A mechanically robust gel polymer electrolyte (GPE) with cross-linked networks is crucial for energy storage and conversion applications. Poly[1-cyanomethyl-3-vinylimidazolium bis(trifluoromethane)sulfonimide] (PCMVImTFSI) was treated via various bases at room temperature, leading to GPE membranes with high mechanical strength. The structures of the GPE membranes were characterized by Fourier-transform infrared spectroscopy, solid-state NMR and atomic force microscopy. The “cation–methylene–nitrile” group sequence embedded in the repeating units of PCMVImTFSI enables in situ cross-linking of nitriles under basic conditions such as with mild NH₃ vapor, significantly improving the membrane formation ability of PCMVImTFSI. The maximum fracture strength of the NH₃-treated membrane is 6.2 MPa, 8 times higher than those of membranes that were thermally cured at 200 °C for an equivalent time of 6 h. The crosslinking chemistry is viable with various cations and counter anions of PILs, thus representing a facile and effective method to prepare high-strength GPE membranes.

中文翻译：

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在室温下通过碱处理轻松制造坚固的凝胶聚（离子液体）电解质

具有交联网络的机械坚固的凝胶聚合物电解质 (GPE) 对于能量存储和转换应用至关重要。聚[1-氰基甲基-3-乙烯基咪唑鎓双（三氟甲烷）磺酰亚胺]（PCMVImTFSI）在室温下通过各种碱处理，得到具有高机械强度的 GPE 膜。GPE 膜的结构通过傅里叶变换红外光谱、固态核磁共振和原子力显微镜进行表征。嵌入在 PCMVImTFSI 重复单元中的“阳离子-亚甲基-腈”基团序列使腈在碱性条件下（如温和的 NH ₃蒸气）能够原位交联，显着提高了 PCMVImTFSI 的成膜能力。NH的最大断裂强度₃处理过的膜为 6.2 MPa，是在 200 °C 下热固化 6 小时等效时间的膜的 8 倍。交联化学与 PIL 的各种阳离子和反阴离子是可行的，因此是制备高强度 GPE 膜的简便有效的方法。