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Analysis of Composition and Valence States in Positive Electrode Materials (Fe-Substituted Li2MnO3) for Lithium Ion Batteries by Analytical Transmission Electron Microscopy

Published online by Cambridge University Press:  26 February 2011

Jun Kikkawa ,
Tomoki Akita ,
Mitsuharu Tabuchi ,
Masahiro Shikano ,
Kuniaki Tatsumi  and
Masanori Kohyama
Jun Kikkawa
Affiliation:
j-kikkawa@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
Tomoki Akita
Affiliation:
t-akita@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
Mitsuharu Tabuchi
Affiliation:
m-tabuchi@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
Masahiro Shikano
Affiliation:
shikano.masahiro@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
Kuniaki Tatsumi
Affiliation:
tatsumi-kuniaki@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
Masanori Kohyama
Affiliation:
m-kohyama@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Ubiquitous Energy Devices, 1-8-31 Midorigaoka, Ikeda, 563-8577, Japan
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Abstract

Analytical transmission electron microscopy (ATEM) was applied to investigate local variation of composition of transition metals in each particle of Fe-substituted Li2MnO3, which reveals high specific capacity and high voltage as a positive electrode. Crystal lattice images of primary particles were observed by means of high-resolution TEM (HRTEM), where local composition of Fe and Mn was determined by electron energy-loss spectroscopy (EELS). It was found that there exist both manganese (Mn)-rich and iron (Fe)-rich regions in a primary particle, where concentration of Fe and Mn fluctuates irregularly in nanometer scale. The relationship between composition and crystal structure in each local region is discussed.

Keywords

energy-storageelectron energy loss spectroscopy (EELS)transmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA06-08
Copyright
Copyright © Materials Research Society 2007

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