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

Journal Article · · Nature Communications
 [1];  [2];  [2];  [2];  [3];  [3];  [4];  [5];  [4];  [6];  [2];  [2]
  1. 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
  2. Nankai Univ., Tianjin (China). College of Chemistry. Renewable Energy Conversion and Storage Center (RECAST). Key Lab. of Advanced Energy Materials Chemistry (Ministry of Education)
  3. Beijing Univ. of Technology, Beijing (China). College of Materials Science and Engineering
  4. Korea Univ., Seoul, (Korea, Republic of). Dept. of Materials Science and Engineering
  5. 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)
  6. 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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