Pretreatment method and detection method for detecting electrolyte organic solvent
A technology of organic solvents and detection methods, applied in the field of analytical chemistry, can solve the problems of reduced stability and accuracy of test results, damage to the stability of gas chromatographic column packing, and increased corrosion of gas chromatographs, so as to avoid quantification and stability Interference, reduced test costs, and easy operation
Active Publication Date: 2020-06-09
GUANGZHOU TINCI MATERIALS TECH +1
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Problems solved by technology
[0004]
There are related reports that electrolytes will produce more corrosive substances such as phosphorus oxyfluoride, phosphorus fluoride, and hydrofluoric acid during storage or high temperature processes, and these substances have a greater impact on the packing stability of gas chromatography columns. The destructive effect of the chromatographic column leads to more column loss during the test process. On the one hand, the stability and accuracy of the test results are reduced, and on the other hand, the life of the chromatographic column is seriously shortened; with the increase of test frequency, hydrofluoric acid The corrosive gas also increases the corrosion of the gas chromatograph, which affects the accuracy of the instrument and increases the failure rate of the equipment
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Embodiment 1
[0076] Instruments and experimental medicines: pipettes, ion-exchange solid-phase extraction columns (DIKMA ProElut SAX), beakers, volumetric flasks, PET bottles, ethyl methyl carbonate solvent: content ≥ 99.99%, electrolyte (containing organic solvents : Dimethyl carbonate, diethyl carbonate, propylene carbonate, ethylene carbonate, ethyl propionate, vinylene carbonate, fluorobenzene, fluoroethylene carbonate, adiponitrile, succinonitrile, 1,3- propane sultone, 1,3,6-hexanetrinitrile).
[0077] (1) Sample pretreatment
[0078] Cartridge activation: Activate the SAX solid phase extraction column with ethyl methyl carbonate, and use a small beaker to collect the filtrate at the lower end of the cartridge, to be discarded.
[0079] Pass through the column: use a pipette to accurately pipette 1mL of electrolyte solution onto the small column, and collect the filtrate.
[0080] Elution: Then add ethyl methyl carbonate along the wall of the column tube for washing, wash 4-5 times...
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The invention relates to a pretreatment method for detecting an electrolyte organic solvent and a detection method. The pretreatment method comprises the following steps: taking an organic solvent which is different from an organic solvent contained in an electrolyte; activating an ion exchange type solid-phase extraction column by adopting the organic solvent; loading the electrolyte, performingcolumn chromatography, and collecting filtrate; and eluting with the organic solvent, collecting the filtrate, and combining the filtrate collected in the two times to obtain electrolyte to be detected. According to the pretreatment method, lithium salt in the electrolyte organic solvent can be fully removed; more importantly, corrosive substances in the electrolyte can be prevented from enteringdetection equipment and corroding instruments, the column loss is reduced, the service life of a chromatographic column is prolonged, the test cost is reduced, meanwhile, the test accuracy is improved, and the method can be used for detecting production, research and development products.
Description
technical field [0001] The invention relates to the field of analytical chemistry, in particular to a pretreatment method and a detection method for detection of organic solvents in electrolytes. Background technique [0002] Lithium-ion battery is a green, high-energy and environment-friendly battery that appeared in the 1990s. It has been widely used in portable electronic products, power tools, electric bicycles and other fields. Among them, the organic electrolyte is an important part of the lithium-ion battery. It is responsible for the transmission of charges between the positive and negative electrodes in the battery. Therefore, the accuracy of the impurity type and content of the electrolyte directly affects the usability and safety of the battery. sex. [0003] Organic electrolyte is an important part of lithium-ion batteries. It plays the role of transferring charge between the positive and negative electrodes in the battery, and has an important impact on the mai...
Claims
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Login to View More IPC IPC(8): G01N30/02G01N30/08G01N30/14G01N30/54
CPCG01N30/02G01N30/08G01N30/14G01N30/54
Inventor 罗海英陈磊聂如杏信勇肖秀娟
Owner GUANGZHOU TINCI MATERIALS TECH