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Phase behavior of binary and ternary fluoropolymer (PVDF-HFP) solutions for single-ion conductors
RSC Advances ( IF 3.9 ) Pub Date : 2022-08-02 , DOI: 10.1039/d2ra04158h
Jung Yong Kim 1, 2
Affiliation  

A fluoropolymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) has a dielectric constant of ∼11, providing charge screening effects. Hence, this highly polar PVDF-HFP material has been employed as a matrix for solid polymer electrolytes (SPEs). In this study, the phase behavior of binary PVDF-HFP solutions was analyzed using the Flory–Huggins theory, in which ethylene carbonate, propylene carbonate, dimethyl carbonate, γ-butyrolactone, and acetone were employed as model solvents. In particular, for the binary PVDF-HFP/acetone system, the solid–liquid and liquid–liquid phase transitions were qualitatively described. Then, the phase diagram for ternary acetone/PVDF-HFP/polyphenolate systems was constructed, in which the binodal, spinodal, tie-line, and critical point were included. Finally, when a polyelectrolyte lithium polyphenolate was mixed with the PVDF-HFP matrix, it formed a single-ion conductor with a Li+ transference number of 0.8 at 23 °C. In the case of ionic conductivity, it was ∼10−5 S cm−1 in solid state and ∼10−4 S cm−1 in gel state, respectively.

中文翻译:

用于单离子导体的二元和三元含氟聚合物 (PVDF-HFP) 溶液的相行为

一种含氟聚合物聚(偏二氟乙烯-hexafluoropropylene) (PVDF-HFP) 的介电常数约为 11,提供电荷屏蔽效应。因此,这种高极性 PVDF-HFP 材料已被用作固体聚合物电解质 (SPE) 的基质。在这项研究中,使用 Flory-Huggins 理论分析了二元 PVDF-HFP 溶液的相行为,其中碳酸亚乙酯、碳酸亚丙酯、碳酸二甲酯、γ-丁内酯和丙酮用作模型溶剂。特别是,对于二元 PVDF-HFP/丙酮体系,定性描述了固-液和液-液相变。然后,构建了三元丙酮/PVDF-HFP/多酚体系的相图,其中包括双节线、旋节线、联络线和临界点。最后,当聚电解质多酚锂与 PVDF-HFP 基体混合时,+ 23 °C 时转移数为 0.8。在离子电导率的情况下,固态为~10 -5 S cm -1 ,凝胶态为~10 -4 S cm -1
更新日期:2022-08-02
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