Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

Liu, Changhao; Tang, Xiaomin; Wang, Yangyang; Sacci, Robert L.; Bras, Wim; Keum, Jong K.; Chen, X. Chelsea

doi:10.1021/acsmacrolett.2c00040

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

Journal Article · Mon Apr 11 00:00:00 EDT 2022 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.2c00040· OSTI ID:1876274

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1876274

Journal Information:: ACS Macro Letters, Journal Name: ACS Macro Letters Journal Issue: 4 Vol. 11; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
crystallinity
crystallization
electrical conductivity
ionic conductivity
x-ray scattering

Ionic Conductivity Enhancement of Polymer Electrolytes by Directed Crystallization

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