期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 14, 页码 9142-9151出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01183
关键词
black anatase; oxygen vacancies; anode; sodium-ion batteries; rate performances
资金
- National Natural Science Foundation of China [21473258]
- Program for the New Century Excellent Talents in University [NCET-11-0513]
- Distinguished Young Scientists of Hunan Province [13JJ1004]
- Natural Science Foundation of Hunan [2014GK2016]
- Innovation Mover Program of Central South University [2016CX020]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2015B039]
Nanostructured black anatase titania with oxygen vacancies (OVs) is efficiently obtained and employed as an anode in sodium-ion batteries (SIBs) for the first time. The incorporation of OVs into TiO2 is demonstrated to render considerably enhanced-rate performances, higher initial capacities, and an accelerated electrochemical activation process during cycling, derived from the boosted intrinsic electric conductivity and improved kinetics of Na uptake. Bestowed with the integrated merits of OVs and shortened Na ion diffusion length in the nanostructure, black titania delivers a reversible specific capacity of 207.6 mAh g(-1) at 0.2 C, retains 99.1% over 500 cycles at 1 C stably, and still maintains 91.2 mAh g(-1) even at the high rate of 20 C. Density functional theory (DFT) calculations suggest that the lower sodiation energy barrier of anatase with OVs enables a more favorable Na intercalation into black anatase. Thus, it is of great significance to introduce OVs into TiO2 to stimulate ultrafast and durable sodium-storage properties, which also offers a potential strategy to project more superior electrodes, utilizing internal defects.
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