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Microstructure and electrochemical properties of the HT-LiCoO2/La2/3–xLi3xTiO3 solid electrolyte interfaces

Published online by Cambridge University Press:  31 January 2011

Kyosuke Kishida ,
Naoyuki Wada ,
Yuji Yamaguchi ,
Haruyuki Inui ,
Masahiko Demura ,
Yasutoshi Iriyama  and
Zempachi Ogumi
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Masahiko Demura
Affiliation:
Fuel Cell Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
Yasutoshi Iriyama
Affiliation:
Department of Materials Science & Chemical Engineering, Shizuoka University, Johoku, Hamamatsu 432-8561, Japan
Zempachi Ogumi
Affiliation:
Department of Energy and Hydrocarbon Chemistry, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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Abstract

Three different types of HT-LiCoO2/lithium lanthanum titanate (LLT) assemblies were produced by depositing an HT-LiCoO2 cathode on polycrystalline LLT with various surface finishes, to investigate the effects of the HT-LiCoO2/LLT interface structure on the electrochemical properties of the assemblies. An amorphous layer is confirmed to be introduced by Ar ion irradiation to crystalline LLT. The HT-LiCoO2/LLT assembly composed of the ion-irradiated LLT exhibits good cycle stability and relatively low apparent interface resistivity. These results indicate that the introduction of an amorphous LLT layer by surface modification of crystalline LLT is very effective in improving the structural stability and lithium-ion conductivity of the interface between HT-LiCoO2 and crystalline LLT.

Keywords

Ionic conductorDefectsTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 8: Materials for Electrical Energy Storage , August 2010 , pp. 1583 - 1587
Copyright
Copyright © Materials Research Society 2010

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References

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