Oxidative electrolyte solvent degradation in lithium-ion batteries. An in situ differential electrochemical mass spectrometry investigation
- Paul Scherrer Inst., Villigen PSI (Switzerland). Electrochemistry Section
Differential electrochemical mass spectrometry (DEMS) was used to study the electrochemical decomposition of organic carbonate electrolyte solutions at practical lithium metal oxide composite electrodes used in lithium-ion batteries. For propylene carbonate (PC), CO{sub 2} evolution was detected at LiNiO{sub 2}, LiCoO{sub 2}, and LiMn{sub 2}O{sub 4} composite electrodes. The starting point of gas evolution was 4.2 V vs. Li/Li{sup +} at LiNiO{sub 2}, whereas at LiCoO{sub 2} and LiMn{sub 2}O{sub 4}, CO{sub 2} evolution was observed only above 4.8 V vs. Li/Li{sup +}. In addition, various other volatile electrolyte decomposition products of PC were detected when using LiCoO{sub 2}, LiMn{sub 2}O{sub 4}, and carbon black electrodes. In ethylene carbonate/dimethylcarbonate, CO{sub 2} evolution was detected only at LiNiO{sub 2} electrodes, again starting at about 4.2 V vs. Li/Li{sup +}.
- OSTI ID:
- 354413
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 146; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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