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Preparation of polymer electrolyte membranes for lithium batteries by radiation-induced graft copolymerization

机译:辐射诱导的接枝共聚制备锂电池用高分子电解质膜

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摘要

Polymer electrolyte membranes with different degrees of grafting were prepared by radiation-induced graft copolymerization of styrene monomer onto poly(vinylidene fluoride) (PVDF) films and subsequent chemical activation with liquid electrolyte consisting of lithium hexafluorophosphate (LiPF6) in a mixture of ethylene carbonate/diethylene carbonate (EC/DEC). The chemical changes in the PVDF films after styrene grafting and subsequent chemical activation were monitored by FTIR spectroscopic analysis and the crystallinity was evaluated using differential scanning calorimetric (DSC) analysis. The swelling in electrolyte solution (electrolyte uptake) and the ionic conductivity of the membranes were determined at various degrees of grafting. The conductivity of the membranes was found to increase with the increase in the degree of grafting and reached a magnitude of 10-3 S/cm at a degree of grafting of 50%. The results of this work suggest that radiation-induced graft polymerization provides an alternative method to substitute blending in preparation of polymer electrolyte membranes for application in lithium batteries.
机译:通过将苯乙烯单体辐射诱导接枝共聚到聚偏二氟乙烯(PVDF)薄膜上,然后用六氟磷酸锂(LiPF6)在碳酸亚乙酯/碳酸亚乙酯的混合物中进行化学活化来制备具有不同接枝度的聚合物电解质膜碳酸二亚乙酯(EC / DEC)。通过FTIR光谱分析监测苯乙烯接枝后PVDF膜中的化学变化和随后的化学活化,并使用差示扫描量热(DSC)分析评估结晶度。在不同的接枝度下测定电解质溶液的溶胀(电解质吸收)和膜的离子电导率。发现膜的电导率随接枝度的增加而增加,并且在接枝度为50%时达到10-3S / cm的量级。这项工作的结果表明,辐射诱导的接枝聚合提供了一种替代方法来替代共混方法,以制备用于锂电池的聚合物电解质膜。

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