离子导电性和基于固体类PEO的聚合物电解质的机械性能之间的相关性
Agathe Naboulsi1,2,3, Ronan Chometon2,3,4, François Ribot2
1LPPI, CY Cergy Paris Université, F-95000 Cergy, France.
ACS applied materials & interfaces
|March 11, 2024
概括
本研究探讨了用于固态电池的基于聚乙烯糖醇的聚合物网络. 更高的聚合物灵活性和更低的交叉连接密度提高了离子导电性,这对电池性能至关重要.
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:
- 聚乙烯甘甲基乙甲酸聚合物网络 (基于PEO的网络) 是金属所有固态电池的有前途的电解质.
- 提高对其物理化学特性的理解对于满足电池电解质要求至关重要.
研究的目的:
- 研究交叉连接密度和乙烯氧化物/比对 PEO 网络的机械性能和离子导电性的影响.
- 对优化固体聚合物电解质 (SPEs) 和单离子SPEs (si-SPEs) 的机械性能进行离子导电的相关性.
主要方法:
- 合成基于PEO的交联聚合物 (si-SPEs和SPEs) 使用无溶剂基共聚合.
- 使用的3-[三甲) 硫胺硫]甲酸盐 (LiMTFSI),聚乙烯糖醇) 甲基乙醇甲酸盐 (PEGM) 和聚乙烯糖醇) 二甲酸盐 (PEGDM).
- 纳入 LiTFSI 作为 SPEs 中的离子物种.
主要成果:
- 大多数合成的聚合物薄膜是无形的,自立的,灵活的,均的和热稳定的.
- 在SPE和si-SPE系列中观察到离子导电性和机械性能之间存在很强的相关性.
- 离子导电性随着玻璃过渡温度,α放松温度和储存模量下降而增加.
结论:
- +运输受到聚合物链灵活性和+/EO相互作用的显著影响.
- 在基于PEO的网络中,降低机械刚性和增加链的流动性提高了离子导电性.
- 这些发现为设计用于金属电池的先进固体聚合物电解质提供了洞察力.
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