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Layered transition-metal oxides have attracted intensive interest for cathode materials of sodium-ion batteries. However, they are hindered by the limited capacity and inferior phase transition due to the gliding of transition-metal layers upon Na +  extraction and insertion in the cathode materials. Here, we report that the large-sized K +  is riveted in the prismatic Na +  sites of P2-Na 0.612 K 0.056 MnO 2  to enable more thermodynamically favorable Na +  vacancies. The Mn-O bonds are reinforced to reduce phase transition during charge and discharge. 0.901 Na +  per formula are reversibly extracted and inserted, in which only the two-phase transition of P2 ↔ P’2 occurs at low voltages. It exhibits the highest specific capacity of 240.5 mAh g −1  and energy density of 654 Wh kg −1  based on the redox of Mn 3+ /Mn 4+ , and a capacity retention of 98.2% after 100 cycles. This investigation will shed lights on the tuneable chemical environments of transition-metal oxides for advanced cathode materials and promote the development of sodium-ion batteries.

Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery