A facile carbothermal preparation of Sn-Co-C composite electrodes for Li-ion batteries using low-cost carbons

作者：Nacimiento Francisco; Lavela Pedro^*; Tirado Jose Luis; Miguel Jimenez Mateos Juan

来源：Journal of Solid State Electrochemistry, 2012, 16(3): 953-962.

DOI：10.1007/s10008-011-1469-6

Sn-Co-C composites were prepared by carbothermal reaction of ball-milled precursors. X-ray diffraction and Sn-119 Mossbauer spectroscopy of the original composites revealed the predominance of Sn and CoSn2 phases for those samples prepared with a high Sn/Co ratio. Electron microscopy images showed a homogeneous dispersion of sub-micrometric metallic particles in the carbon matrix. Galvanostatic cycling at several kinetic rates revealed that Sn7Co1C92 and Sn8Co4C88 are able to maintain 400 mA h g(-1) after 40 cycles at 35 mA g(-1). The large CoSn2 contribution revealed by Mossbauer spectroscopy in the original and cycled electrodes is responsible for the good electrochemical performance. This interpretation is also supported by impedance spectroscopy measurements.

• 出版日期2012-3