Please use this identifier to cite or link to this item: doi:10.22028/D291-30358
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Title: Comparison of organic electrolytes at various temperatures for 2.8 V–Li-ion hybrid supercapacitors
Author(s): Shim, Hwirim
Budak, Öznil
Haug, Veronika
Widmaier, Mathias
Presser, Volker
Language: English
Title: Electrochimica acta : the journal of the International Society of Electrochemistry
Volume: 337
Startpage: 135760
Publisher/Platform: Elsevier Science
Year of Publication: 2020
Publikation type: Journal Article
Abstract: We explore different electrolytes containing lithium perchlorate (LiClO4) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salts in various solvents at different temperatures to associate the electrochemical stability of lithium titanium oxide (LTO)/lithium manganese oxide (LMO)-activated carbon (AC) composite Li-ion hybrid supercapacitors. By varying the solvents and operation temperature, we were able to detect a correlation between the electrochemical performance and the conductivity of each electrolyte. To test the electrochemical stability and longevity of the electrolytes in such a system, full-cells were analyzed via a voltage floating for 10 h at charged state (2.8 V) of the full-cell. Energy and power performance were the highest for acetonitrile (ACN) containing electrolytes due to their high lithium-ion conductivity. Additionally, the longevity of LiClO4 in 3-methoxypropionitrile (3-MPN) was superior to all tested electrolytes at ambient temperature with 97% capacity retention and energy efficiency of about 86% after 500 h of voltage floating. LiClO4 in a mixture of ACN and ethylene carbonate (EC) was the most stable electrolyte at high temperatures with 70% capacity retention after 500 h voltage floating at 60°C and 50% capacity retention after 250 h voltage floating. The longevity of LiTFSI in ACN and LiClO4 in 3-MPN electrolyte demonstrated a capacity retention of 97% and 92% after 500 h voltage floating, respectively, at low temperature (−10 °C).
DOI of the first publication: 10.1016/j.electacta.2020.135760
URL of the first publication: https://www.sciencedirect.com/science/article/pii/S0013468620301523#!
Link to this record: hdl:20.500.11880/28789
http://dx.doi.org/10.22028/D291-30358
ISSN: 1873-3859
0013-4686
Date of registration: 26-Feb-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:UniBib – Die Universitätsbibliographie

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