Ultrathin bismuth oxychloride nanosheet for enhanced potassium storage

Ultrathin bismuth oxychloride nanosheets have been realized as anodes with outstanding performance in potassium ion batteries. It can deliver a capacity of 196.8 mAh g−1 after 50 cycles and 151.8 mA h g−1 after 100 cycles at 50 mA g−1 due to the two-dimensional nature, which facilitates the electron transport and ion diffusion, and achieves continuous conductive matrix. Our results provide distinct insights into electrode design for energy storage devices.