Method for carrying out chromatographic test pretreatment on lithium battery electrolyte

An electrolyte and lithium battery technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as interference and large loss of chromatographic column, and achieve the effects of fast speed, simple pretreatment process and less time consumption

Active Publication Date: 2016-11-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pretreatment method for lithium-ion battery electrolyte chromatographic testing in order to solve the problems of severe interference and large loss of chromatographic columns in the detection and analysis of the existing lithium-ion battery electrolyte

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  • Method for carrying out chromatographic test pretreatment on lithium battery electrolyte

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Embodiment 1

[0024] A method for pretreatment of lithium battery electrolyte chromatography test, the steps are as follows:

[0025] (1) Prepare a sodium carbonate solution with a purity of 99.9% into a saturated aqueous sodium carbonate solution;

[0026] (2) Take the saturated sodium carbonate aqueous solution in a centrifuge tube, then add the electrolyte sample and vortex for 5 minutes, wherein the volume ratio of the saturated sodium carbonate aqueous solution to the electrolyte sample is 2:1;

[0027] (3) Add the organic solvent ethyl acetate according to the volume ratio of the organic solvent and the electrolyte at 1:2, continue to vortex for 10 minutes, then let it stand for at least 10 minutes, and after it is completely separated, take out the upper liquid and put it in a glass sample bottle;

[0028] (4) Repeat the above step (3) twice;

[0029] (5) Blow the glass sample bottle with nitrogen at a low temperature of 15°C, remove the organic solvent ethyl acetate, and make the l...

Embodiment 2

[0031] A method for pretreatment of lithium battery electrolyte chromatography test, the steps are as follows:

[0032] (1) Prepare a sodium carbonate solution with a purity of 99.9% into a saturated aqueous sodium carbonate solution;

[0033] (2) Take the saturated sodium carbonate aqueous solution in a centrifuge tube, then add the electrolyte sample and vortex for 3 minutes, wherein the volume ratio of the saturated sodium carbonate aqueous solution to the electrolyte sample is 3:1;

[0034] (3) According to the volume ratio of organic solvent and electrolyte of 1:5, add the organic solvent n-hexane and continue to vortex for 20 minutes, and then let it stand for at least 5 minutes. After it is completely separated, take out the upper liquid and put it in a glass sample bottle;

[0035] (4) Repeat the above step (3) twice;

[0036] (5) Blow the glass sample bottle with nitrogen at a low temperature of 10°C to remove the organic solvent and make the liquid in the glass samp...

Embodiment 3

[0038] A method for pretreatment of lithium battery electrolyte chromatography test, the steps are as follows:

[0039] (1) Prepare a sodium carbonate solution with a purity of 99.9% into a saturated aqueous sodium carbonate solution;

[0040] (2) Take the saturated sodium carbonate aqueous solution in a centrifuge tube, then add the electrolyte sample and vortex for 10 minutes, wherein the volume ratio of the saturated sodium carbonate aqueous solution to the electrolyte sample is 20:1;

[0041] (3) Add the organic solvent toluene according to the volume ratio of the organic solvent and the electrolyte at 1:10, continue to vortex for 5 minutes, and then let it stand for at least 15 minutes. After the layers are completely separated, take out the upper liquid and place it in a glass sample bottle;

[0042] (4) Repeat the above step (3) twice;

[0043] (5) Blow the glass sample bottle with nitrogen at a low temperature of 25°C to remove the organic solvent and make the liquid ...

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Abstract

The invention discloses a method for carrying out chromatographic test pretreatment on a lithium battery electrolyte. A sodium carbonate solution with the purity being 99.9% is prepared into a saturated sodium carbonate water solution; the saturated sodium carbonate water solution is taken and put in a centrifugal tube, and an electrolyte sample is added for vortex oscillation; an organic solvent is added, vortex oscillation continues, standing is carried out, and after the mixture is completely layered, supernatant liquid is taken out and put in a glass sample bottle; the operation is repeated two times; finally, the glass sample bottle is subjected to nitrogen blowing at low temperature, and after the organic solvent is removed, liquid in the glass sample bottle is 3 ml to 10 ml. After chromatographic test pretreatment is carried out on the lithium battery electrolyte, qualitative and quantitative errors caused by the low content of an additive are eliminated, the lithium salt removal effect is good, therefore, consumption of gas chromatograph chromatographic columns and liner tubes is reduced, and the testing cost is reduced.

Description

technical field [0001] The invention relates to the detection of lithium battery electrolyte, in particular to a pretreatment method for detection of organic matter in lithium battery electrolyte. Background technique [0002] In recent years, with the development of new energy technologies and markets, lithium-ion batteries have become one of the most important power sources for electric vehicles. Electrolyte is one of the important components of lithium-ion batteries. Advances in lithium battery technology, such as increased energy density, improved safety, improved rate performance, and improved high and low temperature performance, etc., are inseparable from the development of new electrode systems. Open the support of electrolyte technology. In lithium-ion batteries, the composition of the lithium-ion electrolyte contains both inorganic salts and organic solvents and additives. Among them, organic solvents include dimethyl carbonate, diethyl carbonate, ethyl methyl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/08
CPCG01N30/06G01N30/08
Inventor 梅东海李涛周正会
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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