WP 2

WP2 is aiming to improve the power density and conversion efficiency of the membrane stack. This is achieved from research on mass transfer mechanisms and polarization phenomena during charge and discharge and research how these mechanisms can be manipulated in order to increase the round-trip efficiency and power density of the BAoBaB.

The main objective of this Work Package is to improve the power density and conversion efficiency of the membrane stack. This is achieved from research on mass transfer mechanisms at macroscopic (e.g., ionic short-circuits) and microscopic (e.g., polarization) scale during charge and discharge. By varying the geometries of membranes, electrodes and manifolds, and tuning the osmotic composition, these mechanisms can be manipulated in order to increase the round-trip efficiency and power density of the BAoBaB.
The specific objectives of the Work Package are:
(i) to model and validate experimentally mass transfer, electrochemical conversion and fluid dynamics in BAoBaB and to control parasitic losses due to unintended mass transfer, concentration polarization phenomena and pressure loss.
(ii) to select and optimize the composition of the osmotic solutions.
(iii) to determine and optimize the thermodynamic efficiency and power density during charge and discharge.
This Work Package will closely interact with the component development (e.g., membranes) in WP3 and will create the knowledge that supports the validation in WP5.

WP2 is divided in 4 main tasks:

Task 2.1 Mass transfer near interfaces
Task 2.2 Reducing internal losses
Task 2.3 Composition of osmotic solutions
Task 2.4 Battery characteristics