Bismuth oxychloride nanoflake assemblies as a new anode for potassium ion batteries

Abstract

This work reports the first demonstration of bismuth oxyhalides as anode materials in potassium-ion batteries. BiOCl nanoflake assemblies deliver high capacities of 367 mA h g⁻¹ at 50 mA g⁻¹ and 175 mA h g⁻¹ at 1 A g⁻¹. The formation of K–Bi alloys at an early stage of potassiation is observed.