Method for determining residual solvent in solid electrolyte lithium salt

• Main Authors: KONG ZHIMEI, TENG SHA, ZHANG LIYA, XIA QIUXIA, CAO XIUKUN, ZHAO YAJUAN
• Format: Patent
• Language: Chinese; English
• Published: 27.11.2020
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for determining a residual solvent in a solid electrolyte lithium salt. The method comprises the following steps of: taking a certain amount of chromatographic grade solvent, and accurately quantifying the chromatographic grade solvent by using an ester organic solvent to prepare a standard solution with the mass concentration of 50-500 ppm of the chromatographic grade solvent; taking a certain amount of the electrolyte lithium salt as a to-be-detected sample, and diluting the to-be-detected sample into a to-be-detected sample solution with a certain concentration by using the ester organic solvent; respectively loading the standard solution and the to-be-detected sample solution, carrying out gas chromatography determination, and recording the corresponding peak area and retention time of the chromatographic grade solvent and the peak area and retention time of a residual solvent in a gas chromatogram; and calculating the content of the residual solvent in the to-be-detected