The electrical properties of Highly flexible ion gel capacitor based on PVDF

With the development of flexible electronics, ion gel has numerous applications in flexible devices, and it is crucial to explore the properties of ion gels. In this study, the ion gel is generated by loading the ionic liquid 1-Ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl) imide in polymer Poly (vinylidene fluoride). The electrical characteristics were studied as a function of ionic liquid concentration, thickness, and temperature. The results show that the capacitance value with 20 % ionic liquid concentration can be as high as 2 μF/cm² at 1 Hz, and the capacitance value is not affected by the gel thickness at frequencies lower than 1 kHz; the capacitance exhibits a positively correlated with the temperature in the temperature range of 30–80 °C; the capacitance is unaffected by bending curvature less than 1.67 mm⁻¹. Meanwhile, we also established different circuit models to simulate the ion gel capacitors with different ionic concentrations, which provides a theoretical basis for flexible transistors.