Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 6, Pages A644-A652Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3560433
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Funding
- MEST [2010-0027661]
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The Ni and Sn-embedded carbon nanofiber (Ni-Sn/CNF) nanocomposites as anode materials were prepared by using electrospinning technique and optimum thermal process. The fine structure of Ni-Sn/CNF was scrutinized by EXAFS. The nanocomposite prepared at 700 degrees C had disordered Ni(3)Sn(2), disordered NiO, amorphous SnO(x) and crystalline SnO(2) phases created as tiny particles in the carbon nanofibers (CNF). The 100th discharge capacity of Ni-Sn/CNFs were ranked as follows by their preparation temperature: 700 degrees C (641 mAh g(-1))>600 degrees C (573 mAh g(-1))> 800 degrees C (559 mAh g(-1)), and their initial coulomb efficiencies were ranked by preparation temperature: 700 degrees C (60%)>600 degrees C (58%)>800 degrees C (55%). The excellent specific discharge capacity and cycle retention of the sample prepared at 700 degrees C were attributed to the formation of Ni(3)Sn(2) intermetallic compounds, the buffering role of the CNF, and the good distribution of active particles by electrospinning. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3560433]
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