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Mass Spectrometry Analysis of NMC622/Graphite Li-Ion Cells Electrolyte Degradation Products after Storage and Cycling

Abstract : With the aim of establishing a data simultaneous comparison, the Principal Component Analysis (PCA) statistical tool was applied to LiNi0.6Mn0.2Co0.2O2/graphite Li-ion cells electrolyte's decomposition products detected by UHPLC-ESI-HRMS. Herein, we illustrate how the chemometric tool associated with mass spectrometry data can be relevant to provide information about the presence of unusual molecules. Indeed, pristine Triton X-100 surfactant molecules used in the electrode elaboration process were detected after the impregnation stage. However, as they chemically react and oxidize at a potential lower than 4.5 V vs Li/Li+, only surfactant derivatives and classical ageing molecules were observed, respectively, after storage and cycling stages at 55 degrees C, leading to a triangle-type correlation circle. On the other hand, global schemes of LiPF6-based electrolyte degradation pathways were elaborated from a comparative study with literature to help interpret results in future electrolyte ageing studies.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03611366
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Soumis le : jeudi 17 mars 2022 - 10:12:19
Dernière modification le : mercredi 23 mars 2022 - 03:47:22

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Sebastien Rigaud, Ana Cristina Martinez, Tristan Lombard, Sylvie Grugeon, Pierre Tran-Van, et al.. Mass Spectrometry Analysis of NMC622/Graphite Li-Ion Cells Electrolyte Degradation Products after Storage and Cycling. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2022, 169 (1), ⟨10.1149/1945-7111/ac44bb⟩. ⟨hal-03611366⟩

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