Forming a Stable Amorphous Phase in the Carbon-Coated Silicon upon Deep Electrochemical Lithiation

Authors

  • S. P. Kuksenko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • I. O. Kovalenko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • Yu. А. Tarasenko Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine
  • N. T. Kartel Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine

Abstract

Investigation of electrochemical behaviour of the micro- and nanosilicon powders, coated with carbon by physical (mechanical milling) and chemical (pyrolysis) methods, as anodes for Li-ion batteries have been carried out. Unique role of carbon in forming a stable (noncrystalized) amorphous phase in silicon outer region upon deep lithiation has been revealed. The amorphous phase facilitates to enhancing the capacity retention and decreasing the accumulated irreversible capacity of the silicon electrodes. Carbon-coated nanosilicon composite has the reversible capacity 2029 mAh/g, first cycle efficiency 81.3% and capacity retention 90.8% after 100 cycles in the mode: cc/cv (C/2, 5 mV, C/200), cc(C/2, 1.0 V).

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Published

01.02.2010

How to Cite

(1)
Kuksenko, S. P.; Kovalenko, I. O.; Tarasenko Y. А.; Kartel, N. T. Forming a Stable Amorphous Phase in the Carbon-Coated Silicon Upon Deep Electrochemical Lithiation. Him. Fiz. Tehnol. Poverhni 2010, 1, 57-71.