Method for measuring granularity of lithium salt

By using a non-polar organic solvent as the dispersion medium in a low dew point drying environment, the problem of lithium salts being hygroscopic and soluble was solved, achieving high precision and repeatability in lithium salt particle size measurement and expanding the application of laser particle size analyzers.

CN122108870APending Publication Date: 2026-05-29SHANGHAI XUANYI NEW ENERGY DEV CO LTD
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Patent Information

Application Number
CN202610385054.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-26
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the existing technology, lithium salts such as lithium bromide are difficult to measure accurately due to their hygroscopic and soluble properties, which affects the performance of sulfide solid electrolyte materials.

Method used

In a dry environment with a dew point ≤ -45℃, non-polar organic solvents such as n-heptane, n-dodecane, and n-undecane are used as dispersion media, and a laser particle size analyzer is used to measure the particle size of lithium salt suspensions to prevent moisture absorption and dissolution, thus ensuring measurement accuracy.

Benefits of technology

It achieves accuracy and repeatability in lithium salt particle size measurement, with a relative standard deviation (RSD) of <2%, and is suitable for particle size measurement of highly hygroscopic lithium salts, expanding the application range of laser particle size analyzers and making them applicable to other easily soluble materials.

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Abstract

The invention discloses a lithium salt granularity measuring method, and belongs to the technical field of material measurement. The measurement method comprises the following steps: S1, obtaining lithium salt powder to be measured; s2, dispersing lithium salt powder in a dispersion medium under the condition that the dew point temperature of a measurement environment is less than or equal to-45 DEG C to form a lithium salt suspension; measuring the granularity of the lithium salt in the lithium salt suspension by using granularity measuring equipment to obtain the granularity of lithium salt powder; wherein the dispersion medium is selected from at least one of n-heptane, n-dodecane, n-undecane, n-decane, n-hexane, toluene, xylene, anisole and butyl butyrate. The lithium salt granularity measuring method provided by the invention is particularly suitable for measuring the granularity of a sample easy to absorb moisture or dissolve, the measuring precision is high, the repeatability is good, and the RSD is less than 2%.
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