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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 18, 2008
Accepted December 30, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Electrochemical characteristics of amophous carbon coated silicon electrodes

Oleg Mikhalovich Vovk Byung-Ki Na¹ Byung Won Cho² Joong Kee Lee^2†

Institute for Single Crystals, National Academy of Sciences of Ukraine, 60, Lenin avenue, Kharkiv, 61001, Ukraine ¹Department of Chemical Engineering, Chungbuk National University, 12 Gaeshin-dong, Heungduk-gu, Chungbuk 361-763, Korea ²Advanced Energy Materials processing laboratory, Battery Research Center, Korea Institute of Science and Technology, Cheongnyang, Seoul 130-650, Korea

leejk@kist.re.kr

Korean Journal of Chemical Engineering, July 2009, 26(4), 1034-1039(6), 10.1007/s11814-009-0172-0

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Abstract

The properties of carbon films deposited by the radio frequency plasma sputtering of a fullerene C60 target were investigated to elucidate the dependence on the plasma power. A radio frequency argon plasma power ranging from 50 to 300W at a pressure of 1.3 Pa was applied for sputtering. This corresponds to a self-bias potential on the target ranging from .95 to .250 V and a maximum argon ion energy ranging from 240 to 575 eV. The analysis of the G and D peaks in the Raman spectra shows that the films are similar to tetragonal hydrogenated amorphous carbon annealed at 600-1,000 ℃. The electron band structure of the carbon films deposited by the sputtering of C60 depends on the plasma power. The coating effect of these carbon films on the capacity performance of the silicon film electrode of lithium secondary batteries was significant in our experimental range. An electrochemical test revealed that such carbon thin film on the silicon electrode plays an important role in mitigating the capacity fading during the charge and discharge processes. The test revealed that the film formed at a plasma power of 300 W is the most effective.

Keywords

Fullerene C60 Carbon Film r.f. Plasma Sputtering UV-Vis Spectra Raman Spectra Anode of Lithium Secondary Batteries

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