Zugehörige Institution(en) am KIT | Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1) |
Publikationstyp | Forschungsdaten |
Publikationsdatum | 15.01.2024 |
Erstellungsdatum | 18.12.2023 |
Identifikator | DOI: 10.35097/1857 KITopen-ID: 1000165727 |
Lizenz | Creative Commons Namensnennung – Weitergabe unter gleichen Bedingungen 4.0 International |
Schlagwörter | Separator degradation, Online electrochemical mass spectrometry, Gas analysis, Electrolyte decomposition, Battery safety |
Liesmich | Material and Equipment: A high-temperature test cell (HTT Cell, PAT series test cell type, EL-Cell GmbH) was used for all experiments. Electrodes were purchased from CustomCells Itzehoe GmbH. The negative electrode has an area capacity of 2.2 mAh cm-2 with the following loading: 96 wt% SMG104 graphite active material, 2607SMG104. The capacity of the active material is 350 mAh g-1. It contained further styrene-butadiene-rubber/carboxymethyl cellulose (SBR/CMC) and conductive additives, all applied on copper foil; the positive electrode has an area capacity of 2.0 mAh cm-2, with the following loading: 93.5 wt% NMC 622 active material, K-771, capacity of the active material is 160 mAh g-1. It further contained polyvinylidene fluoride and conductive additives, all applied on aluminum foil. EC:DMC electrolyte (1:1 / v:v,1 M LiPF6, battery grade, Sigma Aldrich) was used. All electrodes were punched out to receive sheets with a uniform diameter of 18 mm. Their weight was measured (XS205, Mettler Toledo), and they were dried overnight at 120 °C under high vacuum before being transferred into an Ar glovebox (water and oxygen content under 0.1 ppm). All capacities were calculated based on the measured weight of the assembled electrodes. Setup for Temperature-induced Stress Test and Electrochemical characterization: The operando electrochemical and gas analysis setup couples a potentiostat and mass spectrometer. The HTT cell (EL-Cell) connects the lithium-ion battery with quick connectors with a heated transfer line and the mass spectrometer (MS, Omnistar GSD 320, Pfeiffer Vacuum). The parameters of the mass spectrometer are: Parameter Value The heating profile of the HTT cell during temperature-induced stress test are: Parameter Value All assembled cells were cycled with a Gamry potentiostat (5000 E) in a self-built temperature chamber at 25 °C in the voltage range between 3.0 V and 4.2 V. The cycling procedure was identical for all experiments is as follows: Parameter Value For more information about experimental details, see in the Experimental Section in the manuscript and the Supporting Information. |
Art der Forschungsdaten | Dataset |
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