Polymer electrolytes with robust mechanical properties and high ionic conductivity are highly desirable for solid-state 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 carbon-based 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.
|Journal||Chemical Engineering Journal|
|Publication status||Published - 2021 May 15|
Bibliographical noteFunding Information:
This work was supported by a National Research Foundation (NRF) of South Korea grant funded by the Ministry of Science, ICT and Future Planning ( NRF-2018M3A7B4071535 , NRF-2017R1D1A1B06028030 ).
This work was supported by a National Research Foundation (NRF) of South Korea grant funded by the Ministry of Science, ICT and Future Planning (NRF-2018M3A7B4071535, NRF-2017R1D1A1B06028030).
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering