Kwon, J.-H. N., Chaudhari K. Coy, E. Seo, J.H. Ahn, S.J. Lee, Y.-H. Lee, S. Cho, Y.C. Choi, O. Lee, K.S. Son, D.I. Kim, Y. 2024-01-19T13:04:06Z 2024-01-19T13:04:06Z 2022-01-10 2021-12 2168-0485 https://pubs.kist.re.kr/handle/201004/115994 Conversion reaction-based transition metal oxides have been considered as advanced anode materials for lithium batteries because of their high storage capacities; however, the initial lithiation/delithiation mechanism remains poorly understood. In this study, we synthesized single-crystalline spindle-type mesoporous Fe2O3 (MS-Fe2O3), which contained a high fraction of textural porosity that appears as a unique tunnel structure. The MS-Fe2O3 electrode exhibited a remarkably high initial Coulombic efficiency of 85.4% and stable cycling performance with a specific capacity of 1250 mA h g-1 after 100 cycles. During the lithiation process, the initial α-Fe2O3 phase was transformed to nanograin-Fe embedded in the Li2O matrix, while subsequent delithiation changed the Fe phase into γ-Fe2O3. Despite the initial irreversible phase conversion, a reversible electrochemical reaction (Fe3+ → Fe0 → Fe3+) was retained in the first cycle, leading to the high ICE and discharge capacity. This study provides crucial information on the lithiation/delithiation mechanism of transition metal oxides and benefits the design of advanced materials for lithium batteries. ？ 2021 American Chemical Society. English American Chemical Society Reversible Conversion Reactions of Mesoporous Iron Oxide with High Initial Coulombic Efficiency for Lithium-Ion Batteries Article 10.1021/acssuschemeng.1c05335 1 ACS Sustainable Chemistry & Engineering, v.9, no.49, pp.16627 - 16636 ACS Sustainable Chemistry & Engineering 9 49 16627 16636 N scie scopus 000753961000010 2-s2.0-85120320458 Chemistry, Multidisciplinary Green & Sustainable Science & Technology Engineering, Chemical Chemistry Science & Technology - Other Topics Engineering Article HIGH-RATE CAPABILITY ANODE MATERIAL 3-DIMENSIONAL GRAPHENE ALPHA-FE2O3 NANOTUBES STRUCTURAL EVOLUTION CARBON NANOTUBES HIGH-CAPACITY PERFORMANCE FE2O3 SURFACE conversion reaction Coulombic efficiency lithium-ion battery mesoporous iron oxide microwave synthesis