Huang Wenze, Matsui Naoki, Hori Satoshi, Suzuki Kota, Hirayama Masaaki, Yonemura Masao, Saito Takashi, Kamiyama Takashi, Sasaki Yuki, Yoon Yongsub, Kim Saheum, Kanno Ryoji
Research Center for All-Solid-State Battery, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan.
J Am Chem Soc. 2022 Mar 23;144(11):4989-4994. doi: 10.1021/jacs.1c13178. Epub 2022 Feb 9.
Solid-state electrolytes that exhibit high ionic conductivities at room temperature are key materials for obtaining the next generation of safer, higher-specific-energy solid-state batteries. However, the number of currently available crystal structures for use as superionic conductors remains limited. Here, we report a lithium superionic conductor, LiSiS, with tetragonal crystal symmetry, which possesses a new three-dimensional framework structure consisting of isolated edge-sharing tetrahedral dimers. This species exhibits an anomalously high ionic conductivity of 2.4 mS cm at 298 K, which is 3 orders of magnitude higher than the reported ionic conductivity for its orthorhombic polymorph. The framework of this conductor consists mainly of silicon, which is abundant in natural resources, and its further optimization may lead to the development of new solid-state electrolytes for large-scale applications.
在室温下具有高离子电导率的固态电解质是获得下一代更安全、更高比能量固态电池的关键材料。然而，目前可用作超离子导体的晶体结构数量仍然有限。在此，我们报道了一种具有四方晶体对称性的锂超离子导体LiSiS，它拥有一种由孤立的边共享四面体二聚体组成的新型三维骨架结构。该物质在298 K时表现出异常高的2.4 mS cm离子电导率，比其正交晶型多晶型物报道的离子电导率高3个数量级。这种导体的骨架主要由自然资源丰富的硅组成，对其进一步优化可能会促成用于大规模应用的新型固态电解质的开发。
