Hostname: page-component-77c89778f8-n9wrp Total loading time: 0 Render date: 2024-07-23T18:04:57.620Z Has data issue: false hasContentIssue false

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Tabuchi, M., Nakashima, A., Ado, K., Kageyama, H. and Tatsumi, K., Chem. Mater. 17, 4668 (2005).Google Scholar
2. Shikano, M., Tabuchi, M., Sakaebe, H., Kageyama, H., Tatsumi, K., Abstract in the 47th battery symposium in Japan (2006) p.356.Google Scholar
3. Egerton, R. F., Electron Energy-Loss Spectroscopy in the Electron Microscope, 2nd ed. (Plenum Press, New York, 1996).Google Scholar
4. Strobel, P. and Lanbertandron, B., J. Solid State Chem. 75, 90 (1988).Google Scholar
5. Mitome, M., Kohiki, A., Murakawa, Y., Hori, K., Kurashima, K and Bando, Y., Acta Cryst. B 60, 698 (2004).Google Scholar
6. Meng, Y. S., Geder, G., Grey, C. P., Yoon, W.-S., Jiang, M., Bréger, J. and Shao-Horn, Y., Chem. Matter. 17, 2368 (2005).Google Scholar
7. Graetz, J. and Hightower, A. and Ahn, C. C. and Yazami, R. and Rez, P. and Fultz, B., J. Phys. Chem. B 106, 1286 (2002).Google Scholar