Email the author Forming a Stable Amorphous Phase in the Carbon-Coated Silicon upon Deep Electrochemical Lithiation
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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Copyright (©) 2010 S.P. Kuksenko, I.O. Kovalenko, Yu.А. Tarasenko, N.Т. Кartel
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