A kind of method for rapid determination of lithium salt species in lithium-ion battery electrolyte

A lithium-ion battery and rapid determination technology, which is applied in the direction of measuring devices, material separation, instruments, etc., can solve the problems of lithium salts that are not disclosed in the literature, and achieve the effect of fast and simple testing process and accurate and stable measurement results

Inactive Publication Date: 2011-12-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • A kind of method for rapid determination of lithium salt species in lithium-ion battery electrolyte
  • A kind of method for rapid determination of lithium salt species in lithium-ion battery electrolyte
  • A kind of method for rapid determination of lithium salt species in lithium-ion battery electrolyte

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Example Embodiment

[0015] Example 1:

[0016] Accurately weigh 0.100g LiPF 6 , 0.100g LiBF 4 , 0.100g LiClO 4 Dissolve them in deionized water respectively, and then make up the volume in 100ml volumetric flasks respectively to complete the preparation of the standard solution mother solutions of the three lithium salts.

[0017] Respectively measure a certain amount of lithium salt standard solution mother liquor, dilute to obtain the standard solution of 5-20mg / L, because the present invention aims to propose the method for measuring lithium salt species, thus, this example only selects the standard solution of 5mg / L to come. Determine the retention time of the standard lithium salt in the ion chromatogram, figure 1 The peaks of the three lithium salts in the ion chromatography are given. It can be seen that the ion chromatography can effectively separate LiPF 6 , LiBF 4 and LiClO 4 The three kinds of lithium salts are separated, so as to realize the method of rapid identification of lit...

Example Embodiment

[0018] Example 2:

[0019] Add accurately weighed 0.100g LiPF to 10ml EC / EMC / DEC (1:1:1, V / V) electrolyte solvent 6 , 0.100g LiBF 4 and 0.100g LiClO 4 Three kinds of lithium salts are prepared, and the electrolyte of lithium ion battery containing three kinds of lithium salts is prepared after thorough mixing. Take 5ml of the above electrolyte and dilute it with deionized water step by step. After each dilution, the obtained aqueous solution needs to stand for 10 minutes before starting the next dilution until the test sample with a content of about 10mg / L of each lithium salt is obtained. Select the same ion chromatography test conditions as in Example 1 to measure the standard lithium salt solution to test the retention time of the lithium salt anion in the sample to be tested. figure 2 The middle A spectrum is the peak of lithium salt anion in the sample to be tested. There are three peaks with retention times of 13.4 min, 16.5 min and 24.1 min in the spectrum, respecti...

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Abstract

The invention discloses a method for quickly determining the type of lithium salt in the electrolyte of a lithium ion battery, which mainly uses ion chromatography to measure LiPF6, LiBF4, LiClO4, LiBOB and other lithium salts with a concentration in the range of 5-100 mg/L standard solution, respectively to obtain the standard retention time of various lithium salt anion peaks; then add deionized water to the electrolyte sample to be tested and dilute until the lithium salt concentration is in the standard concentration range, and then use ion chromatography to determine the lithium salt standard solution The same test conditions test the peak retention time of the lithium salt anion, and compare the retention time with the standard retention time to determine the type of lithium salt in the electrolyte. The electrolytic solution of the present invention does not need pretreatment, and the test process is fast and simple, and the types of various lithium salts in the electrolytic solution can be determined simultaneously, and the measurement result is accurate and stable.

Description

technical field [0001] The invention relates to a method for quickly determining the type of lithium salt in the electrolyte solution of a lithium ion battery, and belongs to the technical field of chemical substance identification. Background technique: [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have extremely important applications in electronic products, electric vehicles, aerospace and other fields. Electrode materials, electrolytes, and separators are the key components of lithium-ion batteries, and their performance directly determines the capacity and safety of the battery. At present, the lithium-ion battery electrolyte is mainly composed of solvents and electrolyte lithium salts. The solvents are mostly high-purity organic solvents of carbonate series, such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), Diethyl carbonate (DEC), e...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 杨续来孙红梅刘成士周威艾顺徐小明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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