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    Excellent film-forming, ion-conductive, zwitterionic graft copolymer electrolytes for solid-state supercapacitors

    Year: 2021

    Journal: Chem. Eng. J., Volume 412, MAY 15

    Authors: Min, Hyo Jun; Park, Min Su; Kang, Miso; Kim, Jong Hak

    Organizations: National Research Foundation (NRF) of South Korea - Ministry of Science, ICT and Future Planning [NRF-2018M3A7B4071535, NRF-2017R1D1A1B06028030]

    Keywords: Zwitterion; Graft copolymer; Polymer electrolyte; Solid supercapacitor; Ion conductivity

    Polymer electrolytes with robust mechanical properties and high ionic conductivity are highly desirable for solidstate energy storage devices. Therefore, in this study, a polymer electrolyte based on a zwitterionic graft copolymer, poly(vinyl alcohol)-graft-poly(sulfobetaine methacrylate) (PVA-g-PSBMA), is developed. Herein, we designed a graft copolymer that utilizes the excellent film-forming nature of PVA main chains and ion-conductive properties of polyzwitterionic PSBMA side chains. The PVA-g-PSBMA electrolytes exhibited microphase separated structures, wherein H3PO4 interacted more strongly with the PSBMA domains. Therefore, the transport of proton ions was facilitated through the well-defined PSBMA-based ion channels, leading to a significant increase in the ionic conductivity. The polymer electrolyte was applied to the electric double-layer capacitor (EDLC) with activated carbonbased electrode. In comparison with the neat conventional PVA-based cell, the solid EDLC with PVA-g-PSBMA zwitterionic graft copolymer electrolytes showed improved specific capacitance (46.6 F g-1), energy density (3.67 Wh kg- 1), and power density (186 W kg-1). The improved performance can be attributed to the higher ionic conductivity and better interfacial compatibility of electrode/electrolyte for the PVA-g-PSBMA electrolytes.
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