Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery
Journal Article
·
· Nature Communications
- Nankai Univ., Tianjin (China). College of Chemistry. Renewable Energy Conversion and Storage Center (RECAST). Key Lab. of Advanced Energy Materials Chemistry (Ministry of Education); OSTI
- Nankai Univ., Tianjin (China). College of Chemistry. Renewable Energy Conversion and Storage Center (RECAST). Key Lab. of Advanced Energy Materials Chemistry (Ministry of Education)
- Beijing Univ. of Technology, Beijing (China). College of Materials Science and Engineering
- Korea Univ., Seoul, (Korea, Republic of). Dept. of Materials Science and Engineering
- Dongguk Univ., Seoul (Korea, Republic of). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Western Sydney Univ., Penrith, NSW (Australia). Seconday Ion Mass Spectrometry Facility
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.
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); Tianjin Natural Science Foundation; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1815939
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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