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Issue 20, 2016
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An amphiphilic block–graft copolymer electrolyte: synthesis, nanostructure, and use in solid-state flexible supercapacitors

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Abstract

We report a highly ionic conductive amphiphilic nanostructured polymer electrolyte with good flexibility for solid-state flexible supercapacitors. It is based on a block–graft copolymer, i.e., poly(styrene-b-butadiene-b-styrene)-g-poly(oxyethylene methacrylate) (SBS-g-POEM) synthesized via one-pot free-radical polymerization. The SBS-g-POEM comprises hydrophobic SBS main chains and hydrophilic POEM side chains, providing mechanical strength and ion conducting properties, respectively. Preferential interactions of POEM with a salt and the morphological evolution of SBS-g-POEM electrolytes were demonstrated. A well-defined microphase-separated structure with good interconnectivity at the nanoscale was observed. This is responsible for the high ionic conductivity of the electrolyte together with the dimensional stability. A detailed structure–property relationship was investigated by changing the ratio of SBS to POEM, the concentration of each component, the chain length of POEM, and the operating temperature. Furthermore, solid-state flexible supercapacitors were fabricated using carbon-based electrodes on carbon paper substrates. The performance of supercapacitors based on the SBS-g-POEM electrolyte was much higher than that of the widely used conventional PVA/H3PO4 electrolyte.

Graphical abstract: An amphiphilic block–graft copolymer electrolyte: synthesis, nanostructure, and use in solid-state flexible supercapacitors

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Publication details

The article was received on 29 Jan 2016, accepted on 19 Apr 2016 and first published on 20 Apr 2016


Article type: Paper
DOI: 10.1039/C6TA00888G
J. Mater. Chem. A, 2016,4, 7848-7858

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    An amphiphilic block–graft copolymer electrolyte: synthesis, nanostructure, and use in solid-state flexible supercapacitors

    J. Y. Lim, J. K. Kim, J. M. Lee, D. Y. Ryu and J. H. Kim, J. Mater. Chem. A, 2016, 4, 7848
    DOI: 10.1039/C6TA00888G

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