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Zhang, Z,*; Wang, H.*; 吉川 浩史*; 松村 大樹; 畑尾 秀哉*; 石川 理史*; 上田 渉*
ACS Applied Materials & Interfaces, 12(5), p.6056 - 6063, 2020/02
被引用回数:6 パーセンタイル:31.09(Nanoscience & Nanotechnology)Developing new cathode-active materials for rechargeable batteries is important to fulfill the growing demands of energy transformation, storage, and utilization. Zeolitic transition-metal oxides based on vanadomolybdate, constructed by pentagon metal-oxygen clusters as building blocks and metal ions as linkers in a trigonal symmetry, are good candidates for cathodes of Na rechargeable batteries. The material is activated via amorphization of the crystal structure in the ab plane during discharging process, keeping the molecular structure of the building blocks stable, which causes high specific capacity and good cycle performance.
Wang, H.*; 磯部 仁*; 清水 剛志*; 松村 大樹; 伊奈 稔哲*; 吉川 浩史*
Journal of Power Sources, 360, p.150 - 156, 2017/08
被引用回数:13 パーセンタイル:41.36(Chemistry, Physical)-phase LiVO, which shows superior electrochemical performance as cathode material in Li-ion batteries, was prepared by annealing the polyoxovanadate cluster Li[VO(CO)]. The reaction mechanism was studied using X-ray absorption fine structure (XAFS), powder X-ray diffraction (PXRD), and X-ray photoelectron spectroscopy (XPS) analyses. The X-ray absorption near edge structure (XANES) and XPS results reveal that -LiVO undergoes two-electron redox reaction per VO pyramid unit, resulting in a large reversible capacity of 260 Ah/kg. The extended X-ray absorption fine structure (EXAFS) and PXRD analyses also suggest that the V-V distance slightly increases, due to the reduction of V to V during Li ion intercalation as the material structure is maintained. As a result, -LiVO shows highly reversible electrochemical reaction with x = 0.1-1.9.