聚偏氟乙烯基凝胶聚合物电解质的研究进展

Research progress of polyvinylidene fluoride based gel polymer electrolyte

凝胶聚合物电解质(gel polymer electrolyte,GPE)作为液体电解质向固体电解质过渡的一个中间产物,因可以综合液体电解质和固体电解质的优点而受到广泛关注。聚偏氟乙烯及其共聚物聚偏氟乙烯-六氟丙烯拥有较高的介电常数,这有利于锂离子的电离、离子电导率的提高,进而能够改善锂离子电池的电化学性能,因此,是一种具有应用潜力的制备GPE的聚合物材料。本文综述了近五年基于聚偏氟乙烯GPE的研究进展,重点介绍了以下四类GPE:①基于聚偏氟乙烯以及聚偏氟乙烯-六氟丙烯的单一聚合物GPE;②与其他聚合物材料(如聚丙烯酸甲酯、聚间苯二甲酰胺、聚丙烯腈等)的复合GPE;③与无机纳米材料(如三氧化二铝、二氧化硅、氧化石墨烯等)复合的GPE;④其他新型(聚偏氟乙烯类聚合物与纤维素复合)的GPE研究进展。本文简述了各类复合GPE的优势和面临的挑战,最后,分析了基于聚偏氟乙烯GPE在产业化应用过程中面临的问题,并展望了此类GPE未来的发展方向和研究重点。

In between liquid electrolyte and solid electrolyte,gel polymer electrolyte(GPE)has attracted enormous interests because it can combine the advantages of liquid electrolyte and solid electrolyte.Polyvinylidene fluoride and its copolymer polyvinylidene fluoride-hexafluoropropylene have a high dielectric constant,which is conducive to the ionization of lithium ions,the improvement of ion conductivity,and thus can improve the electrochemical performance of lithium ion batteries.Is a kind of polymer material with application potential for preparing GPE.This article introduces the research progress of GPE based on polyvinylidene fluoride in the past five years,It focuses on the following four categories of GPE:(1)single polymer GPE based on polyvinylidene fluoride or polyvinylidene fluoride-hexafluoropropylene,(2)polymer composite GPE with other polymers(such as polymethyl acrylate,Polyisophthalamide,polyacrylonitrile,etc.),(3)composite GPE with inorganic nanomaterials(such as Aluminum oxide,silicon dioxide,Graphene oxide,etc),and(4)other new Other new types(polyvinylidene fluoride polymer and cellulose composite)GPEs.This article briefly describes the advantages and challenges of various types of composite GPE.Finally,the key problems for GPE industrialization were analyzed and some prospects for the future research directions of GPE were proposed.