High Volumetric Energy Density Li-O2 Battery with Folded Cell Structure: Cell scale Experiment, Modeling and Simulation
Journal
Joule
Date
2018.12.20
Abstract
Li-oxygen batteries as the beyond intercalation based current battery system got enourmous attention due to its ultra high theoretical energy density. However, the energy densities used and reported have been usually following that of intercalation based battery system, energy per active material. This makes hard to estimate real cell scale energy density one can realistically obtain. By seamless integration of all best components for Li-O2 battery with folded cell structure, as high as 1,214 Wh/kg and 896 Wh/L of complete cell level gravimetric and volumetric energy density is achieved.
cell scale electrochemical phenomena is modeled by combining multi physics including oxygen gas flow in GDL by cathode reaction generated pressure drop with dynamic porosity and resistance change during Li2O2 formation reaction in the cathode. The results informs that there are many failure mode depending on the cell geometry and cathode compositions.