A high-voltage quasi-solid-state flexible supercapacitor with a wide operational temperature range based on a low-cost “water-in-salt” hydrogel electrolyte
Yongqi Deng, Hongfei Wang, Kefu Zhang, Jingwen Shao, Jun Qiu, Juan Wu, Yihan Wu, Lifeng Yan
Abstract
after 6000 cycles comparable to those supercapacitors using high-cost LiTFSI salts. Besides, the supercapacitor with excellent temperature stability in the range of -20 to 70 °C can light an LED for more than one minute. The assembled flexible device with the PAAK/CMC-24 M gel film sandwiched in between demonstrates excellent bendability from 0° to 180° and shows great potential for flexible/wearable electronic devices. Our feasible approach provides a new route for assembling quasi-solid-state flexible high-energy storage devices with "water-in-salt" electrolytes.
Topics & Concepts
SupercapacitorElectrolyteMaterials scienceElectrochemistryIonic conductivitySalt (chemistry)Solid-stateConductivityChemical engineeringElectrochemical windowPolyelectrolyteVoltageIonic bondingRange (aeronautics)Atmospheric temperature rangeElectrodeNanotechnologyIonComposite materialElectrical engineeringChemistryPolymerOrganic chemistryEngineeringPhysical chemistryMeteorologyPhysicsSupercapacitor Materials and FabricationAdvanced Battery Materials and TechnologiesAdvanced battery technologies research