|M.Sc Student||Loiferman Ilya|
|Subject||A Zinc-Bromine Redox Flow Battery with Fluidized Bed|
|Department||Department of Mechanical Engineering||Supervisor||Assistant Professor Matthew E. Suss|
|Full Thesis text|
As society increasingly relies on renewable energy from intermittent sources such as wind and solar, the efficient storage of renewable energy is required for decoupling energy delivery from energy generation. One of the most promising technologies for grid storage are redox flow batteries (RFBs) due to their geographical flexibility and potential for high round-trip energy efficiency. The zinc-bromide RFB is considered among the most promising RFB chemistries, but it is currently limited operationally by the formation of zinc dendrites during zinc electrodeposition when charging the cell.
Flowing solid-liquid suspensions, such as slurries or fluidized beds, are widely employed in chemical processing industries for chemical separations and combustion reactions due to rapid heat and mass transfer between the fluid and solid phases. Recently, slurry electrodes were proposed as a solution for metal deposition in an all-iron RFB, however the battery demonstrated poor round-trip energy efficiency and low slurry solid weight percent and electric conductivity. Recently, it has been demonstrated that fluidized beds, which are distinguished from slurries in that a significant gravitational force acts on the solid particles, can allow for denser packed flowable electrode structures relative to slurries. Thus, fluidized bed electrodes have the potential to enable improved metal deposition in a RFB cell. In this work we describe the development of a novel zinc-bromine RFB prototype with a fluidized bed electrode, and results of performance characterization experiments such as charge-discharge cycling and polarization curves. We further characterize the amount of zinc deposited during cell charging onto the flowing fluidized bed electrode and current collector separately via novel dual-discharge experiments.