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Abstract
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-Na0.612K0.056MnO2 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 Mn3+/Mn4+, 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.
High-capacity and structural stable cathode materials are challenges for sodium-ion batteries. Here, the authors report a layered P2-Na0.612K0.056MnO2 with large-sized K+ riveted in the Na-layers to enable 0.9 Na+ (de)insertion with a reversible phase transition of P2-P’2.
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1 Nankai University, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Tianjin, China (GRID:grid.216938.7) (ISNI:0000 0000 9878 7032)
2 Beijing University of Technology, College of Materials Science and Engineering, Beijing, China (GRID:grid.28703.3e) (ISNI:0000 0000 9040 3743)
3 Korea University, Department of Materials Science and Engineering, Seoul, Republic of Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678)
4 Dongguk University, Department of Materials Science and Engineering, Seoul, Republic of Korea (GRID:grid.255168.d) (ISNI:0000 0001 0671 5021); Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, USA (GRID:grid.184769.5) (ISNI:0000 0001 2231 4551)
5 Western Sydney University, Locked 17 Bag 1797, Secondary Ion Mass Spectrometry Facility, Penrith, Australia (GRID:grid.1029.a) (ISNI:0000 0000 9939 5719)