Layered P3 type K0.48Ni0.2Co0.2Mn0.6O2 with microspherical and microcubic mixed morphology as a cathode material for potassium-ion batteries

Potassium-ion batteries (KIBs) have been recognized as one promising type of new energy storage technology. Exploring and developing novel and effective cathode materials has become the hotspot research area. Herein, a layered K0.48Ni0.2Co0.2Mn0.6O2 (KNCMO) with a mixed morphology of microspheres and microcubes was prepared. When evaluated for use in KIBs, the KNCMO exhibited outstanding electrochemical properties. In practical terms, KNCMO can deliver a reversible capacity of similar to 57 mAh g(-1) at 40 mA g(-1), and shows good rate performance. When the specific current was increased to 400 mA g(-1), a considerable reversible capacity of similar to 35 mAh g(-1) after 350 cycles can be obtained. This work can serve as a broader insight into the future development of cathode materials for potassium-ion batteries. (C) 2020 Elsevier B.V. All rights reserved.