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Title:
POWDER FOR NEGATIVE ELECTRODE MATERIAL OF LITHIUM-ION RECHARGEABLE BATTERY ELECTRODE, AND METHOD OF PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/148569
Kind Code:
A1
Abstract:
Disclosed are a powder for the negative electrode material of a lithium-ion rechargeable battery having a silicon-rich layer on the surface of a low-grade silicon oxide powder, and a powder for the negative electrode material of a lithium-ion rechargeable battery comprising a silicon oxide powder. The powder for the negative electrode material of a lithium-ion rechargeable battery is characterized in that c/d <1, where c is the value of the molar ratio of oxygen to silicon on the surface of the silicon oxide powder, and d is the value of the molar ratio of the total oxygen to silicon. Preferably, c < 1 and/or 0.8 < d < 1.0. In addition, preferably: the surface of the powder does not contain crystalline silicon; the inside of the powder is amorphous; and there is a conductive carbon film on the surface. The surface of the powder for the negative electrode material of a lithium-ion rechargeable battery is coated with silicon using disproportionation of SiClx (X <4). A powder for the negative electrode material of a lithium-ion rechargeable battery, which can be used in a lithium-ion rechargeable battery having a large reversible capacity and a small irreversible capacity, and a method of producing a powder for the negative electrode material of a lithium-ion rechargeable battery can thus be provided.

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Inventors:
KANNO HIDEAKI (JP)
SHIMOSAKI SHINJI (JP)
TAKEMURA KAZUO (JP)
Application Number:
PCT/JP2011/002466
Publication Date:
December 01, 2011
Filing Date:
April 27, 2011
Export Citation:
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Assignee:
OSAKA TITANIUM TECHNOLOGIES CO (JP)
KANNO HIDEAKI (JP)
SHIMOSAKI SHINJI (JP)
TAKEMURA KAZUO (JP)
International Classes:
H01M4/48; C01B33/02; C01B33/113; H01M4/36
Foreign References:
JP2010272411A2010-12-02
JP2009259723A2009-11-05
JP2009104892A2009-05-14
JP2005085717A2005-03-31
JP2997741B22000-01-11
Attorney, Agent or Firm:
MORI, Michio et al. (JP)
Woods Michio (JP)
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