Lithium ion electrolyte packaging barrel cleaning steps
The electrolyte packaging barrel includes a barrel body and a flange fixed at the opening for closing the opening of the packaging barrel. The flange is equipped with a nozzle for inputting liquid and gas into the barrel. To clean the packaging barrel, follow the following steps:
①Use nitrogen to drain out the residual liquid in the barrel;
②Pour nitrogen into the barrel to purge the barrel. The nitrogen pressure is 0.15-0.25MPa and the purge time is 2-5 minutes. Using the above method can ensure the purging effect while reducing the amount of nitrogen.
③The first cleaning step: input the first solvent into the barrel for the first cleaning, then detect the moisture in the first solvent and the purity of the first solvent itself, and then discharge the first solvent;
④Second cleaning step: Input the second solvent into the barrel for the second cleaning, and then detect the moisture in the second solvent and the purity of the second solvent itself. The moisture in the solvent is ≤10ppm and the purity of the solvent itself. ≥99.9 is qualified, and then the second solvent will be discharged;
⑤ Input the low-boiling carbonate solvent contained in the electrolyte formula into the barrel through the spray ball of the electrolyte barrel. After the flange is fully contacted with the solvent in the barrel, let it stand for at least 1 hour, and then take a sample to detect the moisture in the solvent in the barrel. and the purity of the solvent itself in the barrel. The water in the solvent is ≤10ppm and the purity of the solvent itself is ≥99.9. Then the solvent is dissolved in the barrel.
Agent discharge.
Adding flange cleaning steps can improve the electrolyte barrel cleaning effect.
⑥Purge nitrogen into the barrel again; the pressure of nitrogen is 0.15-0.25MPa, and the purging time is 2-5 minutes.
Wherein, the first solvent and the second solvent are both low-boiling carbonate solvents contained in the electrolyte formula, and they are of the same type or different types. By repeatedly using solvents, moisture, and solvent purity detection to control the cleaning effect, there is no need to split the electrolyte barrel or use a large amount of high-purity water. Cleaning can be completed by purging with a small amount of solvent and nitrogen. It not only simplifies the steps, takes less time, and has high bucket washing efficiency, but it is also low-cost, energy-saving and environmentally friendly, and does not cause harm to people.
Repeat the first cleaning step and/or the second cleaning step at least 2 times. Repeating the cleaning steps can improve the cleaning effect.
The low-boiling carbonate solvent contained in the electrolyte formula is dimethyl carbonate, ethyl methyl carbonate or diethyl carbonate. Solvents improve cleaning results and are easily available.