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Clarification of Decomposition Pathways in a State‐of‐the‐Art Lithium Ion Battery Electrolyte through 13 C‐Labeling of Electrolyte Components
Author(s) -
Henschel Jonas,
Peschel Christoph,
Klein Sven,
Horsthemke Fabian,
Winter Martin,
Nowak Sascha
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000727
Subject(s) - ethylene carbonate , electrolyte , chemistry , thermal decomposition , electrochemistry , decomposition , chemical decomposition , dissociation (chemistry) , battery (electricity) , inorganic chemistry , lithium (medication) , lithium ion battery , carbonate , dimethyl carbonate , methanol , organic chemistry , electrode , medicine , power (physics) , physics , quantum mechanics , endocrinology
The decomposition of state‐of‐the‐art lithium ion battery (LIB) electrolytes leads to a highly complex mixture during battery cell operation. Furthermore, thermal strain by e.g., fast charging can initiate the degradation and generate various compounds. The correlation of electrolyte decomposition products and LIB performance fading over life‐time is mainly unknown. The thermal and electrochemical degradation in electrolytes comprising 1 m LiPF 6 dissolved in 13 C 3 ‐labeled ethylene carbonate (EC) and unlabeled diethyl carbonate is investigated and the corresponding reaction pathways are postulated. Furthermore, a fragmentation mechanism assumption for oligomeric compounds is depicted. Soluble decomposition products classes are examined and evaluated with liquid chromatography‐high resolution mass spectrometry. This study proposes a formation scheme for oligo phosphates as well as contradictory findings regarding phosphate‐carbonates, disproving monoglycolate methyl/ethyl carbonate as the central reactive species.