NMR and conductivity study of PEO-based composite polymer electrolytes

被引：27
作者：
Bloise, AC
Donoso, JP
Magon, CJ
Rosario, AV
Pereira, EC
机构：
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, Dept Quim, LIEC, BR-13560970 Sao Carlos, SP, Brazil
来源：
ELECTROCHIMICA ACTA | 2003年 / 48卷 / 14-16期
关键词：
polymer electrolyte; NMR; composite; PEO; ionic conductivity; TiO2;
D O I：
10.1016/S0013-4686(03)00210-X
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The influence of the space charge created by the presence of TiO2 nanoparticles on the lithium and polymer chain mobility have been investigated in solid composite polymer electrolytes (CPE), poly(ethylene oxide) (PEO) LiClO4, by using complex impedance spectroscopy and nuclear magnetic resonance (NMR). Special care was taken with the synthesis and the characterization of the TiO2 particles and with the composite preparation. The conductivity and NMR measurements were undertaken in composite samples nanoparticles having constant total surface area. Proton (H-1) and lithium (Li-7) lineshapes and spin-lattice relaxation times were measured as a function of temperature. Activation energies extracted from the Li-7 relaxation data are in the range 0.20-0.22 eV. The NMR decoupling experiment suggests that the Li-Li interactions are stronger in the composites when compared with those of the ceramic free electrolytes. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2239 / 2246
页数：8
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