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Lithium-ion Cell Safety Improve by Reduced Pressure

Hofmann, Andreas; Hanemann, Thomas

Electrolytes are one of the key components in lithium ion batteries because of their interaction with all materials inside the lithium cell. Usually, they consist of mixtures of organic carbonates as solvents, lithium containing conducting salts, and various additives. During a thermal runaway accident, the electrolyte is one of the most critical compounds due to its potential to form highly toxic and flammable decomposition products. A thermal runaway accident can arise due to various cell failures and usually happens in several steps. In dependence of the cause of the cell failure, different mechanisms led to a worst-case scenario in which the cell becomes un-controllable and a fire accident takes place, as can be observed in the current Li-ion safety problematic. In the process, various gases can be formed at elevated temperatures and will cause a cell bloat and in the end an ignition of the whole cell. During a thermal runaway, the initial “electrolyte burn” will ignite also high-energy electrode material and cause a more pronounced accident. Such a fire can release lots of toxic gaseous electrode metals (Ni, Co, Mn) and fluorine-rich compounds. ... mehr

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Volltext §
DOI: 10.5445/IR/1000065212
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Maschinenbau (MACH)
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Poster
Publikationsjahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-652124
KITopen-ID: 1000065212
HGF-Programm 37.01.11 (POF III, LK 01) Elektrochemistry, Theory and Modelling
Veranstaltung AABC Europe 2017, 30.01.-02.02.2017, Mainz
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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