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基于聚乙烯氧化物和聚二的热塑性弹性体用于固体电解质

Ding-Li Xia¹, Shi-Peng Ding¹, Ze Ye¹

¹National Key Laboratory of Biobased Transportation Fuel Technology, International Research Center for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, China.

Materials (Basel, Switzerland)

|May 11, 2024

概括

新的聚乙烯基聚乙烯-1-硫酸-聚乙烯氧化物-聚乙烯-1-硫酸 (PVPS-b-PEO-b-PVPS) 三环共聚合物被合成并与二三甲硫化物 (LiTFSI) 合,以创建离子电池的固体聚电解质.

科学领域:

聚合物科学聚合物科学
材料科学材料科学材料科学
电化学电化学电化学

背景情况:

固体聚合物电解质 (SPEs) 对于开发更安全,更高效的离子电池至关重要.
特里布洛克共聚物为先进材料应用提供可调节的特性.
基于聚乙烯氧化物 (PEO) 的电解质在离子导电性和机械强度方面面临挑战.

研究的目的:

合成和表征具有PEO中间块和PVPS外部块的新型ABA三块化共聚合物 (tri-BCP).
研究PVPS含量和LiTFSI兴奋剂对三BCP/LiTFSI混合体微相分离和热性能的影响.
评估这些PVPS-b-PEO-b-PVPS/LiTFSI混合体作为离子电池的固体电解质的潜力.

主要方法:

合成PVPS-b-PEO-b-PVPS三块式共聚物.
用二-三甲-硫) 胺化物 (LiTFSI) 对三-BCP进行兴奋剂.
使用小角度X射线散射 (SAXS) 来研究微相分离的表征.
热分析 (化温度,玻璃过渡温度) 和机械性能评估.
离子导电性测量. 离子导电性测量.

主要成果:

所有三BCP都形成了不对称的叶片结构,PVPS体积分数在12.9%至26.1%之间.
微相分离强度随着PVPS分数的增加而增加,但随着兴奋剂比率的下降而减少,影响热性质.
与PEO/LiTFSI混合物相比,PVPS-b-PEO-b-PVPS/LiTFSI混合物表现出更高的模量和离子导电性.
增强的离子导电性归因于PVPS块,有助于Li+离子解离.

结论:

与LiTFSI合的PVPS-b-PEO-b-PVPS三环共聚合物显示出作为固体电解质的有希望的特性.
聚乙烯外块有助于提高机械强度和离子导电性.
这些材料有可能用于下一代离子电池.

关键词:

区块共聚物的区块共聚物.电气性能电气性能电气性能机械强度机械强度机械强度聚二二离子固体电解质是一种固体电解质.

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