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Extreme properties of double networked ionogel electrolytes for flexible and durable energy storage devices

journal contribution
posted on 01.05.2019, 00:00 authored by H H Rana, J H Park, E Ducrot, H Park, M Kota, T H Han, J Y Lee, J Kim, J H Kim, Patrick HowlettPatrick Howlett, Maria ForsythMaria Forsyth, D MacFarlane, H S Park
Achieving both performances and functionalities of energy storage devices at extreme conditions remains a critical challenge due to the property trade-offs of materials. Here, we demonstrate highly ion-conducting, stretchable, and ultradurable double network (DN) ionogel films, where ionic liquids are confined in chemically-coupled DNs consisting of hard and soft polymers, for high-temperature flexible supercapacitors (hfSCs). Both mechanical and electrochemical integrities at high temperatures are attributed to the unique DN structure and thermally activated ionic transport of the ionogels. Even at 100 °C, the DN ionogel film demonstrates remarkable properties, such as the ionic conductivity of 36.8 mS cm −1 , the tensile strength of 1.4 MPa, stretchability of 500%, and dissipation energy of 216 kJ m −3 . Thus, the hfSCs achieve the highest energy density of 51.0 Wh kg −1 at 180 °C among previous solid-state SCs, showing extreme durability of 91% over 100,000 cycles and functional hybrid system at both elevated temperatures and bent states.

History

Journal

Energy storage materials

Volume

19

Pagination

197 - 205

Publisher

Elsevier

Location

Amsterdam, The Netherlands

eISSN

2405-8297

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, Elsevier B.V.