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.

Details

Title
Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery
Author
Wang, Chenchen 1 ; Liu Luojia 1 ; Zhao, Shuo 1 ; Liu Yanchen 1 ; Yang, Yubo 2 ; Yu, Haijun 2   VIAFID ORCID Logo  ; Lee, Suwon 3 ; Lee, Gi-Hyeok 4 ; Yong-Mook, Kang 3 ; Liu, Rong 5 ; Li, Fujun 1   VIAFID ORCID Logo  ; Chen, Jun 1   VIAFID ORCID Logo 

 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) 
 Beijing University of Technology, College of Materials Science and Engineering, Beijing, China (GRID:grid.28703.3e) (ISNI:0000 0000 9040 3743) 
 Korea University, Department of Materials Science and Engineering, Seoul, Republic of Korea (GRID:grid.222754.4) (ISNI:0000 0001 0840 2678) 
 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) 
 Western Sydney University, Locked 17 Bag 1797, Secondary Ion Mass Spectrometry Facility, Penrith, Australia (GRID:grid.1029.a) (ISNI:0000 0000 9939 5719) 
Publication year
2021
Publication date
2021
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2513091479
Copyright
© The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.