Probing and Interpreting the Porosity and Tortuosity Evolution of Li-O₂ Cathodes on Discharge through a Combined Experimental and Theoretical Approach.

ABSTRACT: Li-O₂ batteries offer a high theoretical discharge capacity due to the formation of light discharged species such as Li₂O₂, which fill the porous positive electrode. However, in practice, it is challenging to reach the theoretical capacity and completely utilize the full electrode pore volume during discharge. With the formation of discharge products, the porous medium evolves, and the porosity and tortuosity factor of the positive electrode are altered through shrinkage and clogging of pores. A pore shrinks as solid discharge products accumulate, the pore clogging when it is filled (or when access is blocked). In this study, we investigate the structural evolution of the positive electrode through a combination of experimental and computational techniques.

SUBMITTER: Torayev A 

PROVIDER: S-EPMC7976606 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature