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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
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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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References

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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
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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
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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
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