期刊
ENERGY STORAGE MATERIALS
卷 15, 期 -, 页码 1-7出版社
ELSEVIER
DOI: 10.1016/j.ensm.2018.03.007
关键词
Sodium batteries; Cathode materials; Tunnel structure; Anion doping; X-ray Absorption spectroscopy
资金
- NSFC [51502039]
- 1000 Youth Talents Plan
- U.S. Department of Energy, the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies through Advanced Battery Material Research (BMR) program [DE-SC0012704]
- U.S. Department of Energy, Basic Energy Science [DE-AC02-06CH11357]
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[Mn0.66Ti0.34]O2-xFx (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[Mn0.66Ti0.34]O1.94F0.06 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[Mn0.66Ti0.34]O1.94F0.06 exhibits superior low temperature performance, owing to the much enhanced thermodynamics and kinetics benefited from F doping. 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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