Park, Hyunyoung Lee, Yongseok Cho, Min-kyung Kang, Jungmin Ko, Wonseok Jung, Young Hwa Jeon, Tae-Yeol Hong, Jihyun Kim, Hyungsub Myung, Seung-Taek Kim, Jongsoon 2024-01-19T15:04:29Z 2024-01-19T15:04:29Z 2021-09-04 2021-03-01 1754-5692 https://pubs.kist.re.kr/handle/201004/117278 Despite the high energy density of layered-type cathode materials for Na-ion batteries, their two-dimensional crystal structure suffers a large volume change and phase transition during Na+ de/intercalation, which often results in their poor cycling performances. Thus, a robust three-dimensional framework with minimal structural change is required for stable electrochemical sodium storage. Here, we introduce an earth-abundant element-based trigonal-type Na-Fe-F compound (Na2Fe2F7) with three-dimensionally interconnected FeF6 octahedra and three-dimensional Na+ diffusion pathways. Through combined studies using first-principles calculations and experiments, we confirm that Na2Fe2F7 delivers excellent power-capability due to large three-dimensional Na+ diffusion pathways as well as ultra-long cycling performance due to negligible structural change during Na+ de/intercalation. These results will guide new insights for material discovery for high performance rechargeable batteries. English Royal Society of Chemistry Na2Fe2F7: a fluoride-based cathode for high power and long life Na-ion batteries Article 10.1039/d0ee02803g 1 Energy & Environmental Science, v.14, no.3, pp.1469 - 1479 Energy & Environmental Science 14 3 1469 1479 scie scopus 000639555200014 2-s2.0-85103515308 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article PRUSSIAN BLUE ELECTRODE PERFORMANCE CRYSTAL-STRUCTURE FE MECHANISM NA2FEPO4F DEFECTS STORAGE Batteries Na-ion batteries