Journal
ELECTROCHEMICAL AND SOLID STATE LETTERS
Volume 12, Issue 9, Pages A190-A193Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3158060
Keywords
decomposition; electrochemical electrodes; grain growth; intercalation compounds; iron alloys; lithium; nanostructured materials; nickel alloys; secondary cells; tin alloys; X-ray diffraction
Funding
- U. S. Department of Energy [DE-AC0205CH11231]
- Korean Government [KRF-2008-357-D00065]
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Sn-Ni-Fe-C composite anodes have been synthesized by a mechanochemical reaction of Sn with Ni-C and Fe-C composites and characterized. The Sn-Ni-Fe-C composite consisting of nanostructured Sn4Ni3, Sn2Fe, and SnFe along with carbon exhibits excellent capacity retention with a capacity of over 400 mAh/g. X-ray diffraction characterization of the electrodes reveals that while Sn2Fe decomposes completely during the lithiation process, both Sn4Ni3 and SnFe decompose only partially. The enhanced capacity retention of Sn-Ni-Fe-C compared to that of Sn is attributed to the buffering effect provided by Sn4Ni3 and SnFe and their effectiveness in suppressing the Sn grain growth during cycling.
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