equally important, oxide ions have a significant effect on the electronic transfer process, suggested by O K-edge XAS. These results on electronic structural changes were interpreted using the Zaanen–Sawatzky–Allen scheme.

Graphical abstract: Electronic and local structural changes in Li2+xTi3O7 ramsdellite compounds upon electrochemical Li-ion insertion reactions by X-ray absorption spectroscopy

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Article information


Submitted
09 Sep 2005
Accepted
18 Nov 2005
First published
07 Dec 2005

Phys. Chem. Chem. Phys., 2006,8, 882-889
Article type
Paper

Electronic and local structural changes in Li2+xTi3O7 ramsdellite compounds upon electrochemical Li-ion insertion reactions by X-ray absorption spectroscopy

W. Ra, M. Nakayama, W. Cho, M. Wakihara and Y. Uchimoto, Phys. Chem. Chem. Phys., 2006, 8, 882
DOI: 10.1039/B512740H

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