Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Synthesis and characterization of LiCoO2 thin film by sol-gel process

Sol-gel법에 의한 LiCoO2 박막의 합성과 특성평가

  • Roh, Tae-Ho (Department of Gem and Precious Metal, Dongshin University) ;
  • Yon, Seog-Joo (Department of Gem and Precious Metal, Dongshin University) ;
  • Ko, Tae-Seog (Department of Gem and Precious Metal, Dongshin University)
  • 노태호 (동신대학교 보석귀금속학과) ;
  • 연석주 (동신대학교 보석귀금속학과) ;
  • 고태석 (동신대학교 보석귀금속학과)
  • Received : 2014.04.28
  • Accepted : 2014.05.30
  • Published : 2014.06.30
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Abstract

$LiCoO_2$ thin film has received diverse attention as cathodes material of thin-film micro-batteries. In this study, $LiCoO_2$ thin films were synthesized on Au substrates by sol-gel spin coating method and an annealing process. Their structures were studied using X-ray diffraction and Raman Spectroscopy. The particle morphologies of these thin films were observed by Scaning electron microscope. From the results of X-ray diffractometry and Raman Spectroscopy analyses, it was found that as-grown films had the structure of spinel (LT-$LiCoO_2$) and layered-Rock-salt (HT-$LiCoO_2$) at $550^{\circ}C$ and $750^{\circ}C$ respectively. The annealed films at $650^{\circ}C$ were presumed to be the mixed state of these two types. Throlugh the scanning electron microscope, It was estimated that the particle size in as-grown films at $750^{\circ}C$, were larger crystilline particle than in those at the other lower temperature and well distributed in the film.

$LiCoO_2$는 박막 베터리의 양극재료로써 많은 관심을 받고 있다. 본 연구에서는 스핀 코터를 이용한 졸-겔 합성공정과 열처리 과정에 의해서 Au 지지체 위에 $LiCoO_2$ 박막을 합성하였다. 합성된 박막의 구조는 X-선회절분석, 라만분광 광도계를 이용하여 분석하였다. 박막의 입자 형태는 전자현미경에 의해 관찰하였다. X-선회절분석, 라만분광광도계의 결과로부터, $550^{\circ}C$와 $750^{\circ}C$에서 합성된 박막은 스피넬구조와 층상 암염 형 구조를 가지는 박막으로 보이며, $650^{\circ}C$에서 합성된 박막은 층상 암염 형 구조와 스피넬 구조가 혼재되어져 있는 것으로 생각된다. $750^{\circ}C$에서 합성된 박막은 다른 낮은 온도에서 합성된 박막보다 큰 결정질의 균일한 분포의 입자를 가지는 것으로 확인되었다.

Keywords

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