Macroporous polymer electrolytes based on PVDF/PEO-b-PMMA block copolymer blends for rechargeable lithium ion battery

Abstract A novel macroporous polymer electrolyte based on poly(vinylidene fluoride) (PVDF) and poly(ethylene oxide)- block -poly(methyl methacrylate) (PEO -b- PMMA) block copolymers blends was prepared by a phase inversion technique. The crystallinity of the polymer matrix was found to decrease with increase of PEO -b- PMMA content, which was confirmed by DSC thermal analyses. The pore structure and connectivity could be improved with addition of PEO -b- PMMA in the polymer matrix. The resulting macroporous polymer electrolyte exhibited high ionic conductivity, 2.79 × 10 −3  S cm −1 at room temperature, and a good electrochemical stability up to 5.0 V (vs. Li/Li + ). These results showed that it is of great potential application in polymer lithium ion batteries.

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