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High-Rate Performance of LiCoO2 Epitaxial Thin Films with Various Surface Conditions

Published online by Cambridge University Press:  04 March 2018

Sou Yasuhara
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Japan
Shintaro Yasui*
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Japan
Tomoyasu Taniyama
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Japan
Mitsuru Itoh
Affiliation:
Laboratory for Materials and Structures, Tokyo Institute of Technology, Japan
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Abstract

Lithium ion batteries with high-rate performance have been demanded since electric and hybrid vehicles are released. It is known that high interfacial resistance between electrode and electrolyte prevents intercalation of lithium ions. We investigated high-rate capability of typical LiCoO2 cathode with various surface morphologies using epitaxial thin films prepared by pulsed laser deposition. As a result, high-rate performance in (104)LiCoO2 thin films was enhanced by an increase of (110)LiCoO2 facet density because diffusion coefficient of (110)LiCoO2 was larger than that of (104)LiCoO2. Therefore, a control of crystal plane at the surface is a key point for high-rate performance.

Type
Articles
Copyright
Copyright © Materials Research Society 2018 

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