Preparation and properties of gel membrane containingporous PVDF-HFP matrix and cross-linked PEG for lithium ion conduction |
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Authors: | ZHANG Mei CUI Zhenyu ZHU Baoku HAN Gaige XU Youyi ZHANG Aiqing |
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Affiliation: | 1.Institute of Polymer Science, Zhejiang University; 2.College of Chemistry and Materials Science, South-Central University for Nationalities; |
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Abstract: | Lithium ion conducting membranes are the key materials for lithium batteries. The lithium ion conducting gel polymer electrolyte membrane (Li-GPEM) based on porous poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix and cross-linked PEG network is prepared by a typical phase inversion process. By immersing the porous PVDF-HFP membrane in liquid electrolyte containing poly(ethylene glycol) diacrylate (PEGDA) and an initiator to absorb the liquid electrolyte at 25°C, and then thermally cross-linking at 60°C, the Li-GPEM is fabricated successfully. The measurements on its weight loss, mechanical and electrochemical properties reveal that the obtained Li-GPEM has better overall performance than the liquid and blend gel systems used as conductive media in lithium batteries. The ionic conductivity of the fabricated Li-GPEM can reach as high as 2.25 × 10-3 S/cm at 25°C. |
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