Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Li-free Thin-Film Batteries with Structural Configuration of Pt/LiCoO2/LiPON/Cu and Pt/LiCoO2/LiPON/LiCoO2/Cu

Pt/LiCoO2/LiPON/Cu와 Pt/LiCoO2/LiPON/LiCoO2/Cu 구조를 갖는 Li-free 박막전지

  • Shin, Min-Seon (Department of Nano Applied Engineering, Kangwon National University) ;
  • Kim, Tae-Yeon (Department of Nano Applied Engineering, Kangwon National University) ;
  • Lee, Sung-Man (Department of Nano Applied Engineering, Kangwon National University)
  • 신민선 (강원대학교 나노응용공학과) ;
  • 김태연 (강원대학교 나노응용공학과) ;
  • 이성만 (강원대학교 나노응용공학과)
  • Received : 2018.08.22
  • Accepted : 2018.08.31
  • Published : 2018.08.31
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Abstract

All solid state thin film batteries with two types of cell structure, Pt / $LiCoO_2$ / LiPON / Cu and Pt / $LiCoO_2$ / LiPON / $LiCoO_2$ / Cu, are prepared and their electrochemical performances are investigated to evaluate the effect of $LiCoO_2$ interlayer at the interface of LiPON / Cu. The crystallinity of the deposited $LiCoO_2$ thin films is confirmed by XRD and Raman analysis. The crystalline $LiCoO_2$ cathode thin film is obtained and $LiCoO_2$ as the interlayer appears to be amorphous. The surface morphology of Cu current collector after cycling of the batteries is observed by AFM. The presence of a 10 nm-thick layer of $LiCoO_2$ at the interface of LiPON / Cu enhances the interfacial adhesion and reduces the interfacial resistance. As a result, Li plating / stripping at the interface of LiPON / Cu during charge/discharge reaction takes place more uniformly on Cu current collector, while without the interlayer of $LiCoO_2$ at the interface of LiPON / Cu, the Li plating / stripping is localized on current collector. The thin film batteries with the interlayer of $LiCoO_2$ at the interface of LiPON / Cu exhibits enhanced initial coulombic efficiency, reversible capacity and cycling stability. The thickness of the anode current collector Cu also appears to be crucial for electrochemical performances of all solid state thin film batteries.

Keywords

References

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