title: P2- and P3-KxCoO2as an electrochemical potassium intercalation host.
abstract: Reversible and topotactic potassium intercalation of P2- and P3-KxCoO2electrodes is studied in non-aqueous K cells for the first time. They deliver a highly reversible capacity of 60 mA h g-1in 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-KxCoO2are compared to those of O2-LixCoO2and P2-NaxCoO2.
authors.affiliation: Department of Applied Chemistry, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan. komaba@rs.kagu.tus.ac.jp.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Hironaka
authors.affiliation: 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.
authors.forename: Kei
authors.initials: K
authors.lastname: Kubota
authors.affiliation: 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.
authors.forename: Shinichi
authors.identifier: http://orcid.org/0000-0002-9757-5905
authors.initials: S
authors.lastname: Komaba