Choi, Yoon Jeong Bae, Ji-Youn Park, Seongsoo Kim, Yeseul Kim, So Hee Lee, Hansol Bae, Jong-Seong Kim, Taeho Shin, Sunyoung Lee, Yongju Weon, Byung Mook Moon, Janghyuk Yu, Seung-Ho 2025-09-22T08:30:20Z 2025-09-22T08:30:20Z 2025-09-16 2025-11 1614-6832 https://pubs.kist.re.kr/handle/201004/153216 The incorporation of silicon monoxide (SiO) into graphite anodes improves the energy density of lithium-ion batteries. However, it falls short of the long-term durability of pure graphite, and research on their cycling performance remains limited. This study observes a sudden capacity decay in graphite/SiO anodes during long-term cycling at room temperature (RT) and a moderate C-rate. This decay arises from the mechanical degradation of SiO, leading to the formation of a "SiO-SEI crust" that consumes lithium ions. This phenomenon does not occur at higher temperatures or lower C-rates, implying that larger diffusion-induced stress from lithium-ion gradients at RT and 1 C accelerates SiO degradation. Furthermore, introducing a relaxation step to reduce the lithium-ion gradient mitigates this sudden capacity decay, supporting diffusion-induced stress as a critical factor in the degradation mechanism. These findings emphasize the role of diffusion-induced stress in the performance degradation of Si-based batteries and provide valuable insights for enhancing the lifespan of composite anodes. English Wiley-VCH Verlag Origins of Abrupt Capacity Degradation in Lithium-Ion Batteries with Silicon-Based Anodes Article 10.1002/aenm.202502143 1 Advanced Energy Materials, v.15, no.41 Advanced Energy Materials 15 41 Y scie scopus 001563846000001 2-s2.0-105015208038 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article NEGATIVE ELECTRODE POUCH CELLS SIO ANODES GRAPHITE PERFORMANCE MECHANISMS DYNAMICS diffusion-induced stress graphite/SiO anodes lithium-ion batteries long-term cycling sudden capacity decay