Journal
JOURNAL OF POWER SOURCES
Volume 281, Issue -, Pages 11-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.163
Keywords
Sodium-ion batteries; Copper-tin alloy anodes; Titanium carbide; Electrolyte additives
Funding
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005397]
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Cu6Sn5 alloy nanoparticles dispersed in a TiC and C conductive matrix have been developed via high energy mechanical milling (HEMM), and the resulting Cu6Sn5-TiC-C nanocomposite has been assessed as anodes for sodium-ion batteries. Composite anodes of Sn-C exhibit poor cyclic performance even with the introduction of 2 vol. % fluoroethylene carbonate (FEC) additive into the electrolyte. In contrast, Cu6Sn5-TiC-C nanocomposite anodes exhibit stable cycle life corresponding to a capacity retention of similar to 80% at 40 cycles and high-rate performance with a capacity retention of similar to 62% at 3000 mA g(-1). These superior performance metrics is ascribed to the well-developed electrochemically active nanocrystalline material (Cu6Sn5) as well as a hybrid conductive matrix (TiC and C). The incorporation of 2 vol. % FEC additive into the electrolyte further improves the performance of Cu6Sn5-TiC-C nanocomposite to display a capacity retention of similar to 94% at 250 cycles and high-rate capacity retention of similar to 82% at 5000 mA g(-1), which are attributed to the formation of a thin and stable SEI layer in presence of FEC. (C) 2015 Elsevier B.V. All rights reserved.
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