K0.67Ni0.17Co0.17Mn0.66O2: A cathode material for potassium-ion battery

•A novel layered ternary material, K0.67Ni0.17Co0.17Mn0.66O2 has been synthesized.•K0.67Ni0.17Co0.17Mn0.66O2 was introduced as a cathode for potassium ion batteries.•Highly reversible K+ intercalation/deintercalation is demonstrated.•A reversible discharge capacity of 76.5 mAh/g at 20 mA/g was obtained.

A novel layered ternary material K0.67Ni0.17Co0.17Mn0.66O2 has been fabricated via a co-precipitation assisted solid-phase method and further evaluated as a cathode for potassium-ion batteries for the first time. Highly reversible K+ intercalation/deintercalation is demonstrated in this material. It delivers a reversible capacity of 76.5 mAh/g with average voltage of 3.1 V and shows good cycling performance with capacity retention of 87% after 100 cycles at 20 mA/g. This work may give a new insight into developing cathode materials for potassium-ion batteries.

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