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MM: Fachverband Metall- und Materialphysik

MM 46: Materials for Energy Storage and Conversion - Electronic Properties

MM 46.2: Vortrag

Mittwoch, 18. März 2020, 17:30–17:45, IFW D

An ultrafast graphite oxide-graphite capacitor enabled by potassium-based ether electrolyte — •Chenglin Zhang, Long Liu, Yuhan Wu, and Yong Lei — Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany

Graphite oxide-graphite hybrid capacitor which can offer energy between batteries and supercapacitors while in principle offering supercapacitor-like power and cyclability values was proposed as a supplementary to batteries. This prototype not only explores cheaper potassium to replace lithium to reduce costs but also employ mature commercial graphite as the negative electrode and its derivative as the positive electrode to further reduce costs and improve the prospect of commercialization. The potassium-based ether electrolyte was demonstrated that can perfectly comply with both fast ion adsorption on the graphite oxide cathode and co-intercalation in graphite anode. The extremely low-cost carbonaceous capacitor exhibited outstanding performance with large capacity, high rate capability, and long cyclability. Considering the cost-effectiveness, material sustainability, this new model may shed some light on searching for future energy storage devices.