A promising method of synthesizing a lithium-containing room temperature polymeric ionic liquid (PIL) by utilizing the zwitterionic effect to turn a lithium salt into a liquid for single lithium-ion conduction was proposed. In this work, the room temperature PIL was constructed by the equimolar monomer mixture of zwitterion 3-(1-vinyl-3-imidazolic)propanesulfonate (VIPS) and 4-styrenesulfnny(trifluoromethylsulfony)imde (LiSTFSI) based on intermolecular electrostatic interactions. In situ photopolymerization with flexible chain poly(ethylene glycol)methyl ether methacrylate (PEGM) and cross-linker poly(ethylene glycol)dimethacrylate (PEGDM) in the presence of propylene carbonate (PC) generated free-standing PIL electrolyte films. The PIL electrolytes with Li⁺-rich channels have an excellent lithium transference number approaching unity (0.93 at room temperature) while attaining comparable ionic conductivity (σ ≈ 1.31 × 10⁻⁴ S cm⁻¹ at 30 °C). The charge–discharge performance of a Li/LiFePO₄ half-cell equipped with this PIL electrolyte would provide a promising model system for novel single lithium ion conductors.

中文翻译：

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锂离子电池基于聚（离子液体）的单一锂离子聚合物电解质†

提出了一种利用两性离子效应将锂盐转变成液体进行单锂离子传导的含锂室温聚合离子液体（PIL）的合成方法。在这项工作中，基于分子间静电相互作用，由两性离子3-（1-乙烯基-3-咪唑基）丙烷磺酸盐（VIPS）和4-苯乙烯磺酰（三氟甲基磺酸）酰亚胺（LiSTFSI）的等摩尔单体混合物构建室温PIL。在碳酸亚丙酯（PC）的存在下，使用柔性链聚（乙二醇）甲基醚甲基丙烯酸甲酯（PEGM）和交联剂聚（乙二醇）二甲基丙烯酸酯（PEGDM）进行原位光聚合，生成了独立的PIL电解质膜。含Li ⁺的PIL电解质富信道具有（在室温下0.93）的优异的锂迁移数接近统一同时获得相当的离子电导率（σ听，说：1.31×10 ^-4小号厘米^-1，在30℃）。装有这种PIL电解质的Li / LiFePO ₄半电池的充放电性能将为新型单锂离子导体提供有希望的模型系统。