On March 6, Lu Ziheng, an assistant researcher at the Photonic Information and Energy Materials Research Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and Francesco Ciucci, a professor of mechanical engineering at the Hong Kong University of Science and Technology, proposed a new mechanism for ion superconductivity in solid electrolytes and designed a new low-dimensional Anti-perovskite solid electrolyte. The relevant results were published online in Energy Storage Materials (DOI: 10.1016 / j.ensm.2020.03.005) under the title Superionic Conduction in Low-Dimensional-Networked Anti-Perovskites. , CiteScore: 15.05), Lu Ziheng is the first author, and Francesco Ciucci is the corresponding author.
The rapid transmission of solid cations is essential for a variety of solid-state devices, the most prominent of which is solid-state batteries. As a next-generation high-specific energy, high-security energy storage technology that is expected to replace existing lithium-ion batteries, solid-state batteries have received widespread attention in academia and industry. Currently, one of the core pain points of solid-state batteries is the low ionic conductivity of solid-state electrolytes, which limits the output power of solid-state batteries at room temperature, and thus limits the practical use of solid-state batteries. At present, the design of solid electrolyte materials with high ionic conductivity is one of the core topics of solid-state ionology and is also a recognized problem.
Inspired by the low-dimensional organic-inorganic anti-perovskite in the photovoltaic field, the team proposed a design idea to build a solid electrolyte of different dimensions anti-perovskite crystal layer by layer from the basic "structural unit". The team research found that the softening of phonons in the low-dimensional structure can cause the rapid transport of lithium ions. On this basis, the team predicts that two-dimensional and below two-dimensional anti-perovskite not only has extremely high stability, but also has an ionic conductivity close to that of a liquid electrolyte (10 mS cm-1). At present, the team is actively synthesizing such materials and has made some progress.
The design idea of ​​gradually constructing solid electrolytes from structural templates and the mechanism of ion superconductivity induced by phonon softening proposed by this study have an important guiding role in the design of key materials in next-generation solid-state batteries.
Schematic diagram of solid electrolyte template design based on basic "structural unit" (left) and crystal structure of new low-dimensional anti-perovskite solid electrolyte (right)
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