Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 18, Pages 6031-6036Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.03.008
Keywords
Lithium secondary battery; Anode materials; Silicon; Silicon-graphite composites; High capacity
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Two types of Si-graphite (Si-C) composites are synthesized and evaluated for anode materials of lithium secondary batteries. The mechano-chemical milling and the rotational impact blending methods are applied to synthesize two types of Si-C composites. Graphite powders having Si on the surface (type A) is synthesized by mechano-chemical milling using the pitch as a binder. Si embedded inside the graphite particle (type B) is synthesized by rotational impact blending. The loading level of Si is about 20 wt% for both type Si-C composites. The location of Si is verified by observing cross sectional images of particle and conducting EDS mapping. The initial discharge capacity of type B has larger value than that of type A, while the type A shows better cycle performance than type B. The efficiency of first cycle is about 87% for both types A and B. (C) 2010 Elsevier B.V. All rights reserved.
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