Ji Hyun Um Aihua Jin Xin Huang Jeesoo Seok Seong Soo Park Janghyuk Moon Mihyun Kim Kim So Hee Hyun Sik Kim Sung-Pyo Cho Hector D. Abruna Seung-Ho Yu 2024-01-19T12:30:58Z 2024-01-19T12:30:58Z 2022-01-10 2022-04 1754-5692 https://pubs.kist.re.kr/handle/201004/115499 As a promising cathode material, selenium has attracted a great deal of research interest due to its high theoretical capacity analogous to sulfur in lithium-chalcogen batteries. However, unlike S cathodes, mechanistic understanding including fundamental observations on the formation of Li2Se and Se deposits, and their dissolution in Se cathodes remains at an early stage. Here, we directly visualize the dissolution and deposition reactions of Se cathodes using operando transmission X-ray microscopy, and build a nucleation site distribution map by tracking the individual solidification of electrolyte-soluble polyselenide intermediates into Se deposits. This real-time analysis reveals the nucleation behavior dependent on the depletion of polyselenides as well as the morphological characteristics through their subsequent growth, along with the different nucleation modes for particle-like Li2Se upon discharge and dendritic Se upon charge. We further propose that appropriate operating conditions, prioritizing the nucleation over the growth, can effectively utilize Se, precluding the dendritic growth. English Royal Society of Chemistry Competitive nucleation and growth behavior in Li-Se batteries Article 10.1039/D1EE03619J 1 Energy & Environmental Science, v.15, no.4, pp.1493 - 1502 Energy & Environmental Science 15 4 1493 1502 N scie scopus 000762943400001 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article X-RAY-ABSORPTION LITHIUM-METAL GROWTH SELENIUM SULFUR NANOWIRES MECHANISM KINETICS CATHODE ENERGY