Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization,ACS Macro Letters

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Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-04-11 , DOI: 10.1021/acsmacrolett.2c00040
Changhao Liu ₁ , Xiaomin Tang ₁ , Yangyang Wang ₂ , Robert L Sacci ₁ , Wim Bras ₁ , Jong K Keum _{2,

3} , X Chelsea Chen ₁

Affiliation

We report that hot stretching of poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) can lead to a preferred orientation of PEO crystalline lamellae, thereby reducing the tortuosity of the ion-conduction pathway along the thickness direction of the SPE film, causing improved ionic conductivity. The hot stretching method is implemented by stretching SPE films above the melting point of PEO in an inert environment followed by crystallization at room temperature while maintaining the applied strain. The effect of hot stretching on the crystalline orientation, crystallinity, morphology, and ion transport in PEO with two types of salts, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium triflate (LiCF₃SO₃), is investigated in detail. Wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) show that the orientation of PEO crystalline lamellae induces the formation of a short ion-conduction pathway along the through-plane direction of the SPE films, leading to 1.4- to 3.5-fold enhancement in the through-plane ionic conductivity.

中文翻译：

定向结晶提高聚合物电解质的离子电导率

我们报告了聚（环氧乙烷）（PEO）基固体聚合物电解质（SPE）的热拉伸可以导致PEO结晶薄片的优选取向，从而减少离子传导路径沿SPE厚度方向的曲折度膜，提高离子电导率。热拉伸方法是通过在惰性环境中将 SPE 薄膜拉伸到 PEO 的熔点以上，然后在室温下结晶，同时保持施加的应变。_{热拉伸对双（三氟甲磺酰）亚胺锂（LiTFSI）和三氟甲磺酸锂（LiCF 3} SO ₃）两种盐在PEO中的结晶取向、结晶度、形貌和离子传输的影响)，详细研究。广角 X 射线散射 (WAXS) 和小角 X 射线散射 (SAXS) 表明，PEO 晶体薄片的取向导致沿 SPE 薄膜的平面方向形成短的离子传导路径，导致通过平面离子电导率提高 1.4 到 3.5 倍。

更新日期：2022-04-11

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