|About this Abstract
||Materials Science & Technology 2017
||Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
||Variable Frequency Microwave (VFM) Processing of Battery Electrodes
||Iftikhar Ahmad, Pu Zhang, Peter Aurora
|On-Site Speaker (Planned)
Drying of lithium ion battery electrodes for electric vehicles is high-cost operation in production. Electrodes slurry-casted onto metal foils are slowly dried in very long (~40 meter) furnaces to avoid binder migration, particle segregation or pore-blocking skin formation. VFM has been employed to penetrate and selectively target polar solvent molecules and rapidly drive them out of wet slurry casted on metal foils without arcing issues encountered with fixed frequency microwaves. Static runs identified processing times and a continuous flow prototype oven was designed, fabricated and assembled to allow necessary residence time for slurry-coated foil in process chamber. Rapid drying (3-5 X) of anode and cathode slurries casted on moving foil was performed, which resulted in electrodes properties that were identical or better than standard drying method. While most electrochemical characteristics were identical, binder migration was negligible with VFM. Details on prototype and characterization will be presented in this paper.