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MICROPOROUS PVDF-HFP-BASED POLYMER MEMBRANES FORMED FROM SUPERCRITICAL CO₂ INDUCED PHASE SEPARATION

Membrane Technology and Engineering Research Center, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

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Bao-ku Zhu

Institute of Polymer Science, Zhejiang University, Hangzhou Yuquan 310027, China

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Dan-ying Zuo

Institute of Polymer Science, Zhejiang University, Hangzhou Yuquan 310027, China

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You-yi Xu

Institute of Polymer Science, Zhejiang University, Hangzhou Yuquan 310027, China

Corresponding author.

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Ji-ding Li

Membrane Technology and Engineering Research Center, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

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Abstract

Microporous poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membranes following supercritical CO₂ induced phase separation process were prepared using four solvents. The solid electrolytes of PVDF-HFP were formed by microporous PVDF-HFP membranes filled and swollen by a liquid electrolyte. The effect of the solvents on the morphology and structure, electrolyte absorptions and lithium ionic conductivity of the activated membranes were investigated. It was approved that all the membrane had the similar "sponge-like" and asymmetric structure when different solvent was used. As the mutual affinity between solvent and supercritical CO₂ decreased, the membrane porosity and the average pore diameter increased. The PVDF-HFP membrane with porosity at 88% and pore size at 10 μm were successfully prepared. The uptake of electrolyte solution and lithium ionic conductivity could reach 487 wt% and 3.09 × 10^-3 S/cm respectively for obtained membrane.

This work was financially supported by the China Postdoctoral Science Foundation (No. 20060400436), the National Nature Foundation of China (No. 50433010) and the National 973 Foundation of China (No. 2003CB615705).

Keywords:

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