P2- and P3-KxCoO2 as an electrochemical potassium intercalation host

Yuya Hironaka; Kei Kubota; Shinichi Komaba

doi:10.1039/c7cc00806f

P2- and P3-K_xCoO₂ as an electrochemical potassium intercalation host

Chem Commun (Camb). 2017 Mar 28;53(26):3693-3696. doi: 10.1039/c7cc00806f.

Authors

Yuya Hironaka¹, Kei Kubota², Shinichi Komaba²

Affiliations

¹ Department of Applied Chemistry, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan. komaba@rs.kagu.tus.ac.jp.
² Department of Applied Chemistry, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan. komaba@rs.kagu.tus.ac.jp and Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan.

PMID: 28294241
DOI: 10.1039/c7cc00806f

Abstract

Reversible and topotactic potassium intercalation of P2- and P3-K_xCoO₂ electrodes is studied in non-aqueous K cells for the first time. They deliver a highly reversible capacity of 60 mA h g^-1 in the voltage range 2.0-3.9 V accompanied by reversible phase transitions including potassium/vacancy orderings. The electrochemical properties and structural change of P2-K_xCoO₂ are compared to those of O2-Li_xCoO₂ and P2-Na_xCoO₂.