Changhoon Kim , Juhyoun Park , Hiram Kwak , Jae-Seung Kim , Seunggoo Jun , Dong-Hwa Seo , Yoon Seok Jung
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引用次数: 0
Abstract
The exceptional electrochemical oxidative stabilities of halide solid electrolytes (SEs) have led to extensive research on Li and Na all-solid-state batteries. In this study, we report a new K+ SE, cubic KTaCl6, with a remarkable K+ conductivity of 1.0 × 10−5 S cm−1, synthesized via a mechanochemical method. This value represents a 1000-fold enhancement over that of samples prepared through heat treatment, which is remarkable among halide K+ SEs reported to date. Through structural characterization via X-ray diffraction, Rietveld analysis, and bond valence energy landscape calculations, we reveal three-dimensional K+ migration pathways facilitated by face-sharing KCl1211− cuboctahedra. This configuration is in contrast to that of the monoclinic KTaCl6 produced through annealing, which features discontinuous K+ migration pathways. These pathways are formed by the edge- or corner-sharing of KCl1211− anti-cuboctahedra, resulting in a significantly reduced K+ conductivity. Cyclic voltammetry measurements employing three-electrode cells indicate high electrochemical stability up to ≈3.7 V (vs. K/K+).
期刊介绍:
Energy Storage Materials is a global interdisciplinary journal dedicated to sharing scientific and technological advancements in materials and devices for advanced energy storage and related energy conversion, such as in metal-O2 batteries. The journal features comprehensive research articles, including full papers and short communications, as well as authoritative feature articles and reviews by leading experts in the field.
Energy Storage Materials covers a wide range of topics, including the synthesis, fabrication, structure, properties, performance, and technological applications of energy storage materials. Additionally, the journal explores strategies, policies, and developments in the field of energy storage materials and devices for sustainable energy.
Published papers are selected based on their scientific and technological significance, their ability to provide valuable new knowledge, and their relevance to the international research community.