Journal
NANO ENERGY
Volume 38, Issue -, Pages 350-357Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.06.014
Keywords
Sodium ion batteries; Anodes; Coulombic efficiency; Tin phosphide
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Funding
- Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0001160]
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Sodium ion batteries (SIB) have potential for large scale renewable energy storage due to geopolitical abundance of Na. However, the high capacity Na-ion anodes still suffer from poor cycling stability and low Coulombic efficiency (CE). Herein, uniform Sn4P3@C spheres were synthesized by a facile aerosol spray-pyrolysis-phosphidation method. By tuning the electrolyte, a reversible capacity of similar to 800 mAh/g with an extremely low capacity decay rate of 0.09% per cycle was achieved with a record-high initial CE (> 90%) and high cyclic CE (similar to 99.9%). The Sn4P3@C in the stable ether-based electrolyte shows the highest accumulated cycling capacities in the reported SIB anodes.
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