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Direct Fabrication of LiCoO2 Film Electrodes Using Soft Solution-Processing in LiOH Solution at 20 - 200°C

Published online by Cambridge University Press:  10 February 2011

S.W. Song ,
K.S. Han ,
M. Yoshimura ,
Y. Sato  and
A. Tatsuhiro
S.W. Song
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
K.S. Han
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
M. Yoshimura
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan, yoshimu1@rlem.titech.ac.jp
Y. Sato
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kanagawa University
A. Tatsuhiro
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Kanagawa University
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Abstract

Application of Soft Solution-Processing, which is defined by environmentally friendly processing using (aqueous) solution, to the field of rechargeable lithium microbattery has been demonstrated by fabricating LiCoO2 film on the cobalt metal substrate in LiOH solution under hydrothermal condition. The film formation mecahnism could be interpreted in terms of chemical dissolution of cobalt metal plate in LiOH solution at fixed temperature of 20 - 200°C, resulting in the formation of H1−nCoO2 where n value increases with fabrication temperature and precipitation as LiCoO2 by heterogeneous nucleation on the substrate followed by crystal growth. The crystal structure and film properties have been characterized by X-ray diffraction, X-ray photoelectron, micro-Raman spectroscopic and scanning electron microscopic analyses. The films exhibited a good crystallinity despite the low reaction temperature without any postsynthesis annealing. The films prepared under different conditions showed different phase selection such as spinel (Fd3m) or hexagonal (R3-m), surface morphology and film thickness. An electrochemical activity of the LiCoO2 films was evidenced by cyclic voltammogram revealing a good reversibility on Li-intercalation and -deintercalation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 606: Symposium NN – Chemical Processing of Dielectrics, Insulators & Electronic Ceramics , 1999 , 205
Copyright
Copyright © Materials Research Society 2000

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