Detection method of sulfate ion in electrolyte used for lithium ion battery

A sulfate ion and lithium ion battery technology, applied in the field of electrochemistry, can solve the problems of inapplicability, and achieve the effect of realizing measurement and convenient observation and comparison

Active Publication Date: 2016-10-05
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Since the electrolyte solution for lithium-ion batteries is an organic mixture, it is insoluble in water, and the usual sulfate radical turbidimetric method is measured in the water phase, so the currently used turbidimetric method is not applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with specific embodiment:

[0025] 1. Instruments and reagents are shown in Table 1:

[0026] Table 1

[0027]

name

Specification

1

Stoppered colorimetric tube

50mL

[0028] 2

Electronic balance

Division value 0.0001g

3

Anhydrous Sodium Sulfate

Analytical pure

4

Barium Chloride Dihydrate

Analytical pure

5

hydrochloric acid

Analytical pure

6

Absolute ethanol

Analytical pure

7

distilled water

Comply with GB-6682 three-level water specification

[0029] 2. Determination method:

[0030] 1. Prepare ethanol aqueous solution (m 乙醇 :m 水 =1︰2): Weigh 300g of absolute ethanol and 600g of distilled water, mix well, and set aside.

[0031] 2. Prepare 0.5 mol / L barium chloride aqueous solution (pH=1): Weigh 122g barium chloride dihydrate and 9.8g concentrated hydrochloric acid, ...

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PUM

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Abstract

The invention relates to a detection method of sulfate ion in an electrolyte used for a lithium ion battery. The method includes the steps of: preparing an organic solvent water solution; preparing a sulfate water solution; preparing a plurality of sulfate ion standard substances; preparing a sample; and calculating the content range of the sulfate ions in the electrolyte. According to the rule of similarity and dissolving, the organic solvent water solution is prepared from an organic solvent and water according to certain ratio, so that the polarity of the organic solvent water solution is similar to that of the electrolyte, and the electrolyte is soluble in the organic solvent water solution. In addition, through addition of an acidic barium chloride water solution, the barium ions form barium sulfate precipitate only with the sulfate ions, so that the method allows convenient observation and comparison, thereby achieving the detection of content of the sulfate ion in the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for determining sulfate ions in an electrolyte solution for a lithium ion battery. Background technique [0002] Sulfate ion (SO 4 2- ) Determination usually has ion chromatography and turbidimetry, but for lithium-ion battery electrolyte, due to SO 4 2- Relative to the content of electrolyte salt is very small (electrolyte salt / SO 4 2- Usually 10 7 ,10 8 times), direct injection, seriously exceeding the capacity of the chromatographic column; dilution injection, often lower than SO 4 2- The lower limit of detection, so ion chromatography is not very suitable. Since the electrolyte solution for lithium-ion batteries is an organic mixture, it is insoluble in water, and the usual sulfate radical turbidimetric method is measured in the water phase, so the currently used turbidimetric method is not applicable. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/82
Inventor 刘云生刘敏田青松卢琼洁陶勤艳宋娟许芬
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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