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

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2024-07-02 DOI:10.1007/s13367-024-00097-y

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

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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

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流变学和光散射分析表征锂离子电池隔膜涂层系统中聚合物溶液的相分离特性

非溶剂诱导相分离是聚合物隔膜制造中广泛使用的一种技术。这种方法是通过锂离子二次电池系统中聚合物溶液的相分离来微调多孔结构。利用宏观流变学和微观流变学技术，通过调整作为溶剂的 N-甲基-2-吡咯烷酮（NMP）和作为非溶剂的水的重量比，对耐热聚（偏氟乙烯-六氟丙烯）聚合物溶液的相分离特性和动力学进行了表征。使用旋转流变仪（一种宏观流变学技术）测量的粘弹性模量和描述示踪铈粒子在聚合物溶液中快速运动的自相关函数（使用多斑扩散波光谱的微流变学光散射技术快速检测），对 NMP/水比例变化过程中的相分离状态及其动力学进行了全面评估。这些结果有望为理解和控制锂离子电池系统中实际应用的隔膜的孔隙结构发挥重要作用。图摘

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.