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High Flashpoint and Eco-Friendly Electrolyte Solvent for Lithium-Ion Batteries

Ströbel, Marco; Kiefer, Larissa; Pross-Brakhage, Julia; Hemmerling, Jessica; Finster, Philipp ORCID iD icon 1; Ziebert, Carlos ORCID iD icon 1; Birke, Kai Peter
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)

Abstract:

Since Sony launched the commercial lithium-ion cell in 1991, the composition of the liquid electrolytes has changed only slightly. The electrolyte consists of highly flammable solvents and thus poses a safety risk. Solid-state ion conductors, classified as non-combustible and safe, are being researched worldwide. However, they still have a long way to go before being available for commercial cells. As an alternative, this study presents glyceryl tributyrate (GTB) as a flame retardant and eco-friendly solvent for liquid electrolytes for lithium-ion cells. The remarkably high flashpoint (𝑇$_{FP}$=174 °C) and the boiling point (𝑇$_{BP}$=287 °C) of GTB are approximately 150 K higher than that of conventional linear carbonate components, such as ethyl methyl carbonate (EMC) or diethyl carbonate (DEC). The melting point (𝑇$_{MP}$=−75 °C) is more than 100 K lower than that of ethylene carbonate (EC). A life cycle test of graphite/NCM with 1 M LiTFSI dissolved in GTB:EC (85:15 wt) achieved a Coulombic efficiency of above 99.6% and the remaining capacity resulted in 97% after 50 cycles (𝐶/4) of testing. The flashpoint of the created electrolyte is 𝑇$_{FP}$=172 °C and, therefore, more than 130 K higher than that of state-of-the-art liquid electrolytes. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000161665
Veröffentlicht am 24.08.2023
Originalveröffentlichung
DOI: 10.3390/batteries9070348
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2023
Sprache Englisch
Identifikator ISSN: 2313-0105
KITopen-ID: 1000161665
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in Batteries
Verlag MDPI
Band 9
Heft 7
Seiten Art.-Nr.: 348
Vorab online veröffentlicht am 28.06.2023
Schlagwörter improved thermal stability of electrolytes, eco-friendly electrolyte for lithium-ion batteries, enhanced electrolyte safety based on high flashpoint, glyceryl tributyrate, tributyrin
Nachgewiesen in Web of Science
Dimensions
Scopus
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