Structural, magnetic and electrochemical properties of lithium iron orthosilicate

被引：153
|
作者：
Zaghib, K.
Salah, A. Ait
Ravet, N.
Mauger, A.
Gendron, F.
Julien, C. M.
机构：
[1] IREQ, Varennes, PQ J3X 1S1, Canada
[2] Univ Paris 06, UMR 7588, CNRS, Inst Nanosci Paris, F-75015 Paris, France
[3] Univ Montreal, Dept Chim, Montreal, PQ, Canada
来源：
JOURNAL OF POWER SOURCES | 2006年 / 160卷 / 02期
关键词：
lithium batteries; orthosilicate; magnetic properties; optical spectroscopy;
D O I：
10.1016/j.jpowsour.2006.03.023
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：
We report the structural and electronic characterization of Li2FeSiO4 synthesized by solid-state reaction. X-ray diffraction, Raman scattering, Fourier transform infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy and magnetization measurements are analyzed. Magnetic susceptibility experiments give evidence that Li2FeSiO4 powders possess an antiferromagnetic ordering below TN = 25 K due to long range Fe-O-Li-O-Fe interactions. Analysis of the paramagnetic region giving the Curie-Weiss parameters theta(p) = -93.5 K and C-p = 4.13 emu K mol(-1) shows the divalent state of Fe cations. Electron paramagnetic resonance experiments confirm this electronic configuration. Electrochemical measurements were carried out in lithium cells with LiTFSI in a poly(ethylene oxide) (PEO) polymer electrolyte at 80 degrees C. The resulting cyclic voltammogram indicates a stable structure for the first cycle with redox peaks at 2.80 and 2.74 V versus Li-0/Li+. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：1381 / 1386
页数：6
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