Solid polymer electrolytes consisting of CO 2 -derived poly(ethylene carbonate) (PEC), LiPF 6 , and plasticizers (glycerol or 1-ethyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide, EMImTFSI) were prepared by a simple casting method, and their dielectric relaxation behavior was evaluated using broadband electric spectroscopy (BES), which clarified the correlation between the polymer motion and ionic conduction. From the DSC and BES results, it was revealed that the addition of plasticizer decreased the glass transition temperature and increased the dc conductivity ( σ dc ) of the PEC electrolyte. The BES results also revealed that the plasticizer increased the segmental motion of PEC and improved σ dc , and the plasticizing effect of EMImTFSI on the PEC electrolyte was larger than that of glycerol. From the results of the Walden plot and fragility analysis, it was expected that the degree of decoupling ε and fragility m would increase with the addition of plasticizer because these plasticizers weaken the interactions between the PEC chains and Li ions in the electrolyte. Plasticized poly(ethylene carbonate) (PEC)/LiPF 6 electrolytes were prepared and evaluated their ion-conductive and dielectric relaxation behavior using broadband electric spectroscopy (BES). The BES results indicated that the plasticizer accelerates segmental motion of PEC and improve the dc conductivity, and the plasticizing effect of ionic liquid (EMImTFSI) on the PEC electrolyte is larger than that of glycerol. From the results of the Walden plot and fragility analysis, it was revealed that the degree of decoupling and the value of fragility increase by the addition of plasticizer, and these plasticizers weaken interactions between PEC chains and Li ions in the electrolyte.

中文翻译：

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增塑剂对聚碳酸亚乙酯基锂电解质离子导电和介电行为的影响

通过简单的浇铸方法制备了由 CO 2 衍生的聚（碳酸亚乙酯）（PEC）、LiPF 6 和增塑剂（甘油或 1-乙基-3-甲基咪唑鎓双（三氟甲磺酰基）亚胺，EMImTFSI）组成的固体聚合物电解质，并且使用宽带电光谱（BES）评估了它们的介电弛豫行为，这阐明了聚合物运动与离子传导之间的相关性。从 DSC 和 BES 结果表明，增塑剂的添加降低了 PEC 电解质的玻璃化转变温度并增加了直流电导率 (σdc)。BES 结果还表明，增塑剂增加了 PEC 的分段运动并提高了 σ dc ，并且 EMImTFSI 对 PEC 电解质的增塑作用大于甘油。从瓦尔登图和脆性分析的结果可以看出，随着增塑剂的加入，解耦 ε 和脆性 m 的程度会增加，因为这些增塑剂削弱了电解质中 PEC 链和锂离子之间的相互作用。制备了增塑聚（碳酸亚乙酯）（PEC）/LiPF 6 电解质，并使用宽带电光谱（BES）评估了它们的离子导电和介电弛豫行为。BES结果表明增塑剂加速了PEC的分段运动，提高了直流电导率，离子液体（EMImTFSI）对PEC电解液的增塑作用大于甘油。从瓦尔登图和脆性分析的结果来看，