Loading...
| Friend's email | |
| Your name | |
| Your email | |
| enter code | |
This page was sent successfuly
- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 56487 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Askari, Masoud
- Abstract:
- In this study, Lithium recovery process from lithium-ion battery was investigated by electrodialysis method. First, the cathode of the battery was leached in NMP to separate cathode from aluminum foil. Then, the cathode was leached in sulfuric acid with concentration 3.25 M and 10 volume percent hydrogen peroxide that pulp density was 55 g/L at 60°C for 100 minutes. in the next step, an electrodialysis cell was designed and created to recover lithium. And the influence of time, voltage, flow rate of feed solution, concentration of electrode solution and concentration of feed solution on process was investigated. Purpose of this project were investigated lithium ion recovery rate, lithium separation coefficient from divalent cations, energy consumption, current density, current efficiency and the ratio of lithium concentration to divalent cations in the cathode solution. The results showed when the voltage increased, the recovery rate, energy consumption, current density and current efficiency were increased but, the separation coefficient of lithium and the ratio of lithium concentration to divalent cations in the cathode compartment were decreased. Because increasing the voltage causes lithium to transfer faster from the feed chamber to the cathode chamber, but in the same proportion, more divalent cations also pass through the membrane. Also when the flow rate decreased or the concentration of the electrode solution increased, the recovery rate and the separation coefficient were increased. by reducing the flow rate of the feed solution due to the increase in the time the solution remains between the two membranes and the increase in the concentration of the electrode solution due to the decrease in the time of the reduction of the conductivity of the solution, the recovery rate and the separation coefficient have increased. Optimum conditions for recovery time were 300 minutes, voltage 4 volts, feed solution flow rate 10 liters/hour and electrode solution concentration 0.1 M. in this condition maximum recovery rate and separation coefficients were 40% and 1.6. In addition, influence of feed solution concentration was investigated in optimized condition. When the concentration was doubled or reached half of the initial value, the recovery rate, separation coefficients and lithium separation coefficient from divalent cations in the cathode solution were decreased. Because the ion transport number for each membrane is a constant value and the ability of ions to pass does not exceed one value, and increasing the concentration by increasing the amount of primary ion and increasing the denominator of the efficiency fraction has a negative effect on the separation rate. On the other hand, ions are conductors of electric current and Decreasing the concentration of the feed solution leads to a decrease in the conductivity of the solution and an increase in resistance, and as a result, a decrease in the efficiency of the process. Then, in order to recover as much lithium ion as possible with high purity, a multi-stage electrodialysis process was performed. The remaining solution from the electrodialysis process after the first step was used as the feed solution in the second step, and the feed solution of each step was prepared in the same way. Lithium recovery in 4 stages of the process reached 70.58%. However, due to the reduction of the separation coefficient from 1.6 in the first stage to 1.1 in the fourth stage and the decrease in the ratio of lithium to divalent cations in the feed solution after the fourth stage and the low efficiency of the fourth stage (around 0.7 ppm), electrodialysis It is not recommended in higher stages
- Keywords:
- Lithium Ion Batteries ; Electrodialysis System ; Lithium ; Ion Exchange Membrane ; Recovery ; Lithium Ion Batteries
Digital Object List-
محتواي کتاب - view
Bookmark