NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SOLUTION SECONDARY CELL AND NONAQUEOUS ELECTROLYTE SOLUTION SECONDARY CELL USING THE SAME, AND METHOD FOR PRODUCING NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SOLUTION SECONDARY CELL

Title:

Document Type and Number:

WIPO Patent Application WO/2010/071166

Kind Code:

A1

Abstract:

Provided is a negative electrode for a nonaqueous electrolyte solution secondary cell, wherein the energy density is high when a cell is configured, and the reduction of the charge-discharge capacity is small even when charge and discharge cycles are repeated. Silicon oxide particles having a predetermined range of diameters are used as a starting material, and are heated to a temperature of 850 to 1050°C, to precipitate microcrystal silicon on the surfaces of the particles. After that, lithium is doped so that a plurality of protrusions having a predetermined range of heights and section areas are formed on the surfaces of the particles. The ratio of the average height of the protrusions with respect to the average diameter of the silicon oxide particles containing lithium ranges 2 to 19%. The obtained silicon oxide particles containing lithium are used as a negative electrode active material, to produce a negative electrode for a nonaqueous electrolyte solution secondary cell.

Inventors:

IRIYAMA JIRO (JP)
KASAHARA RYUICHI (JP)
KAJITA TETSUYA (JP)
NUMATA TATSUJI (JP)

Application Number:

PCT/JP2009/071024

Publication Date:

June 24, 2010

Filing Date:

December 17, 2009

Export Citation:

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Assignee:

NEC TOKIN CORP (JP)
IRIYAMA JIRO (JP)
KASAHARA RYUICHI (JP)
KAJITA TETSUYA (JP)
NUMATA TATSUJI (JP)

International Classes:

H01M4/131; H01M4/485; H01M4/134; H01M4/1391; H01M4/1395; H01M4/36

Foreign References:

JP2007294423A	2007-11-08
JP2006269216A	2006-10-05
JPH06325765A	1994-11-25
JP2003303586A	2003-10-24

Other References: