Inside Cover Picture

Abstract

The BiOCl_0.5Br_0.5 with flower-like structure exhibits the layered structure, in which the self-hybridization of chlorine and bromine atoms induces an intensified internal electric field and wider Van der Waals gap, providing a fast diffusion path for K⁺ ion. Combining the decreasing of the electron polarons induced by the hybridized structure and the in situ formation of hole-like polarons caused by the dynamic K⁺ ion-halogen atoms correlation, the BiOCl_0.5Br_0.5 anode exhibits a stimulative K⁺ ion diffusion kinetics, thus enabling a high electrochemical performance in potassium-ion batteries. More details are discussed in the article by Wu et al. on pages 2589—2598.