Abstract Recently, research on solid polymer electrolytes (SPEs) for lithium-ion batteries (LIBs) has been actively carried out as an alternative to conventional liquid electrolytes that present safety issues such as flammability and explosion. However, the SPEs show relatively low ion conductivity, compared to the liquid electrolytes. In this study, a poly(vinylidene difluoride) (PVDF)-based SPE was prepared by introducing two different electrolytes; one is weak-binding lithium bis(trifluoromethane)sulfonimide (LiTFSI) salt mixture with solvating plastic crystal succinonitrile (SN) and the other is lithium bis(fluorosulfonyl)imide (LiFSI) salts. Among the SPEs studied, the PVDF/LiFSI-containing SPE membrane exhibited the highest room temperature ion conductivity of 1 x 10−3 S/cm, characterized by electrochemical impedance spectroscopy (EIS).

中文翻译：

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锂盐类型对聚偏二氟乙烯基固体聚合物电解质离子电导率的影响

摘要 近年来，作为传统液体电解质的替代品，锂离子电池（LIBs）固体聚合物电解质（SPEs）的研究得到了积极开展，传统液体电解质存在可燃性和爆炸性等安全问题。然而，与液体电解质相比，SPE 的离子电导率相对较低。在本研究中，通过引入两种不同的电解质制备了基于聚偏二氟乙烯 (PVDF) 的 SPE；一种是弱结合的双（三氟甲烷）磺酰亚胺锂（LiTFSI）盐与溶剂化塑料晶体琥珀腈（SN）的混合物，另一种是双（氟磺酰基）酰亚胺锂（LiFSI）盐。在研究的 SPE 中，含有 PVDF/LiFSI 的 SPE 膜表现出最高的室温离子电导率，为 1 x 10-3 S/cm，由电化学阻抗谱 (EIS) 表征。