In situ Raman spectroscopic study of thin-film Li1-xMn2O4 electrodes

被引:25
作者
Anzue, N [1 ]
Itoh, T [1 ]
Mohamedi, M [1 ]
Umeda, M [1 ]
Uchida, I [1 ]
机构
[1] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan
关键词
Li1-xMn2O4; thin-film electrodes; cyclic voltammetry; in situ Raman;
D O I
10.1016/S0167-2738(02)00693-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In order to investigate structural changes in lithium manganese oxide during the insertion and extraction of lithium ions, Raman spectra of thin films of Li1-xMn2O4 produced by electrostatic spray deposition (ESD) were recorded in situ during a voltammetric scan in 1 M LiClO4 in propylene carbonate (PD)/ethylene carbonate (EC) solutions. Five Raman-active bands, as predicted by the theory, were observed for the Li1-xMn2O4 compound. The X-MnO2 phase has a distinct band at 592 cm(-1) and therefore can be clearly recognized from Raman spectra. The changes observed in Raman lines of Li1-xMn2O4 were ascribed to the occurrence of the phase transition of Li1-xMn2O4 electrodes. From the energy-dependence of Raman spectra, it is suggested that each value of x in Li1-xMn2O4 possesses its own electronic band structure. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:301 / 307
页数:7
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