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Journal of the Korean Ceramic Society 2001;38(1): 100. |
| Pt Doping Mechanism of Vanadium Oxide Cathode Film Grown on ITO Glass for Thin Film Battery |
| Han-Ki Kim, Tae-Yeon Seong1, Eun-Jeong Jeon, Won-Il Cho, Young-Soo Yoon |
Thin Film Technology Research Center & Battery and Fuel Cell Research Center Korea Institute of Science and Technology(KIST)
1Department of Materials Science and Engineering, and Center for Electronic Materials Research, Kwangju Institute of Science and Technology (K-JIST) |
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| ABSTRACT |
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An all solid-state thin film battery (TFB) was fabricated by growing, undoped and Pt-doped vanadium oxide cathode film ( $V_2$ $O_{5}$ ) on I $n_2$ $O_3$: Sn coated glass, respectively. Room temperature charge-discharge measurements based on Li/Lipon/ $V_2$ $O_{5}$ full-cell structure with a constant current clearly shows that the Pt-doped $V_2$ $O_{5}$ cathode film is superior, in terms of cyclibility. X-ray diffraction (XRD) results indicate that the Pt doping process induces a more random amorphous structure than an undoped $V_2$ $O_{5}$ film. In addition to its modified structure, the Pt-doped $V_2$ $O_{5}$ film has a smoother surface than the undoped sample. Compared to an undoped $V_2$ $O_{5}$ film, the Pt doped $V_2$ $O_{5}$ cathode film has a higher electron conductivity. We hypothesize that the addition of Pt alters electrochemical performance in a manner of making more random amorphous structure and gives an excess electron by replacing the $V^{+5}$. Possible mechanisms are discussed for the observed Pt doping effect on structural and electrochemical properties of vanadium oxide cathode films, which are grown on I $n_2$ $O_3$: Sn coated glass. |
| Key words:
Thin film battery, $V_2$$O_5$, Amorphous, Pt-doping, Conductivity |
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