Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 4, Issue 11, Pages 893-897Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1388-2481(02)00483-6
Keywords
lithium batteries; carbon-coated silicon anode; in situ XRD
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The structural changes of graphite-mixed and carbon-coated silicon, used as lithium intercalation materials, have been studied during discharge-charge using synchrotron-based in situ X-ray diffraction. The lithium intercalation (de-intercalation) takes place in the graphite first during discharge (charge), and then in the silicon. This graphite-lithium buffer combined with the uniformly distributed carbon coating greatly improve the quality and morphology of the Li-Si alloys formed at the surface of silicon powders. Therefore, the superior specific capacity and cycling performance are obtained for the graphite-mixed and carbon-coated silicon materials. (C) 2002 Elsevier Science B.V. All rights reserved.
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