Structure and electrical properties of sputtered lithium cobaltite thin films

被引:9
|
作者
Rao, KJ
Benqlilou-Moudden, H
Couturier, G
Vinatier, R
Levasseur, A
机构
[1] Inst Chim Mat Condensee Bordeaux, CNRS, F-33607 Pessac, France
[2] Ecole Natl Super Chim & Phys Bordeaux, F-33607 Pessac, France
[3] Ctr Phys Mol Opt & Hertzienne, URA CNRS 283, F-33402 Talence, France
[4] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
关键词
X-ray diffraction; electrical properties; microstructure;
D O I
10.1016/S0025-5408(02)00756-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
LixCoOy films with x < 1 and y > 2 have been prepared by radio-frequency (rf) sputtering from high temperature (HT) LiCoO2 targets. Their structures have been examined with high resolution electron microscopy. Conductivities have been studied between 77 and 400 K. The electrochemical behaviour of film electrodes have been investigated with Li/LiClO4-PC/LixCoOy cells. The annealed films consist of nanocrystalline domains with amorphous boundaries. Electrical conductivities appear to arise from variable-range hopping (VRH) of holes. The films form good electrodes with operating potentials between 2.7 and 3.8 V. The observations have been discussed on the basis of a tentative and heuristic molecular orbital based energy band diagram. (C) 2002 Published by Elsevier Science Ltd.
引用
收藏
页码:1353 / 1367
页数:15
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