Abstract
A novel buckled-layer K(1.39)Mn(3)O(6) cathode was synthesized, featuring P2-oxygen stacking and P3-K sites. The presence of two independent manganese sites significantly influences the charge distribution and diffusion pathways of potassium ions during the charge and discharge processes, resulting in exceptional electrochemical performance. A reversible capacity of 105 mA h g(-1) at 100 mA g(-1) and remarkable rate capability of 70 mA h g(-1) at 1 A g(-1) were achieved, surpassing those of most previously reported layered transition metal oxide cathodes. The findings facilitate the development of innovative cathode materials.