Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 5, Pages 1548-1551Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am100218v
Keywords
FeSn2; modified polyol process; cell performance; capacity; electrochemical activity; solid electrolyte interface
Funding
- U.S. DOE [DE-AC02-98CH10886]
- Brookhaven National Laboratory
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FeSn2, Cu6Sn5, CoSn3, and Ni3Sn4 single-crystalline nanospheres with a characteristic uniform particle size of similar to 40 nm have been synthesized via a modified polyol process, aiming at determining and understanding their intrinsic cycling performance as negative electrode materials for lithium-ion batteries. We find that, in this morphologically controlled condition, the reversible capacities follow FeSn2 > Cu6Sn5 approximate to CoSn3 > Ni3Sn4, which is not directly decided by their theoretical capacities or lithium-driven volume changes. FeSn2 exhibits the best electrochemical activity among these intermetallic nanospheres and an effective solid electrolyte interface, which explains its superior cycling performance. The small particle dimension also improves cycling stability and Li+ diffusion.
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