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This content will become publicly available on March 13, 2019

Title: Tunnel-structured Na 0.66[Mn 0.66Ti 0.34]O 2-xF x(x <0.1) cathode for high performance sodium-ion batteries

Sodium-ion batteries (SIBs) are attracting significant research attentions for large-scale energy storage applications. Cathode material is the vital part of SIBs to determine the capacity and cycle performance. Here, a series of F-doped Na 0.66[Mn 0.66Ti 0.34]O 2-xF x (x < 0.1) cathodes with tunnel structure are designed and synthesized aiming to enlarge the sodium diffusion paths. The lattice parameters of unit cell are tuned successfully by adjusting F doping amount. Na 0.66[Mn 0.66Ti 0.34]O 1.94F 0.06 with the optimized stoichiometry exhibits a reversible capacity of 97 mAh g -1 and promising cycle performance (85 mAh g -1 is maintained at 2C after 1000 cycles) with extremely low voltage polarization. More significantly, Na 0.66[Mn 0.66Ti 0.34]O 1.94F 0.06 exhibits superior low temperature performance, owing to the much enhanced thermodynamics and kinetics benefited from F doping. In conclusion, this strategy may open new opportunities to design advanced intercalation-type cathode materials for sodium ion batteries, especially for low-temperature applications.
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  1. Fudan Univ., Shanghai (China). Dept. of Materials Science
  2. Fudan Univ., Shanghai (China). Shanghai Key Lab. of Molecular Catalysts and Innovative Materials, Dept. of Chemistry
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
Publication Date:
Report Number(s):
Journal ID: ISSN 2405-8297
Grant/Contract Number:
SC0012704; AC02-06CH11357
Accepted Manuscript
Journal Name:
Energy Storage Materials
Additional Journal Information:
Journal Volume: 15; Journal Issue: C; Journal ID: ISSN 2405-8297
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
25 ENERGY STORAGE; Sodium batteries; Cathode materials; Tunnel structure; Anion doping; X-ray Absorption spectroscopy
OSTI Identifier: