Instituto de Ciencia y Tecnología de Polímeros Consejo Superior de Investigaciones Científicas (ICTP-CSIC), Calle Juan de la Cierva 3, 28006, Madrid, Spain.
Department of Energy Conversion and Storage, Technical University of Denmark, Anker Engelunds vej, Building 301, 2800, Kongens Lyngby, Denmark.
ChemSusChem. 2023 Jun 22;16(12):e202300256. doi: 10.1002/cssc.202300256. Epub 2023 May 17.
Gel polymer electrolytes composed of deep eutectic solvent acetamide :Zn(TFSI) and poly(ethylene oxide) (PEO) are prepared by using a fast, solvent-free procedure. The effect of the PEO molecular weight and its concentration on the physicochemical and electrochemical properties of the electrolytes are studied. Gels prepared with ultrahigh molecular-weight PEO present pseudo-solid behavior and ionic conductivity even higher than that of the original liquid electrolyte. A decrease in the dendritic growth in soft gels with PEO contents up to 1 wt % is demonstrated. The changes in the chemical structure of the electrolyte produced by the strong interactions between ethylene oxide units and Zn have also been studied. The addition of PEO takes the electrolyte out of its original eutectic composition, producing blend crystallization. However, it is possible to retain the eutectic point of the electrolyte in a gel form if the addition of PEO is accompanied by the reduction of acetamide.
Zn(TFSI)和聚（氧化乙烯）（PEO）组成的凝胶聚合物电解质通过快速、无溶剂的方法制备。研究了 PEO 分子量及其浓度对电解质的物理化学和电化学性能的影响。用超高分子量 PEO 制备的凝胶表现出类固态行为，离子电导率甚至高于原始液体电解质。证明了在 PEO 含量高达 1wt%的软凝胶中，枝晶生长减少。通过氧化乙烯单元和 Zn 之间的强相互作用，研究了电解质化学结构的变化。PEO 的添加使电解质脱离其原始共晶组成，产生共混结晶。然而，如果在添加 PEO 的同时减少乙酰胺的用量，则有可能使凝胶形式的电解质保持共晶点。
