Understanding the electrochemical processes of SeS₂ positive electrodes for developing high-performance non-aqueous lithium sulfur batteries.

ABSTRACT: SeS₂ positive electrodes are promising components for the development of high-energy, non-aqueous lithium sulfur batteries. However, the (electro)chemical and structural evolution of this class of positive electrodes is not yet fully understood. Here, we use operando physicochemical measurements to elucidate the dissolution and deposition processes in the SeS₂ positive electrodes during lithium sulfur cell charge and discharge. Our analysis of real-time imaging reveals the pivotal role of Se in the SeS₂ nucleation process, while S enables selective depositions. During the initial discharge, SeS₂ converts into Se and S separately, with the dissolved Se acting as nucleation sites due to their lower nucleation potential. The Se effectively catalyzes

SUBMITTER: Kim JH 

PROVIDER: S-EPMC11371820 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature