Nuclear magnetic resonance study of PEO-based composite polymer electrolytes

被引：50
作者：
Bloise, AC
Tambelli, CC
Franco, RWA
Donoso, JP
Magon, CJ
Souza, MF
Rosario, AV
Pereira, EC
机构：
[1] Univ Sao Paulo, Inst Fis, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, Dept Quim, LIEC, BR-13560970 Sao Carlos, SP, Brazil
来源：
ELECTROCHIMICA ACTA | 2001年 / 46卷 / 10-11期
基金：
巴西圣保罗研究基金会;
关键词：
polymer electrolytes; NMR; composite; PEO; carbon black;
D O I：
10.1016/S0013-4686(00)00755-6
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The effect of carbon black and ceramic (alpha -Al2O3 and gamma -Al2O3) particles on the cationic and polymer chain mobility have been investigated in poly(ethylene oxide)-lithium salt (LiClO4 and LiBF4) solid composite polymer electrolytes by using nuclear magnetic resonance (NMR) techniques. Proton (H-1) and lithium (Li-7) lineshapes and spin-lattice relaxation times were measured as a function of temperature. The Li-7 data indicates that the lineshape and relaxation is affected by the coupling of its quadrupolar moment to the surrounding electric field gradients. Activation energies xtracted from the Li-7 relaxation data are in the range 0.20-0.25 eV. Results show that the addition of alpha -Al2O3 influenced both, the relative cation mobility and the polymer chain motion. Calculation shows that this result is in quantitative agreement with the conductivity data. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1571 / 1579
页数：9
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