Abstract
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°C had disordered Ni3Sn2, disordered NiO, amorphous SnOx and crystalline SnO2 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°C (641 mAh g–1)>600°C (573 mAh g–1)>800°C (559 mAh g–1), and their initial coulomb efficiencies were ranked by preparation temperature: 700°C (60%)>600°C (58%)>800°C (55%). The excellent specific discharge capacity and cycle retention of the sample prepared at 700°C were attributed to the formation of Ni3Sn2 intermetallic compounds, the buffering role of the CNF, and the good distribution of active particles by electrospinning.
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