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
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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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