Kim, Ji Hwan Kim, Mihyun Kim, Seong-Jun Kim, Shin-Yeong Yu, Seungho Hwang, Wonchan Kwon, Eunji Lim, Jae-Hong Kim, So Hee Sung, Yung-Eun Yu, Seung-Ho 2024-10-30T00:30:08Z 2024-10-30T00:30:08Z 2024-10-30 2024-09 https://pubs.kist.re.kr/handle/201004/150909 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 the growth of S particles, resulting in improved lithium sulfur battery performance compared to cells using positive electrodes containing only Se or S as active materials. By adjusting the Se-to-S ratio, we demonstrate that a low concentration of Se enables uniform catalytic sites, promotes the homogeneous distribution of S and favours improved lithium sulfur battery performance. English Nature Publishing Group Understanding the electrochemical processes of SeS2 positive electrodes for developing high-performance non-aqueous lithium sulfur batteries Article 10.1038/s41467-024-51647-5 1 Nature Communications, v.15, no.1 Nature Communications 15 1 Y scie scopus 001389506900010 Multidisciplinary Sciences Science & Technology - Other Topics Article