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Title: Si-O network encapsulated graphite-silicon mixtures as negative electrodes for lithium-ion batteries
Authors: Ng, S.B.
Lee, J.Y. 
Liu, Z.L.
Issue Date: 15-Feb-2001
Citation: Ng, S.B., Lee, J.Y., Liu, Z.L. (2001-02-15). Si-O network encapsulated graphite-silicon mixtures as negative electrodes for lithium-ion batteries. Journal of Power Sources 94 (1) : 63-67. ScholarBank@NUS Repository.
Abstract: Graphite-silicon mixtures are encapsulated in a Si-O network derived from sol-gel transformation of alkoxy-silane(methyl-trimethoxy-silane). The composites are characterized by powder X-ray diffraction and scanning electron microscopy. The catalyst used in the sol-gel process significantly affects the electrochemical properties of the composites. The initial specific capacity of the composites is close to 500 mA h g-1, which is between that of graphite alone (approximately 300 mA h g-1) and mechanical mixtures of graphite and silicon of identical silicon contents (approximately 900 mA h g-1). Base (NH4OH) catalyzed composites perform substantially better than acid (HCl) catalyzed composites. The experimental results have yet to demonstrate any real advantage of the composites over graphite in terms of cycleability. Nevertheless, this approach should not be dismissed as the network material in this study may not have been optimized.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/S0378-7753(00)00603-0
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