电解质
超级电容器
电容
准固态
乙腈
材料科学
大气温度范围
离子电导率
聚合物
化学工程
分析化学(期刊)
电极
电化学
化学
色谱法
复合材料
物理化学
热力学
物理
工程类
色素敏化染料
作者
Hansol Yong,Habin Park,Cheolsoo Jung
标识
DOI:10.1016/j.jpowsour.2019.227390
摘要
A quasi-solid-state gel polymer electrolyte (GPE) is designed by integrating a free-standing cross-linked film and an injectable polymer electrolyte for applications in acetonitrile-based supercapacitors (SCs) using activated carbon (AC) electrodes. The synthesized GPE exhibits a high ionic conductivity over a wide temperature range (~1.7 × 10−3 S cm−1 at −20 °C to ~7.9 × 10−3 S cm−1 at 60 °C) as well as thermal stability and flexibility. A quasi-solid-state SC equipped with the GPE exhibits ~13% higher specific capacitance (~56% smaller Warburg resistance) at room temperature (RT) than that of an SC containing a corresponding liquid electrolyte. The quasi-solid-state SC also exhibits excellent electrochemical characteristics over a temperature range of −20 to 60 °C with only ~23% capacitance loss at −20 °C compared to that at RT. Furthermore, the quasi-solid-state SC maintains ~93% of its initial capacitance (only ~4% increase in ESR) after 120-h storage at 85 °C (above the boiling point of acetonitrile). This capacitance is superior to an SC equipped with a film-only GPE (~73% capacitance retention and ~270% increase in ESR). The proposed strategy provides new insights into the development of GPE designs for practical applications to solid-state SCs operating over a wide temperature range.
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