Scharf, Janik and von Lueders, Christian and Matysik, Frank-Michael and Misiewicz, Casimir and Wandt, Johannes and Berg, Erik J. (2024) Gas evolution in large-format automotive lithium-ion battery during formation: Effect of cell size and temperature. JOURNAL OF POWER SOURCES, 603: 234419. ISSN 0378-7753, 1873-2755
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Optimization of cell formation during lithium -ion battery (LIB) production is needed to reduce time and cost. Operando gas analysis can provide unique insights into the nature, extent, and duration of the formation process. Herein we present the development and application of an Online Electrochemical Mass Spectrometry (OEMS) design capable of monitoring gas evolution and consumption in both model coin -cells (Q = 0.72 mAh) with a graphite/electrolyte weight -ratio of 1:12.5 and large -format Li -ion cells (Q = 72 Ah) with a graphite/electrolyte weight -ratio of 1:0.63 during operation. Although the composition and amounts of gas are highly comparable, even when validated against ex -situ analysis, the gas release rate is lower from the larger cell size and likely limited by gas bubble transport through the electrode stack of the cell during formation. Higher temperatures accelerate the formation process, but also alters the composition and extent of gas released. Apart from providing novel insights into the formation processes of large -format Li -ion cells, our OEMS setup offers an opportunity for the battery manufacturing and automotive industry to explore the impact of battery formation and/or operating conditions on gas evolution in next -generation Li -ion batteries of any size.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SOLID-ELECTROLYTE INTERPHASE; ETHYLENE CARBONATE; VINYLENE CARBONATE; ALKYL CARBONATE; GRAPHITE ANODES; SEI; IDENTIFICATION; PROPYLENE; MECHANISM; METAL; Li-ion batteries; Automotive cells; Gas evolution; Online electrochemical mass spectrometry; Cell formation |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Instrumentelle Analytik (Prof. Frank-Michael Matysik) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Dec 2025 08:46 |
| Last Modified: | 04 Dec 2025 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64863 |
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