Yu. E. Roginskayaa, T. L. Kulovab, A. M. Skundinb, M. A. Bruka, A. V. Klochikhinaa,
N. V. Kozlovaa, V. A. Kal’novc, and B. A. Loginovd
a Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064 Russia
b Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 117071 Russia
c Physicotechnological Institute, Russian Academy of Sciences, Moscow, Russia
d Moscow Institute of Electronic Engineering (Technical University), Moscow, Russia
e-mail: rogin@cc.nifhi.ac.ru
Received January 31, 2008
Abstract—The results obtained in studies of the structure and electrochemical properties of film electrodes
prepared by magnetron plasma sputtering of silicon and graphite and working under the conditions of lithium
injection and extraction are generalized. Composite silicon-carbon electrodes synthesized by depositing silicon
and carbon nanolayers with the use of a magnetron plasma were films 100–500 nm thick. Part of them exhibited
highly uniform nanogranular structure based on a carbon matrix with inserted silicon clusters of size below 6
nm. The nanogranular structure of Si/C composites was observed for the first time; such a morphology was not
characteristic of not structured silicon layers deposited under equal conditions. The factors that determined the
electrochemical charging-discharging behavior of new composites were the degree of uniformity of the nan-
ogranular structure, the ratio between the silicon and carbon components, and film thickness. For two thin films,
the initial composite capacitance was higher than that corresponding to the Li4.4Si stoichiometry for the silicon
component and LiC6 stoichiometry for the carbon component, which was related to the special nanostructured
state of silicon and carbon. The effects (luminescence band and absorption bands in the visible range) charac-
teristic of nanosized silicon particles were observed.
DOI: 10.1134/S0036024408100063
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