Silicon composite, making method, and non-aqueous electrolyte secondary cell negative electrode material

a secondary cell and electrode material technology, applied in the field of silicon composite powder, can solve the problems of poor cycle performance, low initial efficiency, low initial efficiency, etc., and achieve excellent cycle performance, alleviate a substantial volume change, and high initial efficiency inherent in silicon
US20060003227A1Inactive Publication Date: 2006-01-05SHIN ETSU CHEM IND CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SHIN ETSU CHEM IND CO LTD
Publication Date
2006-01-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A silicon composite comprises silicon particles whose surface is at least partially coated with a silicon carbide layer. It is prepared by subjecting a silicon powder to thermal CVD with an organic hydrocarbon gas and / or vapor at 900-1,400° C., and heating the powder for removing an excess free carbon layer from the surface through oxidative decomposition.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This non-provisional application claims priority under 35 U.S.C. §119(a) on patent application No. 2004-195586 filed in Japan on Jul. 1, 2004, the entire contents of which are hereby incorporated by reference. TECHNICAL FIELD

[0002] This invention relates to a silicon composite powder having a capacity controlled to compensate for the drawback of silicon which is believed useful as lithium ion secondary cell negative electrode active material; a method for preparing the same; and a non-aqueous electrolyte secondary cell negative electrode material comprising the powder. BACKGROUND ART

[0003] With the recent remarkable development of potable electronic equipment, communications equipment and the like, a strong demand for high energy density secondary batteries exists from the standpoints of economy and size and weight reductions. One prior art method for increasing the capacity of secondary batteries is to use oxides as the negative elect...

Claims

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