Inorganic electrolyte lithium salt content detection method

Abstract

The invention provides an inorganic electrolyte lithium salt content detection method. The method comprises the following steps: a to-be-measured sample solution containing inorganic electrolyte lithium salt is subjected to constant-temperature standing, conductivity is tested, and according to a conductivity curve of an inorganic electrolyte lithium salt standard solution, the content of the inorganic electrolyte lithium salt in the to-be-measured sample solution can be obtained. Compared with the prior art, by using different concentrations of the inorganic electrolyte lithium salts in an organic solvent system and corresponding relation with conductivity in the solution system, so that concentration of the inorganic electrolyte lithium salt in the solution can be rapidly detected, the method has the advantages of simple operation and low detection cost, detection can be completed only in 3-5 min, quality control requirement during production can be completely satisfied, and the detection result has good repeatability.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for detecting the lithium salt content of an inorganic electrolyte. Background technique [0002] Electrolyte plays a very important role in lithium battery materials, known as "the blood of lithium ion batteries". As the electrolyte salt of secondary batteries, the main components are inorganic lithium salts and organic lithium salts, of which inorganic lithium salts include lithium perchlorate, lithium tetrafluoroborate, lithium hexafluoroarsenate and lithium hexafluorophosphate, and organic lithium salts currently include chelated boron class such as LiB(C 2 o 4 ) 3 , chelated phosphorus such as LiP(C 6 h 4 o 2 ) 3 , perfluorophosphine such as Li(RfPF 5 ), alkyl LiC(CF 3 SO 2 ) 3 , lithium imide LiN(CF 3 SO 2 ) 2 and other products. [0003] Lithium hexafluorophosphate is currently the most important electrolyte lithium salt use...

AI Technical Summary

Problems solved by technology

[0004] At present, the detection of lithium hexafluorophosphate adopts the national standard or the industry standard method in both the production process and the factory inspection. Although this type of detection method has high precision, the detection cycle is too long and the cost is too high. It is enough to guide the synthesis production process to achieve an accuracy of 1 percentage point. , so it is not suitable for the rapid judgment of the content in the process and the needs of production guidance

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