Rheological and light scattering analyses for characterizing phase separation of polymer solutions in lithium-ion battery separator coating system

Ju Yeon Lee, Seong Hwan Kim, Seong Eun Park, Joo Sung Lee, Hyun Wook Jung

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Nonsolvent-induced phase separation is a widely used technique in the manufacture of polymeric separators. This method involves fine-tuning porous structures through the phase separation of polymer solutions in Li-ion secondary battery systems. The phase separation properties and kinetics of heat-resistant poly(vinylidene fluoride-co-hexafluoropropylene) polymer solutions were characterized by adjusting the weight ratio of N-methyl-2-pyrrolidone (NMP) as a solvent and water as a nonsolvent using both macro- and micro-rheological techniques. The viscoelastic moduli, measured with a rotational rheometer as a macro-rheological technique, and autocorrelation functions describing the fast movements of tracer ceria particles within polymer solutions—quickly detected using the micro-rheological light scattering technique of multi-speckle diffusing wave spectroscopy—offered a comprehensive assessment of the phase separation status and its kinetics during changes in the NMP/water ratio. These results are expected to play a fundamental role in understanding and controlling the pore structures of actual separator membranes applied in Li-ion battery systems. Graphical abstract: (Figure presented.)

    Original languageEnglish
    Pages (from-to)179-192
    Number of pages14
    JournalKorea Australia Rheology Journal
    Volume36
    Issue number3
    DOIs
    Publication statusPublished - 2024 Aug

    Bibliographical note

    Publisher Copyright:
    © Korean Society of Rheology 2024.

    Keywords

    • Binodal curve
    • Membrane structure
    • Multi-speckle diffusing wave spectroscopy
    • Nonsolvent-induced phase separation
    • Phase separation kinetics
    • Rheological properties

    ASJC Scopus subject areas

    • General Materials Science
    • Condensed Matter Physics

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