The Design of Zwitterion Containing Quasi-Solid-State Polymer Electrolyte for High-Performance Supercapacitors
발표자
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초록
내용
A quasi-solid-state polymer electrolyte (QPE) is prepared by combining a solid-state poly(ethylene glycol) (PEG) network with a liquid electrolyte mixture of ionic liquids and zwitterions for high-performance supercapacitors using activated carbon electrodes. The QPE exhibits a high ionic conductivity σ (2.8 x 10-3 S/cm at 303 K) as well as high shear modulus G’ (3.8 x 104 Pa at 298 K). The zwitterion-containing QPE shows even higher static dielectric constant (εs = 69) than the zwitterion-free QPE (εs = 48). The improved εs leads to an increase in conducting ion concentration p, because more ions can be dissociated by lowering Coulomb energy (Ec ~ 1/εs) in the QPE. The zwitterion-containing QPE-based supercapacitor also shows high electrochemical performance; i.e., the incorporation of zwitterion results in an increase in specific capacitance (Cs) from 98 to 195 F/g at a current density of 0.2 A/g.