电解质
化学
锂(药物)
分析化学(期刊)
气体成分
电极
色谱法
热力学
物理
医学
内分泌学
物理化学
作者
Jan-Patrick Schmiegel,Marco Leißing,Franz Weddeling,Fabian Horsthemke,Jakub Reiter,Quan Fan,Sascha Nowak,Martin Winter,Tobias Placke
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2020-01-04
卷期号:167 (6): 060516-060516
被引量:22
标识
DOI:10.1149/1945-7111/ab8409
摘要
Parasitic gas evolution in lithium ion battery (LIB) cells especially occurs within the first charge cycle, but can also take place during long-term cycling and storage, thereby, negatively affecting the cell performance. Gas formation is influenced by various factors, such as the cell chemistry and operating conditions, thus, demanding fundamental studies in terms of interphase and gas formation (gas volume and composition) and electrolyte consumption. Gas analyses in terms of mass spectrometry of gaseous products are regularly performed, however, usually using custom-made cell designs with a high excess of electrolyte. Here, a gas sampling port (GSP) is incorporated in a commercial small-scale multilayer pouch cell in a simple post-production process and systematically evaluated as proof-of-principle approach towards effective electrolyte additive research under practically relevant conditions, i.e., when applying a limited amount of electrolyte per cell capacity. The GSP-based LIB pouch cell design allows the voltage-dependent identification and separation of formed gases, while a clear correlation between electrolyte reduction peaks, observed in differential capacity profiles, and the onset of gas evolution is demonstrated. In summary, the novel GSP-based pouch cell setup benefits from the possibility of multiple time-, cell voltage- or state-of-charge-dependent gas measurements, without significantly influencing the original cell performance.
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