材料科学
电解质
离子键合
离子液体
电化学
离子电导率
化学工程
制作
相(物质)
储能
离子
超级电容器
电极
热力学
有机化学
化学
工程类
物理
病理
物理化学
医学
催化作用
功率(物理)
替代医学
作者
Xiaoqing Ming,Yang Xiang,Le Yao,Wenqing He,He Zhu,Qi Zhang,Shiping Zhu
标识
DOI:10.1021/acsami.2c15446
摘要
Ionic switches with a positive temperature coefficient (PTC) effect are highly desirable in the fabrication of smart electrolytes for the safety protection of electrochemical energy devices. However, most of them encounter liquid leaking or volume shrinking problems, limiting their long-term and stable operations. Herein, a PTC-type ionic switch is introduced based on a poly(acrylic acid) (PAA) hydrogel soaked by calcium acetate (CaAc), with a resistance change of six times in maximum between the homogeneous and phase separated state. The PTC effect is owing to the strong phase separation upon heating where the ion transport is restricted. Such a hydrogel-based PTC-type ionic switch is in the solid state and isochoric during phase separation without leaking or shrinking issues. The influence of different CaAc soaking concentrations is investigated. A simplified model consisting of interconnected ion channels is proposed based on microstructure analysis. A smart supercapacitor is successfully demonstrated by this PTC ionic switch with a safety protection ability. The research here would provide a new pathway for the design and development of PTC-type ionic switches in the safety protection of electrochemical energy storage devices.
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