Method for testing concentration content of lithium hexafluorophosphate in lithium ion functional electrolyte by using ICP

Abstract

The invention relates to the technical field of electrolyte component determination, in particular to a method for detecting the concentration content of lithium hexafluorophosphate in an electrolyteby using ICP. The method comprises the following steps: taking 100mL of 37% concentrated hydrochloric acid, and adding 100mL of deionized water to dilute for later use to prepare a hydrochloric acid solution; accurately taking 20mL of a solvent to be detected into a 125mL separating funnel by adopting a pipette or a pipette gun; adding 30 mL of a hydrochloric acid solution, oscillating, standing for 10 min to obtain a water phase, namely a lithium salt solution obtained by extraction, carrying out back extraction on the organic phase twice by using hydrochloric acid, mixing and collecting thewater phase lithium salt solution obtained by three times of extraction, and meanwhile, fixing the volume to 100 mL by using deionized water to obtain an electrolyte to be detected; performing plasmaemission spectrum analysis on the to-be-detected electrolyte by using a plasma emission spectrum analyzer to obtain absorbance values A of the to-be-detected electrolyte, solving the lithium salt concentration C0 of the diluted to-be-detected electrolyte according to the absorbance values A and the standard curve, and calculating the lithium salt concentration C of the to-be-detected electrolyte according to a formula. The method is simple to operate, and the efficiency and precision are improved.

Description

technical field [0001] The invention relates to the technical field of electrolyte component measurement, in particular to a method for testing the concentration of lithium hexafluorophosphate in a lithium-ion functional electrolyte by using ICP. Background technique [0002] With the increasing demand for energy saving and environmental protection in recent years, the application of lithium batteries has become more and more extensive, and the appropriate method of using ICP to test the concentration of lithium hexafluorophosphate in the lithium-ion functional electrolyte is used to monitor the production process of the electrolyte. , to ensure the accuracy of the lithium salt concentration is very important for the monitoring process of the electrolyte production; the most important electrolyte in the lithium ion battery electrolyte is lithium hexafluorophosphate, the concentration of lithium hexafluorophosphate directly affects the conductivity of the electrolyte, and as t...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method of using ICP to test the concentration of lithium hexafluorophosphate in the lithium-ion functional electrolyte, which can be popularized and used in the laboratory, with convenient and simple operation, high accuracy, simple operation, and easy promotion, etc. Advantages, solve the above problems

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