期刊
NANO LETTERS
卷 14, 期 3, 页码 1255-1262出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl404165c
关键词
Antimony; nanocrystals; synthesis; Li-ion; Na-ion; batteries
类别
资金
- Swiss National Science Foundation [200021_1402.45]
- Swiss Federal Commission for Technology and Innovation (CTI) [14698.2 PFIW-IW]
- European Union through the FP7 (ERC) [306733]
We report colloidal synthesis of antimony (Sb) nanocrystals with mean size tunable in the 10-20 nm range and with narrow size distributions of 7-11%. In comparison to microcrystalline Sb, 10 and 20 nm Sb nanocrystals exhibit enhanced rate-capability and higher cycling stability as anode materials in rechargeable Li-ion and Na-ion batteries. All three particle sizes of Sb possess high and similar Li-ion and Na-ion charge storage capacities of 580-640 mAh g(-1) at moderate charging/discharging current densities of 0.5-1C (1C-rate is 660 mA g(-1)). At all C-rates (0.5-20C, e.g. current densities of 0.33-13.2 Ag1-), capacities of 20 nm Sb particles are systematically better than for both 10 nm and bulk Sb. At 20C-rates, retention of charge storage capacities by 10 and 20 nm Sb nanocrystals can reach 78-85% of the low-rate value, indicating that rate capability of Sb nanostructures can be comparable to the best Li-ion intercalation anodes and is so far unprecedented for Na-ion storage.
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