Rizzuto Carmen, Teeters Dale C, Barberi Riccardo C, Castriota Marco
Department of Physics, University of Calabria Ponte Bucci, Cubo 33B, 87036 Rende, Italy.
CNR-Nanotec c/o Department of Physics, University of Calabria Ponte Bucci, 87036 Rende, Italy.
Gels. 2022 Jun 8;8(6):363. doi: 10.3390/gels8060363.
This work describes the electrochemical properties of a type of PMMA-based gel polymer electrolytes (GPEs). The gel polymer electrolyte systems at a concentration of (20:80) % / were prepared from poly (methyl methacrylate), lithium perchlorate LiClO and single plasticizer propylene carbonate (PMMA-Li-PC) and a mixture of plasticizers made by propylene carbonate and ethylene carbonate in molar ratio 1:1, (PMMA-Li-PC-EC). Different salt concentrations (0.1 M, 0.5 M, 1 M, 2 M) were studied. The effect of different plasticizers (single and mixed) on the properties of gel polymer electrolytes were considered. The variation of conductivity versus salt concentration, thermal properties using DSC and TGA, anodic stability and FTIR spectroscopy were used in this study. The maximum ionic conductivity of σ = 0.031 S/cm were obtained for PMMA-Li-PC-EC with a salt concentration equal to 1 M. Ion-pairing phenomena and all ion associations were observed between lithium cations, plasticizers and host polymers through FTIR spectroscopy. The anodic stability of the PMMA-based gel polymer electrolytes was recorded up to 4 V. The glass temperatures of these electrolytes were estimated. We found they were dependent on the plasticization effect of plasticizers on the polymer chains and the increase of the salt concentration. Unexpectedly, it was determined that an unreacted PMMA monomer was present in the system, which appears to enhance ion conduction. The presence and possibly the addition of a monomer may be a technique for increasing ion conduction in other gel systems that warrants further study.
这项工作描述了一种基于聚甲基丙烯酸甲酯的凝胶聚合物电解质（GPEs）的电化学性质。浓度为（20:80）%的凝胶聚合物电解质体系由聚甲基丙烯酸甲酯、高氯酸锂LiClO₄和单一增塑剂碳酸丙烯酯（PMMA-Li-PC）以及由碳酸丙烯酯和碳酸乙烯酯按摩尔比1:1制成的增塑剂混合物（PMMA-Li-PC-EC）制备而成。研究了不同的盐浓度（0.1 M、0.5 M、1 M、2 M）。考虑了不同增塑剂（单一和混合）对凝胶聚合物电解质性能的影响。本研究使用了电导率随盐浓度的变化、差示扫描量热法（DSC）和热重分析法（TGA）测定的热性能、阳极稳定性以及傅里叶变换红外光谱法（FTIR）。对于盐浓度等于1 M的PMMA-Li-PC-EC，获得了最大离子电导率σ = 0.031 S/cm。通过傅里叶变换红外光谱法观察到锂阳离子、增塑剂和主体聚合物之间存在离子对现象和所有离子缔合。记录了基于聚甲基丙烯酸甲酯的凝胶聚合物电解质的阳极稳定性高达4 V。估计了这些电解质的玻璃化温度。我们发现它们取决于增塑剂对聚合物链的增塑作用以及盐浓度的增加。出乎意料的是，确定体系中存在未反应的聚甲基丙烯酸甲酯单体，这似乎增强了离子传导。单体的存在以及可能的添加可能是一种在其他凝胶体系中增加离子传导的技术，值得进一步研究。
