Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 24, Pages 7181-7184Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta10920h
Keywords
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Funding
- National Basic Research Program of China [2009CB220100]
- National Science Foundation of China [21173160]
- Program for New Century Excellent Talents in University [NCET-12-0419]
- National High Technology Development Program of China (863) [2012AA110102]
- independent research project of the State Grid Corporation of China
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A Sn-SnS-C nanocomposite is prepared by simply mechanically ball-milling Sn, SnS and C powders. In this composite, Sn nanocrystals are surface-coated with SnS nanoparticles and uniformly dispersed in the carbon matrix. During discharge, the SnS particles undergo an electrochemical conversion reaction to generate Sn and Na2S nanocrystals and then the Sn particles alloy with Na to produce the NaSn alloy. The conversion reaction of SnS and the alloying reaction of Sn with Na are completely reversible, producing a very high reversible Na-storage capacity of >600 mA h g(-1) at an appropriate low potential of similar to 0.7 V. Since the SnS phase provides an effective buffering matrix to alleviate the volumetric change of the Sn particles during Na insertion and extraction, and also serves as a separator to prevent the aggregation of the Sn nanoparticles, the Sn-SnS-C composite anode demonstrates a very good cycling stability with 87% capacity retention over 150 cycles, possibly usable for Na-ion batteries.
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