Title:
NONAQUEOUS-ELECTROLYTE SECONDARY CELL, NEGATIVE-ELECTRODE MATERIAL THEREFOR, AND PROCESS FOR PRODUCING NEGATIVE-ELECTRODE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2007/072704
Kind Code:
A1
Abstract:
A negative-electrode material (10) for nonaqueous-electrolyte secondary cells
which comprises an alloy (11) comprising silicon and a transition metal and,
formed on the surface of the alloy (11), a silicon oxide film (12) and a transition-metal oxide
film (13); a nonaqueous-electrolyte secondary cell; and a process for producing
the negative-electrode material (10) for nonaqueous-electrolyte secondary
cells. With respect to negative-electrode materials of the kind shown above
for use in nonaqueous-electrode secondary cells represented by lithium secondary
cells, investigations have been made on techniques for inhibiting the size reduction
caused by a volume change during charging. However, an investigation has not
been sufficiently made on the thicknesses of the silicon oxide film and transition-metal
oxide film. None of the conventional techniques can give a negative-electrode
material for nonaqueous-electrolyte secondary cells which has satisfactory
withstand overvoltage characteristics, which are one of important properties
required of memory-backup power supplies. In the negative-electrode material
(10) for nonaqueous-electrolyte secondary cells, the ratio of the thickness
of the transition-metal oxide film (13) to the thickness of the silicon oxide
film (12) is from 0.44 to less than 1. This constitution is intended to improve withstand
overvoltage characteristics.
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Inventors:
YAMAMOTO TERUAKI
HASEGAWA MASAKI
BITO YASUHIKO
HASEGAWA MASAKI
BITO YASUHIKO
Application Number:
PCT/JP2006/324715
Publication Date:
June 28, 2007
Filing Date:
December 12, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
YAMAMOTO TERUAKI
HASEGAWA MASAKI
BITO YASUHIKO
YAMAMOTO TERUAKI
HASEGAWA MASAKI
BITO YASUHIKO
International Classes:
H01M4/38; B22F1/16; B22F5/00; H01M4/02; H01M4/04; H01M4/36; H01M10/05
Foreign References:
| JP2005116509A | 2005-04-28 | |||
| JP2004185810A | 2004-07-02 | |||
| JP2001250540A | 2001-09-14 | |||
| JP2006066370A | 2006-03-09 |
Attorney, Agent or Firm:
IWAHASHI, Fumio et al. (1006, Oaza Kadoma, Kadoma-sh, Osaka 01, JP)
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