Suzuki Jinya, Okochi Hiroyasu, Matsui Naoki, Nagase Teppei, Tochizawa Haruki, Sahara Hiroki, Nishikubo Takumi, Sakai Yuki, Ohmi Takuya, Pan Zhao, Saito Takashi, Saitoh Hiroyuki, Ikezawa Atsunori, Arai Hajime, Kanno Ryoji, Yamamoto Takafumi, Azuma Masaki
Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan.
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8502, Japan.
J Am Chem Soc. 2023 Aug 2;145(30):16398-16405. doi: 10.1021/jacs.3c02240. Epub 2023 Jul 24.
Oxyhydrides with multi-anions (O and H) are a recently developed material family and have attracted attention as catalysts and hydride ion conductors. High-pressure and high-temperature reactions are effective in synthesizing oxyhydrides, but the reactions sometimes result in inhomogeneous products due to insufficient diffusion of the solid components. Here, we synthesized new perovskite oxyhydrides SrVOH and SrVOH. We demonstrated that the addition of SrCl flux promotes diffusion during high-pressure and high-temperature reactions, and can be used for selective synthesis of the oxyhydride phases. We conducted in-situ synchrotron X-ray diffraction measurements to reveal the role of this flux and reaction pathways. We also demonstrated the electronic and magnetic properties of the newly synthesized oxyhydrides and that they work as anode materials for Li-ion batteries with excellent reversibility and high-rate characteristics, the first case with an oxyhydride. Our synthesis approach would also be effective in synthesizing various types of multi-component systems.
含有多种阴离子（氧和氢）的氢氧化物是最近开发的一类材料，作为催化剂和氢离子导体受到了关注。高压和高温反应在合成氢氧化物方面很有效，但由于固体成分扩散不足，这些反应有时会导致产物不均匀。在这里，我们合成了新的钙钛矿型氢氧化物SrVOH和SrVOH。我们证明，添加SrCl助熔剂可促进高压和高温反应过程中的扩散，并可用于选择性合成氢氧化物相。我们进行了原位同步加速器X射线衍射测量，以揭示这种助熔剂的作用和反应途径。我们还展示了新合成的氢氧化物的电子和磁性特性，并且它们作为锂离子电池的负极材料具有出色的可逆性和高倍率特性，这是氢氧化物的首例。我们的合成方法在合成各种类型的多组分体系方面也将是有效的。
