POSITIVE ACTIVE MATERIAL FOR POTASSIUM SECONDARY BATTERIES POTASSIUM SECONDARY BATTERIES COMPRISING THE POSITIVE ACTIVE MATERIAL

摘要

The present invention relates to a cathode active material for a potassium secondary battery, and a cathode active material according to the present invention is a crystalline material containing K, a transition metal, P and O, Wherein the Bragg angle (2?) Of the X-ray diffraction pattern is in the range of 14.7 to 15.7, 22.1 to 23.1, 25.5 to 26.5, and 29.7 to 30.8 when the relative intensity of the diffraction peak is 100% And an image showing a diffraction peak having a relative intensity of 5% or more as a columnar phase.