基于聚乙二醇接枝丙烯酸树酯光固化电解质的制备及性能研究

聚氧化乙烯(PEO)(聚乙二醇(PEG))和丙烯酸树脂在聚合物基电解质中具有很好的应用,本文通过紫外光引发单/双官能度的聚乙二醇接枝丙烯酸树脂单体聚合构建了离子电导率高、易于封装,可避免电解质泄漏的准固态聚合物电解质.通过调控聚乙二醇二甲基丙烯酸酯(PEGDA)和甲氧基聚乙二醇单甲基丙烯酸酯(PEGMA)2种单体的比例以及锂盐溶液的含量,成功制备出具有高离电导率的准固态聚合物电解质.采用傅里叶变换红外光谱仪(FTIR),电化学工作站对PEGMA/PEGDA基聚合物电解质进行表征,研究各组分比例对电解质的电化学性能影响.当PEGMA/PEGDA单体比例为75/25,锂盐溶液的占比为75%时,形成的薄膜状态电解质表现出1.96×10^?3 S·cm^?1的高离子电导率,较原始配比提高了14倍.将制备的电解质应用于电致变色器件,在580个变色循环后,器件依然可以实现稳定快速的颜色切换,2种颜色变换时间均在3 s以内,本文中研究的聚醚接枝丙烯酸树酯基电解质材料在电致变色器件中有较好的应用前景.

Preparation and Properties of Photo-cured Electrolyte Based on Poly(ethylene glycol)Grafted Acrylic Resin

Poly(ethylene oxide)(PEO)(poly(ethylene glycol)(PEG))grafted acrylic resin had been widely used as polymer electrolytes.In this paper,quasi-solid polymer electrolytes(QSPE)with high conductivity were prepared and studied by UV-curing of poly(ethylene glycol dimethacrylate)(PEGDA)and methoxypolyethylene glycol methacrylate(PEGMA).The electrolytes could be easy to be fabricated into membranes and simply encapsulated in electrochemical devices,espacially in electrochromic devices(EDCs).The process of the PEGDA and PEGMA polymerization was mainly confirmed by Fourier-transform infrared spectroscopy(FTIR).The electrochemical performance of the electrolytes was characterized by an electrochemical workstation,and the ion conductivities with the various concentrations of liquid electrolyte and weight ratios of monomers were investigated.When the content of lithium salt solution was 75%and the weight ratio of PEGMA to PEGDA was 75:25,the ionic conductivity of the electrolytes reached 1.96×10^?3 S·cm^?1,which was 14 times higher than that of the original.In order to verify its application performance,electrochromic devices was assembled with the obtained electrolyte membrane as an ion transport layer and exhibited high efficiency of color changes.The EDCs still exhibited stable and reversible color switching between gray blue and bright yellow even after 580 cycles,and the response time was less than 3 s.Because of its good electrochemical property and easy encapsulating,the electrolytes based on polyether grafted acrylic resins also held extensive prospects in other electrochemical devices.