Portal de Periódicos da CAPES

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

2021; Nature Portfolio; Volume: 12; Issue: 1 Linguagem: Inglês

10.1038/s41467-021-22523-3

2041-1723

Chenchen Wang, Luojia Liu, Shuo Zhao, Yanchen Liu, Yubo Yang, Haijun Yu, Suwon Lee, Gi‐Hyeok Lee, Yong‐Mook Kang, Rong Liu, Fujun Li, Jun Chen,

Supercapacitor Materials and Fabrication

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-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.