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Detection method for chlorine ion content in lithium-ion battery electrolyte

A technology of chloride ion content and lithium ion battery, applied in the field of chemical analysis, can solve the problems of large method error, high detection limit, unsatisfactory repeatability and reproducibility, etc., and achieves simple and fast operation, low detection limit and low cost. Effect

Inactive Publication Date: 2013-04-24
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection limit of the method is high, and the sample with chlorine content <1000μg / kg cannot be accurately quantified, and the method error is large, the repeatability and reproducibility are not ideal, the color change of the end point is not obvious, and the applicability of the method is not strong

Method used

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  • Detection method for chlorine ion content in lithium-ion battery electrolyte
  • Detection method for chlorine ion content in lithium-ion battery electrolyte
  • Detection method for chlorine ion content in lithium-ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. Preparation of 0.1mol / L silver nitrate standard solution:

[0039] Weigh 17.5g of silver nitrate, dissolve in 1000mL of ethanol, and shake well. The solution is stored in a brown bottle.

[0040] B. Calibration with 0.1mol / L silver nitrate standard solution:

[0041] Weigh 0.22g of the reference reagent sodium chloride, and use a potentiometric titrator (the silver electrode is the indicator electrode, and the glass electrode is the reference electrode) for calibration.

[0042] D. Preparation of 0.001mol / L silver nitrate standard solution:

[0043] The prepared and calibrated 0.1mol / L silver nitrate standard solution was accurately diluted 100 times with ethanol.

[0044] E. Detection of chloride ions in the electrolyte:

[0045] Accurately weigh about 60g of lithium-ion battery electrolyte sample (accurate to 0.01g) into the titration cup, and after stirring, titrate the solution with standard silver nitrate with a concentration of 0.001mol / lL, and use Metrohm ...

Embodiment 2

[0059] With reference to the experimental procedure of Example 1, the solvent ethanol of the silver nitrate standard solution was replaced with acetone, and the other steps were the same.

[0060] Sample inspection results:

[0061]

[0062] Recovery test results:

[0063]

Embodiment 3

[0065] With reference to the experimental procedure of Example 1, the solvent ethanol of the silver nitrate standard solution was replaced with ethyl acetate, and the other steps were the same.

[0066] Sample inspection results:

[0067]

[0068] Recovery test results:

[0069]

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Abstract

The invention discloses a detection method for chlorine ion content in lithium-ion battery electrolyte. A non-aqueous potentiometric titration method is adopted for detection. Non-aqueous silver nitrate standard solution is taken as titrant; a silver electrode is an indicating electrode and a glass electrode is a reference electrode; a detected sample is titrated to an end point by the non-aqueous silver nitrate standard solution; and the chlorine ion content in the sample can be obtained by calculation according to the size of the detected sample, the concentration of the silver nitrate standard solution and the titration volume. The method has the advantages of simplicity and rapidness in operation, low cost, low detection limit and high result precision.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a method for detecting chloride ion content in lithium-ion battery electrolyte. Background technique [0002] Electrolyte is an important part of lithium-ion batteries. Chloride ions in battery materials have a corrosive effect on the positive and negative electrode materials of the battery, resulting in a decrease in battery capacity, and serious perforation of the pole piece, destroying the entire battery. In the industry standard "HG / T4067-2008 Lithium Hexafluorophosphate and Lithium Hexafluorophosphate Electrolyte requires its content to be ≤1000μg / kg. [0003] The raw materials of the electrolyte are mainly composed of carbonate and carboxylate organic solvents, lithium salts, and additives. The lithium salt is mainly lithium hexafluorophosphate, which uses lithium chloride as a raw material in the synthesis process. Chloride ions are mainly introduced from the raw materia...

Claims

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Application Information

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IPC IPC(8): G01N27/42
Inventor 廖红伟孙伏恩杨宁江
Owner GUANGZHOU TINCI MATERIALS TECH
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