Issue 1, 2023

P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

Abstract

P3-type K0.6Cr0.6Ti0.4O2 is synthesized via a solid-state method and is tested as a positive electrode for potassium-ion batteries. It operates at a higher potential of Eave. = 3.14 V vs. K/K+, while delivering a reversible capacity superior to 40 mA h g−1 in a K cell. Excellent reversibility as an electrode material is achieved with a 3.9 V cutoff based on solid-state redox reaction of Cr ions. An in situ X-ray diffraction study reveals a reversible phase transition during K+ ion extraction/insertion. Furthermore, the excellent cyclability for 500 cycles at a rate of 40 mA g−1 coupled with good rate capability demonstrates its advantage as the host structure for potassium ion storage applications.

Graphical abstract: P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

Supplementary files

Article information

Article type
Communication
Submitted
23 Aug 2022
Accepted
27 Nov 2022
First published
03 Dec 2022
This article is Open Access
Creative Commons BY license

Energy Adv., 2023,2, 98-102

P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

A. K. Pandey, B. D.L. Campéon, I. Konuma and N. Yabuuchi, Energy Adv., 2023, 2, 98 DOI: 10.1039/D2YA00223J

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