Sodium Ion Battery Materials and Equipment
Sodium ion battery (SIB) is a type of rechargeable battery analogous to the lithium-ion battery but using sodium ions (Na+) as the charge carriers. Sodium-ion battery can be the best alternative to lithium-ion batteries, owing to their similar electrochemistry, non-toxicity, elemental-abundance and the low-cost of sodium.
MSE Supplies provides complete various SIB production lines including equipment and materials as well as customized service. Please contact us for more details.
- Electrode/Slurry Preparation
- Electrode coating and pressing
- Electrode cutting and drying
- Coin cell assembly and crimping
- Battery Testing
The electrode of sodium-ion battery (SIB) is composed of active materials, conductive agent, battery binder and dispersant follow by the feeding sequence: active material, conductive agent and binder feeding time, feeding ratio require strict process. The mixing process (rotation speed, vacuum, temperature, humidity, etc.) and final slurry properties (viscosity, particle size, solid content, etc.) should strictly follow the procedure according to the materials. Furthermore, the slurry needs to be filtered to remove large particles, precipitation, ferromagnetism and other substances. Here are recommended electrode formulations:
Electrode slurry casting is the cathode slurry extrusion coating with a doctor blade, a notched bar or a film coater or spraying on the collector metal foil (aluminum or copper). The coated foil is baked at specific temperature, time and environment. The baking temperature of NMP needs to be at 80-100℃ for over 6 hours. Afterwards, roller machines can be used for tablet pressing to increase the electrode density and reduce the porosity for better electrode stability and electrochemical properties. Otherwise, the coated materials easily fall off the substrate in the following testing process.
Use the disc cutting to punch the electrodes out of large strips. To minimize edge defects, sandwich your strip between two weight papers. The diameter of the electrode can be designed and adjusted according to punching die (Usually diameter size: working electrode<counter electrode<separator). Select cutting electrodes with no burr, no powder dropping, and smooth edge. Put electrode disks into a vacuum drying oven to further remove the moisture in the electrode. Recommended drying condition: 120℃ for 6 hours and vacuum to 0.1MPa.
Transfer the prepared electrodes to an inert atmosphere glove box and prepare the coin cell assembly components: anode case, lithium metal plate, battery separator, gasket, spring plate (nickel foam), cathode case, electrolyte, in addition to the crimper, pipette and insulating tweezers. Place the anode side of the coin cell up on the coin cell crimper. Paper towels can be used to absorb the spilled electrolyte and take it out with insulating tweezers.
Test the performance of assembled battery cells using battery analyzers provided by MSE Supplies.