聚(丙烯腈-甲氧基聚乙二醇单丙烯酸酯-丙烯酸锂)的制备与表征

采用乳液聚合方法制备了锂离子电池凝胶电解质用丙烯腈-甲氧基聚乙二醇(350)单丙烯酸酯-丙烯酸锂共聚物. 利用红外光谱(IR), 差示扫描量热法(DSC)对共聚物结构进行了表征. 利用倒相法制备了共聚物微孔膜, 使聚(丙烯腈-甲氧基聚乙二醇(350)单丙烯酸酯)共聚物的溶解性能得到了显著提高, 同时, 还改善了膜的收缩性. 采用交流阻抗方法测试了凝胶电解质膜在室温下的电导率, 结果表明, 该凝胶电解质具有较高的离子电导率, 能满足现有锂离子电池使用要求.

Preparation and Characterization of Poly(acrylonitrile-methoxy polyethylene glycol (350) monoacrylate-lithium acrylate)

The ternary copolymer of acrylonitrile(AN),methoxy polyethylene glycol(350)monoacrylate(MPGA),and lithium acrylate(LiAc)which can be used as gel electrolyte for lithium ion batteries was prepared by radical emulsion polymerization.This improved the solubility of poly(acrylonitrile-methoxy polyethylene glycol(350)monoacrylate),and meanwhile,decreased the contraction of the membrane made from the polymer.The solubility of the ternary copolymer and the contraction of the prepared microporous membrane by phase-inversion methods were improved by way of copolymerization.Several products were characterized by infrared(IR)absorption spectroscopy and differential scanning calorimetry(DSC).The ionic conductivity of the gel electrolyte membrane at ambient temperature was tested by AC impedance.The results showed that the as-prepared gel copolymer electrolyte microporous membranes had higher ionic conductivity and were promising materials for lithium ion batteries.