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Gas Evolution in Operating Lithium-Ion Batteries Studied in Situ by Neutron Imaging

Michalak, B. 1,2; Sommer, H. 1,2; Mannes, D.; Kaestner, A.; Brezesinski, T. ORCID iD icon 1,2; Janek, J. 1,2
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Center for Electrochemical Energy Storage Ulm & Karlsruhe (CELEST), Karlsruher Institut für Technologie (KIT)


Gas generation as a result of electrolyte decomposition is one of the major issues of highperformance rechargeable batteries. Here, we report the direct observation of gassing in operating lithium-ion batteries using neutron imaging. This technique can be used to obtain qualitative as well as quantitative information by applying a new analysis approach. Special emphasis is placed on high voltage LiNi0.5Mn1.5O4/graphite pouch cells. Continuous gassing due to oxidation and reduction of electrolyte solvents is observed. To separate gas evolution reactions occurring on the anode from those associated with the cathode interface and to gain more insight into the gassing behavior of LiNi0.5Mn1.5O4/graphite cells, neutron experiments were also conducted systematically on other cathode/anode combinations, including LiFePO4/graphite, LiNi0.5Mn1.5O4/Li4Ti5O12 and LiFePO4/Li4Ti5O12. In addition, the data were supported by gas pressure measurements. The results suggest that metal dissolution in the electrolyte and decomposition products resulting from the high potentials adversely affect the gas generation, particularly in the first charge cycle (i.e., during graphite solid-electrolyte interface layer formation).

Volltext §
DOI: 10.5445/IR/1000050796
DOI: 10.1038/srep15627
Zitationen: 96
Web of Science
Zitationen: 90
Zitationen: 98
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000050796
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Scientific Reports
Verlag Nature Research
Band 5
Seiten 15627
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Web of Science
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