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A kind of method for pretreatment of lithium battery electrolyte chromatographic test

A technology of electrolyte and lithium battery, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of large loss and interference of chromatographic columns, and achieve the effect of simple pretreatment process, fast speed and good effect

Active Publication Date: 2019-07-19
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

Method used

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  • A kind of method for pretreatment of lithium battery electrolyte chromatographic test
  • A kind of method for pretreatment of lithium battery electrolyte chromatographic test
  • A kind of method for pretreatment of lithium battery electrolyte chromatographic test

Examples

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Embodiment 1

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

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

[0026] (2) Take the saturated sodium carbonate aqueous solution in the centrifuge tube, and then add the electrolyte sample and vortex for 5 minutes, where 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 and continue to vortex for 10 minutes, and then let it stand for at least 10 minutes. After the layer is completely separated, take out the upper liquid and place 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 to remove the organic solvent ethyl acetate, and ma...

Embodiment 2

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

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

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

[0034] (3) Add organic solvent n-hexane according to the volume ratio of organic solvent and electrolyte at 1:5 and continue to vortex for 20 minutes, and then let it stand for at least 5 minutes. After the layer is completely separated, take out the upper liquid and place 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 sampl...

Embodiment 3

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

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

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

[0041] (3) Add organic solvent toluene according to the volume ratio of organic solvent and electrolyte at 1:10 and continue to vortex for 5 minutes, then let it stand for at least 15 minutes. After it is 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 in the glass sample bottle to...

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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 detecting organic matter in the 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. The advancement of lithium battery technology, such as energy density improvement, safety improvement, rate performance improvement, and high and low temperature performance improvement, is 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 not only inorganic salts, but also organic solvents and additives. Among them, organic solvents include carbonate compounds such as dimethyl ...

Claims

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Application Information

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Patent Type & Authority Patents(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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