无机材料学报2021，Vol.36Issue(2)：161-167,7.DOI:10.15541/jim20200376
基于高电导率的疏水气相SiO2复合凝胶电解质的高性能电致变色器件
High-conductivity Hydrophobic Fumed-SiO2 Composite Gel Electrolyte for High Performance Electrochromic Devices
摘要
Abstract
Gel electrolytes are chemically stable, nonflammable and easy to encapsulate, however, their moderate ionic conductivity (10-4-10-5 S·cm-1) hinders their further development for the usage in electrochromic devices (ECDs). Here, we developed a highly conductive hydrophobic SiO2/PMMA/PC/LiClO4 gel polymer electrolyte (H-SiO2 GPE). Electrochemical behaviors of ECDs were characterized by electrochemical impedance spectroscope (EIS), cyclic voltammetry (CV) and chronoamperometry (CA). Systematic analyses show that the ionic conductivity of the H-SiO2 GPE can reach 5.14 mS·cm-1 (at 25 ℃) by introducing only 0.5wt％ hydrophobic fumed SiO2. This increase is due to the good compatibility and hydrophobic-hydrophobic attractions between SiO2 additive and organic electrolyte, which promotes the dissociation of lithium perchlorate. Additionally, the viscosity as a function of shear rate for GPE with various fumed silica contents shows the behavior of shear thinning, which indicates the formation of a three-dimensional network structure. This structure provides ion transport channels, leading to a clearly improved switching speed for ECDs assembled with hydrophobic SiO2 GPEs (tbleaching=4 vs 8 s and tcoloring=14 vs 16 s). Similarly, the investigation of hydrophobic fumed SiO2 in liquid electrolyte is demonstrated that the ionic conductivity of LiClO4/PC liquid electrolyte without and with hydrophobic fumed SiO2 increases from 6.94 to 7.58 mS·cm-1, respectively. Therefore, hydrophobic fumed SiO2 as a filler has a positive effect on electrolytes, and the proposal of the H-SiO2 GPE provides a new idea for offsetting the trade-off between a high ionic conductivity and easy leakage when applied in ECDs.关键词
凝胶电解质/电致变色/疏水性/SiO2Key words
gel electrolyte/electrochromic/hydrophobic/SiO2分类
化学化工引用本文复制引用
赵起,乔科,姚勇吉,陈长,陈东初,高彦峰..基于高电导率的疏水气相SiO2复合凝胶电解质的高性能电致变色器件[J].无机材料学报,2021,36(2):161-167,7.基金项目
Ministry of Science and Technology of China (2016YFB0303901-05) （2016YFB0303901-05）
Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-09-E00020) （2019-01-07-00-09-E00020）
Science and Technology Commission of Shanghai Municipality (18JC1412800) （18JC1412800）
Cheung Kong Scholars Programme of China (T2015136) （T2015136）
