Thermally and Mechanically Durable Double Network Ionogel Electrolyte for Flexible Energy Storage Devices
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초록
내용
Amongst all flexible electrolyte, gel electrolytes have been considered to be the best option; however, they suffer from trade-off between ion transport and mechanical properties, as well as strength and toughness. Here, we demonstrate highly ion-conducting, stretchable, and ultradurable double network (DN) ionogel films, in which ionic liquids (ILs) are confined in chemically-coupled complementary DNs consisting of hard and soft polymers as characterized by FT-IR spectroscopies. Even at 100°C, the DN ionogel film demonstrates remarkable properties, such as ionic conductivity around 102 mS cm−1, the tensile strength of 1.4 MPa, stretchability of 500%, and dissipation energy of 216 kJ m−3. Thus, the high temperature operating, flexible supercapacitors (hfSCs) based on DN ionogels achieve outstanding capacitive performances such as energy densities of 51 Wh kg-1 at 180 °C and ~90 % of its initial capacitance over 100000 cycles at 150 °C.