Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-05T06:55:32.847Z Has data issue: false hasContentIssue false

Influences of Microstructures of the Cathode/Electrolyte Interface on the Electrochemical Properties of All Solid-State Li-ion Batteries

Published online by Cambridge University Press:  26 February 2011

Kyosuke Kishida
Affiliation:
[email protected], Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan, +81-75-753-5481, +81-75-753-5461
Naoyuki Wada
Affiliation:
[email protected], Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Yuji Yamaguchi
Affiliation:
[email protected], Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Katsushi Tanaka
Affiliation:
[email protected], Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Yasutoshi Iriyama
Affiliation:
[email protected], Kyoto University, Department of Energy and Hydrocarbon Chemistry, Nishikyo-ku, Kyoto, 615-8510, Japan
Zempachi Ogumi
Affiliation:
[email protected], Kyoto University, Department of Energy and Hydrocarbon Chemistry, Nishikyo-ku, Kyoto, 615-8510, Japan
Haruyuki Inui
Affiliation:
[email protected], Kyoto University, Department of Materials Science and Engineering, Sakyo-ku, Kyoto, 606-8501, Japan
Get access

Abstract

Two types of samples containing different La2/3-xLi3xTiO3 (LLT) solid electrolyte /LiCoO2 cathode interfaces were prepared by depositing LiCoO2 on polycrystalline LLT with two different surface finishes: cleaved and polished surfaces. Electrochemical properties of the samples were analyzed by cyclic voltammetry (CV). Microstructures of the LLT/LiCoO2 interfaces were investigated by scanning electron microscopy and transmission electron microscopy. Cyclic voltammograms of the cleaved sample show that the anodic and cathodic peaks respectively shift to higher and lower potential with the number of cycles, while those for the polished samples do not change much during cycles of potential sweeps, indicating the higher stability for the polished samples upon insertion and extraction of lithium ion. The LiCoO2 thin-film cathode is epitaxially deposited with the orientation relationships: {110}LLT//{1120}LiCoO2 and <001>LLT//<4401>LiCoO2 for both samples with different geometric configurations of the interfaces to the Li layers in the LiCoO2. Amorphous regions are observed to exist in places at the interface only in the polished samples. The geometric configuration of the interface and the existence of the amorphous regions are considered to have great influences on the stability of the LLT/LiCoO2 interfaces upon charge / discharge operations.

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. Inaguma, Y., Chen, L., Itoh, M., Nakamura, T., Uchida, T., Ikuta, H., and Wakihara, M., Solid State Commun. 86, 689 (1993).Google Scholar
2. Stramare, S., Thangadurai, V., and Weppner, W., Chem. Mater. 15, 3974 (2003).Google Scholar
3. Reimers, J. N. and Dahn, J. R., J. Electrochem. Soc. 139, 2091 (1992).Google Scholar
4. Várez, A., García-Alvarado, F., Morán, E., and Alario-Franco, M. A., J. Solid State Chem. 118, 78 (1995).Google Scholar
5. Fourquet, J. L., Duroy, H., and Crosnier-Lopez, M. P., J. Solid State Chem. 127, 283 (1996).Google Scholar
6. Garcia-Martin, S., Alario-Franco, M. A., Ehrenberg, H., Rodriguez-Carvajal, J., and Amador, U., J. Am. Chem. Soc. 126, 3587 (2004).Google Scholar
7. Kishida, K., Wada, N., Yada, C., Iriyama, Y., Ogumi, Z., Tanaka, K., and Inui, H., unpublished work.Google Scholar
8. Furusawa, S., Tabuchi, H., Sugiyama, T., Tao, S., and Irvine, J. T. S., Solid State Ionics 17, 553 (2005).Google Scholar