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Ionic Conduction Properties in Li$_2$O-0.8P$_2$O$_5$-0.2B$_2$O$_3$ Glass: Electrical Conductivity and Impedance Analysis
New Physics: Sae Mulli 2017; 67: 1257~1263
Published online November 30, 2017;
© 2017 New Physics: Sae Mulli.

Mac KIM, Yong Suk YANG*

Department of Nano Fusion Technology, Nanoenergy Engineering, Pusan National University, Busan 46241, Korea
Correspondence to:
Received August 16, 2017; Revised October 10, 2017; Accepted October 16, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We investigated the ionic conduction properties of Li$_2$O-0.8P$_2$O$_5$-0.2B$_2$O$_3$ (LPBO) glass, which is used as a thin-film Li-ion battery electrolyte. The glass sample was synthesized by using the melt quenching method. We used Raman spectroscopy to analyze the network microstructure mode of the LPBO glass. The ionic conductivity of the LPBO glass could be explained by employing the electrical conductivity and the complex impedance representation. The electrical measurements were carried out in the frequency and temperature ranges of 100 Hz~30 MHz and 30~600 $^\circ$C at a heating rate of 2 $^\circ$C/min, respectively. The $dc$ and the $ac$ activation energies obtained from Jonscher's universal power law were 0.51 and 0.45 eV, and those were 0.50 and 0.48 eV from the Cole-Cole plot. The $dc$ conductivity of the LPBO glass was ~10$^{-7}$ S/cm at room temperature. The similarity of the values of the $ac$ and the $dc$ activation energies indicate that the heights of the energy barriers for ion conduction are not markedly different from each other.   
PACS numbers: 72.80.Ng, 77.22.Gm, 72.20.Ee
Keywords: Li$_2$O-0.8P$_2$O$_5$-0.2B$_2$O$_3$ glass, Ionic conductivity, Activation energy, Power law, Cole-Cole plot

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