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
摘要
卤化物固态电解质(SE)具有优异的电化学氧化稳定性,这促使人们对 Li 和 Na 全固态电池进行了广泛的研究。在本研究中,我们报告了一种新型 K+ SE--立方 KTaCl6,它通过机械化学方法合成,K+电导率高达 1.0 × 10-5 S cm-1。与通过热处理制备的样品相比,该值提高了 1000 倍,这在迄今为止报道的卤化物 K+ SE 中是非常突出的。通过 X 射线衍射、里特维尔德分析和键价能谱计算进行结构表征,我们揭示了面共享 KCl1211- 立方八面体促进 K+ 迁移的三维路径。这种构型与退火生成的单斜 KTaCl6 形成鲜明对比,后者具有不连续的 K+ 迁移路径。这些路径是由 KCl1211- 反立方八面体的边角共享形成的,从而导致 K+ 传导性显著降低。采用三电极电池进行的循环伏安测量表明,其电化学稳定性高达 ≈3.7 V(相对于 K/K+)。
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.