Optimization of the Properties of Photocured Hydrogels for Use in Electrochemical Capacitors

光致聚合物 材料科学 介电谱 化学工程 单体 电解质 自愈水凝胶 聚合 差示扫描量热法 循环伏安法 电化学 聚合物 高分子化学 复合材料 电极 化学 物理化学 物理 工程类 热力学
作者
Piotr Gajewski,Aneta Lewandowska,Katarzyna Szczęśniak,Grzegorz Przesławski,Agnieszka Marcinkowska
出处
期刊:Polymers [Multidisciplinary Digital Publishing Institute]
卷期号:13 (20): 3495-3495 被引量:4
标识
DOI:10.3390/polym13203495
摘要

In this work, hydrogel polymer electrolytes (HPEs) were obtained by the photopolymerization of a mixture of two monomers: Exothane 8 (Ex8) and 2-hydroxyethylmethacrylate acid phosphate (HEMA-P) in an organic solvent N-methyl-2-pyrrolidone (NMP), which was replaced after polymerization with water, and then with the electrolyte. The ratio of monomers as well as the concentration of NMP was changed in the composition to study its influence on the properties of the HPE: conductivity (electrochemical impedance spectroscopy, EIS) and mechanical properties (puncture resistance). Properties were optimized using a mathematical model to obtain a hydrogel with both good mechanical and conductive properties. To the best of our knowledge, it is the first publication that demonstrates the application of optimization methods for the preparation of HPE. Then, the hydrogel with optimal properties was tested as a separator in a two-electrode symmetric AC/AC pouch-cell. The cells were investigated by cyclic voltammetry galvanostatic charge/discharge with potential limitation and EIS. Good mechanical properties of HPE allowed for obtaining samples of smaller thickness while maintaining very good dimensional stability. Thus, the electrochemical capacitor (EC) resistance was reduced and their electrochemical properties improved. Moreover, photopolymerization kinetics in the solvent and in bulk by photo-DSC (differential scanning calorimetry) were performed. The great impact on the polymerization of HEMA-P and its mixtures (with Ex8 and NMP) have strong intermolecular interactions between reagents molecules (i.e., hydrogen bonds).
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