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| Type |
Poster Presentation |
| Area |
Electrochemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 20일 (금요일) 13:00~14:30 |
| Code |
ELEC.P-494 |
| Subject |
Electrochemical Zinc Ion Intercalation and Structural Properties of Chevrel Phase and Rhombohedral Zinc Hexacyanoferrate for Post Li-Ion battery |
| Authors |
Munseok Chae, Seung-Tae Hong*
Energy Sysytems Engineering, Daegu Gyeongbuk Institute of Science & Technology, Korea
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| Abstract |
Zinc ion batteries have received attention as one type of these multivalent ion batteries (post-LIBs) due to their potential applications to large-scale energy storage systems. Zinc has various merits, including safety, abundance, low cost, environmental friendliness, and large theoretical capacity of 820 mAh/g. Rhombohedral zinc hexacyanoferrate [Zn3Fe2(CN)12 or ZnHCF] has also been shown to intercalate Zn2+ ions into large, open sites of the porous three-dimensional (3D) framework in an aqueous electrolyte. There was significant structural change during the electrochemical zinc insertion. However, the crystal structure of the zinc-inserted phase has not been determined yet. One of the Chevrel phases, ZnxMo6S8 phase (0 ≤ x ≤2), has been noticed as a potential electrode material for zinc ion batteries. Zn2Mo6S8 was prepared from Mo6S8 electrochemically in aqueous as well as organic Zn-containing electrolytes, with two potential plateau regions, one for 0 ≤ x ≤ 1, and the other for 1 ≤ x ≤ 2. It has been noted that Zn2Mo6S8 seems to be obtained only via the topotactic insertion reaction but not by direct synthesis at high temperatures, and its crystal structure has not yet been determined. In this study, we present the electrochemical insertion and extraction properties of Zn2+ in ZnxMo6S8 (0 ≤ x ≤ 2) and Zn3+xFe2(CN)12 (0 ≤ x ≤ 0.75) in aqueous or organic electrolytes, and finally the crystallographic analyses of the electrochemically obtained phases, where the new structures of Zn2Mo6S8 and Zn3.75Fe2(CN)12 were determined for the first time. In order to locate the inserted zinc positions, the technique of structural determination from powder diffraction data was applied. |
| E-mail |
anstjr90@dgist.ac.kr |
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120th General Meeting of the KCS