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Pure tetravalent nickel in γ-type nickel oxyhydroxide as secondary battery electrode

Published online by Cambridge University Press:  31 January 2011

Kyoo-Seung Han ,
Masahiro Yoshimura ,
Joo-Byoung Yoon ,
Jin-Ho Choy  and
Kwang-Ja Park
Kyoo-Seung Han
Affiliation:
Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan
Masahiro Yoshimura
Affiliation:
Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226, Japan
Joo-Byoung Yoon
Affiliation:
Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151–742, Korea
Jin-Ho Choy
Affiliation:
Department of Chemistry, Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151–742, Korea
Kwang-Ja Park
Affiliation:
Inorganic Chemistry Division, National Institute of Technology and Quality, 2, Joongang-dong, Kwacheon 427–010, Korea
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Abstract

Pure tetravalent nickel in γ-type cobalt substituted nickel oxyhydroxide, Ni0.70Co0.30O2K0.30(H2O)0.42, could be obtained by the “chimie douce” reaction. The presence of tetravalent nickel is confirmed by comparing the Ni K-edge XANES spectrum of the sample with those of reference compounds having various nickel valency and similar layer structure. The Co K-edge XANES spectrum indicates that the trivalent cobalt remains unchanged regardless of the nickel valency. The structural modification during chimie douce reaction observed from XRD patterns and the result of iodometric titration are consistent with the Ni and Co K-edge XANES data.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 880 - 882
Copyright
Copyright © Materials Research Society 1998

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