Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO4 polymeric electrolyte by positron annihilating lifetime spectroscopy

doi:10.1088/1674-1056/21/10/107803

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 107803-107803.doi: 10.1088/1674-1056/21/10/107803

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy

龚静, 宫振丽, 闫晓丽, 高舒, 张忠良, 王波

School of Physics and Key Laboratory of Nuclear Solid State Physics, Wuhan University, Wuhan 430072, China

收稿日期:2012-03-04 修回日期:2012-04-10 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11175134).

Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy

Gong Jing (龚静), Gong Zhen-Li (宫振丽), Yan Xiao-Li (闫晓丽), Gao Shu (高舒), Zhang Zhong-Liang (张忠良), Wang Bo (王波)

School of Physics and Key Laboratory of Nuclear Solid State Physics, Wuhan University, Wuhan 430072, China

Received:2012-03-04 Revised:2012-04-10 Online:2012-09-01 Published:2012-09-01
Contact: Wang Bo E-mail:wuzhs@mail.xidian.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11175134).

摘要/Abstract

摘要： The positron annihilation lifetime and ionic conductivity are each measured as a function of organophilic rectorite (OREC) content and temperature in a range from 160 K to 300 K. According to the variation of ortho-positronium (o-Ps) lifetime with temperature, the glassy transition temperature is determined. The continuous maximum entropy lifetime (MELT) analysis clearly shows that the OREC and temperature have important effects on o-Ps lifetime and free volume distribution. The experimental results show that the temperature dependence of ionic conductivity obeys the Vogel-Tammann-Fulcher (VTF) and Williams-Landel-Ferry (WLF) equations, implying a free-volume transport mechanism. A linear least-squares procedure is used to evaluate the apparent activation energy related to the ionic transport in the VTF equation and several important parameters in the WLF equation. It is worthwhile to notice that a direct linear relationship between the ionic conductivity and free volume fraction is established using the WLF equation based on the free volume theory for nanocomposite electrolyte, which indicates that the segmental chain migration and ionic migration and diffusion could be explained by the free volume theory.

关键词: positron, free volume, polymeric electrolyte, ionic conduction

Abstract: The positron annihilation lifetime and ionic conductivity are each measured as a function of organophilic rectorite (OREC) content and temperature in a range from 160 K to 300 K. According to the variation of ortho-positronium (o-Ps) lifetime with temperature, the glassy transition temperature is determined. The continuous maximum entropy lifetime (MELT) analysis clearly shows that the OREC and temperature have important effects on o-Ps lifetime and free volume distribution. The experimental results show that the temperature dependence of ionic conductivity obeys the Vogel-Tammann-Fulcher (VTF) and Williams-Landel-Ferry (WLF) equations, implying a free-volume transport mechanism. A linear least-squares procedure is used to evaluate the apparent activation energy related to the ionic transport in the VTF equation and several important parameters in the WLF equation. It is worthwhile to notice that a direct linear relationship between the ionic conductivity and free volume fraction is established using the WLF equation based on the free volume theory for nanocomposite electrolyte, which indicates that the segmental chain migration and ionic migration and diffusion could be explained by the free volume theory.

Key words: positron, free volume, polymeric electrolyte, ionic conduction

中图分类号: (Positron annihilation)

78.70.Bj

72.80.Tm (Composite materials) 82.45.Gj (Electrolytes)

龚静, 宫振丽, 闫晓丽, 高舒, 张忠良, 王波. Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy[J]. 中国物理B, 2012, 21(10): 107803-107803.

Gong Jing (龚静), Gong Zhen-Li (宫振丽), Yan Xiao-Li (闫晓丽), Gao Shu (高舒), Zhang Zhong-Liang (张忠良), Wang Bo (王波). Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy[J]. Chin. Phys. B, 2012, 21(10): 107803-107803.

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Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy

Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO₄ polymeric electrolyte by positron annihilating lifetime spectroscopy

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