Hwang, Sunhyun Oh, Seungbae Choi, Woosung Chae, Sudong Ahn, Jungyoon Oh, Hyung-Suk Choi, Jae-Young Yoon, Won-Sub 2024-03-21T08:30:05Z 2024-03-21T08:30:05Z 2024-03-21 2024-04 0925-8388 https://pubs.kist.re.kr/handle/201004/149505 Volume expansion of active materials during lithium storage is one of the main issues in Li-ion batteries (LIBs) that should be addressed. In particular, large volume changes and particle cracking are problematic for electrode materials based on conversion reaction, which are considered attractive anode materials with high energy densities. In this study, a one-dimensional van der Waals (1D vdW) material, V2Se9, is proposed as a conversiontype anode material for LIBs. The V2Se9 electrode material has a 1D chain molecular structure with vdW interactions between chains to form a bulk crystal structure. The spaces between the 1D chains act as structural buffers and provide short Li+ diffusion paths that can improve the electrochemical performance of the electrode materials. The V2Se9 electrode exhibits a high reversible capacity of 563.3 mAh g-1 at 100 mA g-1 and a high rate capability of 109.1 mAh g- 1 at 3200 mA g- 1. The capacity retention of V2Se9 electrodes is 83.72% after 100 cycles. Synchrotron X-ray diffraction and X-ray absorption spectroscopy reveal the formation of Li2Se and V metal, indicating that Li ion storage occurs via the conversion reaction. The structural stability of V2Se9 is demonstrated using SEM measurements of the discharged and charged V2Se9 electrodes during cycling. These results demonstrate the reaction mechanism of V2Se9 and highlight the potential of 1D vdW materials as highperformance anode materials in LIBs. English Elsevier BV One-dimensional van der Waals V2Se9 as a conversion-type anode material for advanced Li rechargeable batteries Article 10.1016/j.jallcom.2024.173541 1 Journal of Alloys and Compounds, v.980 Journal of Alloys and Compounds 980 N scie scopus 001171616100001 2-s2.0-85185154374 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article X-RAY-ABSORPTION LITHIUM ION BATTERIES ELECTRODES CARBON INTERCALATION TRANSITION LITHIATION MECHANISM NB2SE9 Lithium-ion batteries Transition metal chalcogenide 1D van der Waals material Surface-exposed Se Conversion reaction