Tunnel-structured Na_0.66[Mn_0.66Ti_0.34]O_2-xF_x(x <0.1) cathode for high performance sodium-ion batteries

Journal Article · Tue Mar 13 00:00:00 EDT 2018 · Energy Storage Materials

DOI:https://doi.org/10.1016/j.ensm.2018.03.007· OSTI ID:1434003

Wang, Qin-Chao ^[1]; Qiu, Qi-Qi ^[1]; Xiao, Na ^[1]; Fu, Zheng-Wen ^[2]; Wu, Xiao-Jing ^[1]; Yang, Xiao-Qing ^[3]; Zhou, Yong-Ning ^[1]

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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

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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
• Grant/Contract Number: AC02-06CH11357; SC0012704
• OSTI ID: 1434003
• Alternate ID(s): OSTI ID: 1430292
• Report Number(s): BNL--203519-2018-JAAM
• Journal Information: Energy Storage Materials, Journal Name: Energy Storage Materials Journal Issue: C Vol. 15; ISSN 2405-8297
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
Anion doping
Cathode materials
Sodium batteries
Tunnel structure
X-ray Absorption spectroscopy