Investigations of microstructure and ionic conductivity for (PEO) 8 -ZnO-LiClO4 polymer nanocomposite electrolytes

被引：2
|
作者：
Wang Jun-Jun [1 ]
Gong Jing [1 ]
Gong Zhen-Li [1 ]
Yan Xiao-Li [1 ]
Gao Shu [1 ]
Wang Bo [1 ]
机构：
[1] Wuhan Univ, Sch Phys, Wuhan 430072, Peoples R China
来源：
ACTA PHYSICA SINICA | 2011年 / 60卷 / 12期
基金：
中国国家自然科学基金;
关键词：
positron annihilation lifetime spectroscopy; nanocomposite polymer electrolytes; ionic conductivity; free volume; FREE-VOLUME; POSITRON-ANNIHILATION; TEMPERATURE; FILLERS; ZNO;
D O I：
10.7498/aps.60.127803
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effects of nanosized ZnO on the microstructure, the free volume and the ionic conductivity of poly ethylene oxide (PEO) nanocomposite electrolytes (PEO)(8)-ZnO-LiClO4 are systematically studied by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy and positron annihilation lifetime spectroscopy (PALS), respectively. The experimental results show that the presence of the nanosized ZnO brings about a reduction in the crystallinity of the PEO phase and a very marked increase in ionic conductivity. PALS discrete analysis shows that the free volume size, the free volume concentration and the relative free volume fraction significantly increase with the increase of nano-ZnO. Specially, it is the first time to observe the occurrence of peaks of the free volume distribution split after nano-ZnO has been filled, which indicates that the ZnO added into (PEO)(8)-LiClO4 has an important effect on the microstructure for nanocomposites due to the interaction between the nano-ZnO and matrix. A direct correlation between the free volume fraction and the ionic conductivity is observed, and the ionic conductivity mechanism is discussed.
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页数：8
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