Analysis on Extraction Behaviour of Lithium-ion Battery Electrolyte Solvents in Supercritical CO2 by Gas Chromatography

The extraction behavior of Lithium-ion battery electrolyte components has been investigated in diverse parameters for supercritical CO2. The components, containing ethylene carbonate, dimethyl carbonate and ethylmethyl carbonate that are commonly used in lithium ion battery electrolyte, have been quantitated by gas chromatography with flame ionization detector based on internal standard calibration. The extraction behavior, yield and order of extract components have shown the difference caused by the varied physical properties under selected extraction parameters-extraction pressure (15 to 35 MPa), temperature (30 to 50 degrees C) and time (25 to 65 min). In addition, the polarity and the melting point of carbonate has a strong influence on composition during the trapping process.