Please use this identifier to cite or link to this item: doi:10.22028/D291-29119
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Title: Asymmetric tin–vanadium redox electrolyte for hybrid energy storage with nanoporous carbon electrodes
Author(s): Lee, Juhan
Tolosa, Aura
Krüner, Benjamin
Jäckel, Nicolas
Fleischmann, Simon
Zeiger, Marco
Kim, Daekyu
Presser, Volker
Language: English
Title: Sustainable Energy & Fuels
Volume: 1
Issue: 2
Startpage: 299
Endpage: 307
Publisher/Platform: Royal Society of Chemistry (RSC)
Year of Publication: 2017
Publikation type: Journal Article
Abstract: In recent decades, redox-active electrolytes have been applied in stationary energy storage systems, benefitting from Faradaic reactions of the electrolyte instead of the electrode material. One of the challenging tasks is to balance the redox activities between the negative and positive electrode. As a possible solution, a mixed electrolyte with vanadyl and tin sulfate was previously suggested; however, a low power performance is a great challenge to be overcome. Here, we found that the origin of the poor power performance in the mixture electrolyte system (vanadium complex and tin solution) is the reduction of the pore volume at the positive electrode via irreversible tin dioxide formation. To prevent the latter, we introduce a hybrid energy storage system exhibiting both battery-like and supercapacitor-like features via asymmetric redox electrolytes at the microporous activated carbon electrodes; SnF2 solution as anolyte and VOSO4 as catholyte. By employing an anion exchange membrane, the irreversible SnO2 formation at the positive electrode is effectively suppressed; thus, an asymmetric 1 M SnF2|3 M VOSO4 system provides a high maximum specific power (3.8 kW kg−1 or 1.5 kW L−1), while still exhibiting a high maximum specific energy up to 58.4 W h kg−1 (23.4 W h L−1) and a high cycling stability over 6500 cycles.
DOI of the first publication: 10.1039/C6SE00062B
Link to this record: hdl:20.500.11880/28048
http://dx.doi.org/10.22028/D291-29119
ISSN: 2398-4902
Date of registration: 10-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:UniBib – Die Universitätsbibliographie

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