Clarification of Decomposition Pathways in a State-of-the-Art Lithium Ion Battery Electrolyte through 13 C-Labeling of Electrolyte Components.
Jonas HenschelChristoph PeschelSven KleinFabian HorsthemkeMartin WinterSascha NowakPublished in: Angewandte Chemie (International ed. in English) (2020)
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 LiPF6 dissolved in 13 C3 -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.
Keyphrases
- solid state
- high resolution mass spectrometry
- liquid chromatography
- ionic liquid
- mass spectrometry
- ion batteries
- ultra high performance liquid chromatography
- gas chromatography
- gold nanoparticles
- simultaneous determination
- single cell
- cell therapy
- pet imaging
- computed tomography
- atomic force microscopy
- solid phase extraction
- mesenchymal stem cells
- molecularly imprinted