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在凝聚合物电解质中优化离子溶解以稳定金属阳极

Kangsheng Huang¹, Sheng Bi², Hai Xu¹

¹Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.

|June 17, 2023

概括

本研究介绍了一种用于金属电池 (LMB) 的新型凝聚合物电解质 (GPE),使用稀释剂来增强稳定性和离子传输. 改进的GPE在各种温度下在充放电周期中表现出卓越的性能.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
聚合物化学聚合物化学

背景情况:

凝聚合物电解质 (GPEs) 是金属电池 (LMB) 液体电解质的有希望的替代品.
它们的半固体性质使得GPE适用于灵活的电子产品和可穿戴设备.
开发稳定的接口对于高性能LMB至关重要.

研究的目的:

通过使用稀释剂调节电解质结构来开发稳定的GPE.
为了研究稀释剂对电化学稳定性和离子传输的影响.
为了提高LMB的性能,用于实际应用.

主要方法:

由易斯酸启动的1,3-二氧化 (DOL) 的环开聚合.
加入1,1,2,2-四乙醇2,2,3,3-四乙烯 (TTE) 作为稀释剂.
使用FTIR,NMR,凝透色谱 (GPC),实验测试和模拟进行表征.

主要成果:

与未稀释版本相比,与稀释剂混合的GPE显示出更好的电化学稳定性和离子传输.
FTIR,NMR和GPC证实了成功的聚合和分子量分布.
添加TTE促进了离子联结,并在阳极上形成了强大的低阻抗固体电解质介相 (SEI).

结论:

添加TTE有效地调节了GPE中的溶解结构.
开发的GPE可在室温下实现5°C的充放电,在-20°C下实现200个循环.
这种方法推进了基于GPE的LMB的设计,以提高安全性和性能.

关键词:

凝聚合物的电解质凝.离子配对是一种离子配对.离子溶解的离子溶解方法金属电池是一种金属电池.固体电解质相间阶段

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