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

Chenchen Wang, Luojia Liu, Shuo Zhao, Yanchen Liu, Yubo Yang, Haijun Yu, Suwon Lee, Gi-Hyeok Lee, Yong-Mook Kang, Rong Liu, Fujun Li () and Jun Chen
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Chenchen Wang: Nankai University
Luojia Liu: Nankai University
Shuo Zhao: Nankai University
Yanchen Liu: Nankai University
Yubo Yang: Beijing University of Technology
Haijun Yu: Beijing University of Technology
Suwon Lee: Korea University
Gi-Hyeok Lee: Dongguk University
Yong-Mook Kang: Korea University
Rong Liu: Western Sydney University, Locked 17 Bag 1797
Fujun Li: Nankai University
Jun Chen: Nankai University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-22523-3

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