CONDUCTIVITY AND DIELECTRIC-CONSTANT OF PPO AND PPO-BASED SOLID ELECTROLYTES FROM DC TO 6 GHZ

被引:37
作者
TIPTON, AL
LONERGAN, MC
RATNER, MA
SHRIVER, DF
WONG, TTY
HAN, K
机构
[1] NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208
[2] NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208
关键词
D O I
10.1021/j100066a039
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The conductivity and dielectric response of poly(propylene oxide) (PPO) and the polymeric solid electrolytes (PPO)(8)NH4CF3SO3, (PPO)(16)NaI, (PPO)(10)NaI, and (PPO)(8)NaI were studied in the frequency range from dc to 6 GHz and the temperature range from 173 to 323 K with the objective of elucidating the dynamic factors that affect ion transport in polyether electrolytes. The temperature dependencies of the primary alpha-relaxation of PPO and the dc electrical conductivity of the salt complexes are consistent with this relaxation playing a key role in ionic conduction in polymer electrolytes. For the salt complexes, the alpha-relaxation appears to be shifted to lower frequencies relative to pure PPO, and this is attributed to virtual cross-linking. High-frequency room temperature measurements permit for direct comparison of the dielectric properties of (PPO)(8)NH4CF3SO3 with a supercooled amorphous (PEO)(8)NH4CF3SO3 complex. A dissimilarity between optical dielectric constants and those measured at approximately 3 GHz for the salt complexes suggests the presence of a high-frequency ionic relaxation as predicted by the dynamic bond percolation model. The relative influence of segmental mobility and ion-ion interactions on the dc conductivity of polymer salt complexes is discussed.
引用
收藏
页码:4148 / 4154
页数:7
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