Salt-in-polyampholyte for high-voltage aqueous quasi-solid supercapacitors
발표자
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초록
내용
Hydrogel electrolytes have been intensively studied for a decade, due to their outstanding intrinsic physical properties. However, due to their low mechanical strength and poor ionic conductivity at low temperatures, many researchers have been focusing on improving these issues. Thus, in our study, we prepared salt-in-polyampholytes (SIPA) that have two different counterions (Li+ and Cl-) in an aqueous medium. Polyampholyte (PA) improves mechanical properties by inducing an ionic strength between opposite charges in polymer chains. Also, we introduced salt into our PA system, presumably giving non-freezable properties and an application at high-voltage (~2.0 V) for supercapacitors. Consequently, this SIPA-based supercapacitor delivers a high specific capacitance (Cs = 194 F/g) at 5 mV/s, and the capacitance retention shows 82% after 4000 cycles at 5 A/g. Besides, under mechanically bending and rolling deformations, this flexible supercapacitor exhibits the capacitance retention of 88% after 100 cycles at 2 A/g.