Driven by the rising demand for consumer electronics, the field of all solid-state batteries employing solid electrolytes as the ion-conducting separator has attracted enormous attention in the last years. Recently, the lithium-conducting rare-earth halides A₃MX₆ (A = Li, M = Y, Er, X = Cl, Br, I) and Li₃InX₆ have been rediscovered as potential solid electrolytes, showing a good overall electrochemical performance, while the corresponding sodium-based compounds have been mostly overlooked yet. Here, we report the ionic transport properties of the Na-ion conducting rare-earth halide solid electrolyte Na_3–xEr_1–xZr_xCl₆. Na_3–xEr_1–xZr_xCl₆ shows a conductivity enhancement from 10^–9 S·cm^–1 up to of ∼0.04 mS·cm^–1 for Na_2.4Er_0.4Zr_0.6Cl₆, alongside interesting local structural rearrangements of the polyhedral motifs along the series of solid solutions. This series of halide-based sodium-ion conductors sheds light on promising compositions in search for superionic materials.

中文翻译：

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Na _{3– x} Er _{1– x} Zr _x Cl ₆ —基于空位的离子传输的基于卤化物的快速钠离子导体

在对消费电子产品的需求不断增长的推动下，近年来所有使用固体电解质作为离子导电隔膜的固态电池领域都引起了极大的关注。最近，已发现锂导电稀土卤化物A ₃ MX ₆（A = Li，M = Y，Er，X = Cl，Br，I）和Li ₃ InX ₆作为潜在的固体电解质，总体表现良好电化学性能，而相应的钠基化合物却大多被忽视。在这里，我们报告了Na离子传导稀土卤化物固体电解质Na _{3– x} Er _{1– x} Zr _x Cl ₆的离子迁移性质。Na _{3– x} Er _{1– x} Zr _x Cl ₆对Na _2.4 Er _0.4 Zr _0.6 Cl ₆的电导率从10 ^–9 S·cm ^–1升高到〜0.04 mS·cm ^–1，并伴随有趣的局部结构重排一系列固溶体的多面体图案。这一系列基于卤化物的钠离子导体为寻找超离子材料提供了广阔的前景。