钾
材料科学
电解质
离子
阴极
电压
离子键合
化学工程
无机化学
电极
化学
电气工程
冶金
物理化学
工程类
有机化学
作者
Titus Masese,Kazuki Yoshii,Yoichi Yamaguchi,Toyoki Okumura,Zhen Dong Huang,Masaru Kato,Keigo Kubota,Junya Furutani,Yuki Orikasa,Hiroshi Senoh,Hikarí Sakaebe,Masahiro Shikano
标识
DOI:10.1038/s41467-018-06343-6
摘要
Abstract Rechargeable potassium-ion batteries have been gaining traction as not only promising low-cost alternatives to lithium-ion technology, but also as high-voltage energy storage systems. However, their development and sustainability are plagued by the lack of suitable electrode materials capable of allowing the reversible insertion of the large potassium ions. Here, exploration of the database for potassium-based materials has led us to discover potassium ion conducting layered honeycomb frameworks. They show the capability of reversible insertion of potassium ions at high voltages (~4 V for K 2 Ni 2 TeO 6 ) in stable ionic liquids based on potassium bis(trifluorosulfonyl) imide, and exhibit remarkable ionic conductivities e.g. ~0.01 mS cm −1 at 298 K and ~40 mS cm –1 at 573 K for K 2 Mg 2 TeO 6 . In addition to enlisting fast potassium ion conductors that can be utilised as solid electrolytes, these layered honeycomb frameworks deliver the highest voltages amongst layered cathodes, becoming prime candidates for the advancement of high-energy density potassium-ion batteries.
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