Rechargeable potassium-ion batteries with honeycomb-layered tellurates as high voltage cathodes and fast potassium-ion conductors

• DOI: 10.1038/s41467-018-06343-6
• Publication Date: 2018-09-14T09:29:46Z
• Authors: Titus Masese; Kazuki Yoshii; Yoichi Yamaguchi; Toyoki Okumura; Zhen-Dong Huang; Minami Kato; Keigo Kubota; Junya Furutani; Yuki Orikasa; Hiroshi Senoh; Hikari Sakaebe; Masahiro Shikano
• Keywords: Science; Q; 11. Sustainability; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 7. Clean energy; Article; 0104 chemical sciences

Abstract Rechargeable potassium-ion batteries have been gaining traction as not only promising low-cost alternatives to lithium-ion technology, but also high-voltage energy storage systems. However, their development and sustainability are plagued by the lack of suitable electrode materials capable allowing reversible insertion large potassium ions. Here, exploration database for potassium-based has led us discover ion conducting layered honeycomb frameworks. They show capability ions at high voltages (~4 V K 2 Ni TeO 6 ) in stable ionic liquids based on bis(trifluorosulfonyl) imide, exhibit remarkable conductivities e.g. ~0.01 mS cm −1 298 ~40 –1 573 Mg . In addition enlisting fast conductors that can be utilised solid electrolytes, these frameworks deliver highest amongst cathodes, becoming prime candidates advancement high-energy density batteries.