In-operando GC-MS: A new tool for the understanding of degradation processes occurring in electrochemical capacitors

卷:56

Article

关键词: QUARTZ-CRYSTAL MICROBALANCE;    SITU X-RAY;    CHARGE-STORAGE MECHANISMS;    ATOMIC-FORCE MICROSCOPE;    DOUBLE-LAYER;    ION DYNAMICS;    INTERPHASE FORMATION;    PRESSURE EVOLUTION;    HEAT-GENERATION;    ENERGY-STORAGE;   

DOI  :  10.1016/j.ensm.2023.01.014

来源: SCIE

【 摘 要 】

In this work, we present an innovative design of an electrochemical three-electrode cell for in-operando gas chromatography-mass spectrometry analysis, which allows performing electrochemical measurements while probing and analyzing the liquid electrolyte in real-time. The presented cell shows similar electrochemical performance to commonly used lab-scale cells and can be utilized for the investigation of any kind of electro-chemical system. The three-electrode configuration enables the differentiation of processes occurring at the respective positive or negative electrode. Investigating the aging of electrochemical cells, it is possible to obtain a detailed time-resolved insight into occurring decomposition processes. As a model case, we investigated aging processes occurring in an electric double-layer capacitor containing a one-molar solution of tetraethylammonium tetrafluoroborate in acetonitrile. Showing a time-and voltage-dependent evolution, decomposition products of the salt, solvent, and electrode were detected and assigned to aging processes occurring at the respective positive and/or negative electrode-electrolyte interphase. Used for the detection of soluble decomposition species within the electrolyte, in-operando gas chromatography-mass spectrometry is uniquely suited to be combined with techniques focused on the electrode and/or gas phase of electrochemical energy storage devices.

【 授权许可】

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