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Interfacial Layering and Screening Behavior of Glyme-Based Lithium Electrolytes
The Journal of Physical Chemistry Letters ( IF 5.7 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.jpclett.7b03307
Maryam Nojabaee 1 , Hsiu-Wei Cheng 2 , Markus Valtiner 2 , Jelena Popovic 1 , Joachim Maier 1
Affiliation  

Understanding of electrical double layers is essential to all electrochemical devices, particularly at high charge carrier concentrations. Using a combined approach (surface force apparatus, zeta potential, infrared spectroscopy), we propose a model for the interfacial structure of triglyme electrolytes on muscovite mica. In contact with the pure triglyme, a brush-like polymeric structure grows on the mica surface. When lithium triflate is present in the triglyme, this structure is suppressed by anion adsorption and an extended double layer is formed. A surprising result of great fundamental significance is that the effective screening length measured by surface force apparatus at considerable lithium triflate concentrations (above 0.2 M) is substantially higher than expected from the Debye–Hückel theory. This suggests a high degree of complex salt association as a novel characteristic feature of salt-containing electrolytes.

中文翻译:

甘醇基锂电解质的界面分层和筛选行为

对双电层的理解对于所有电化学装置都是必不可少的,尤其是在高载流子浓度下。使用组合方法(表面力仪器,ζ电位,红外光谱法),我们提出了一种在白云母云母上三甘醇二甲酸酯电解质的界面结构模型。与纯三甘醇二甲醚接触时,在云母表面上会出现刷状的聚合物结构。当三氟甲磺酸酯中存在三氟甲磺酸锂时,该结构被阴离子吸附抑制,并形成延伸的双层。具有重大根本意义的令人惊讶的结果是,在相当可观的三氟甲磺酸锂浓度(高于0.2 M)下,通过表面力设备测得的有效筛选长度大大高于Debye–Hückel理论的预期。
更新日期:2018-01-19
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