在区块共聚合物电解质的导电性测量中的界面效应
Jonathan P Coote1, Samuel K J Adotey1, Joshua R Sangoro2
1Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States.
区块共聚合物的离子导电性是异构的. 聚乙烯-块-聚合物离子液体 (PS-block-PIL) 材料中增强的平面导电性是由于表面浸湿层,而不是通过平面压缩.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 聚合物科学 聚合物科学
背景情况:
- 状块共聚合物电解质表现出异型离子导电性,在平面内值明显高于通过平面.
- 之前的研究表明,由于在聚乙烯-块-聚合物离子液体 (PS-块-PIL) 系统中的接口域分层,导致通过平面导电性减弱.
- 了解这种异构性对于开发高效的聚合物离子液体电解质至关重要.
研究的目的:
- 为了调查PS-block-PIL材料中的离子导电性异构的起源.
- 为了确定异构性是否来自通过平面的低压或在平面上的增强.
- 确定负责增强平面内离子导电性的结构因素.
主要方法:
- 阻抗光谱法被用来测量通过平面的离子导电性在基于模型PIL的系统与控制的界面配置文件.
- 用各种PS-block-PIL材料的顶接触电极配置,P(S-r-IL) 共聚合物和PIL同聚合物获得阻抗光谱.
- 分析的重点是将离子导电性与界面组成,结构和表面湿层的形成相关联.
主要成果:
- 通过平面导电性测量对界面组成或结构的变化不敏感,反驳了通过平面压缩假设.
- 观察到增强的平面内离子导电性,与自由表面形成富含聚合物离子液 (PIL) 的湿层相关.
- 增强的在平面导电性与几何预测保持一致,而通过平面导电性仍然明显较低.
结论:
- 在PS-块-PIL离子导电性中的异质性源于在平面内增强,而不是通过平面的低压.
- 表面诱导的富含PIL的湿层为离子提供了低阻力通路,增强了平面导电性.
- 准确的结构导电关系需要考虑阻抗测量的表面和散装贡献.
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