LITHIUM ION SECONDARY BATTERY

WIPO Patent Application WO/2012/033036

A1

Provided is a lithium ion secondary battery with which it is possible to guarantee safety during a battery malfunction and prevent a reduction in high-performance discharge characteristics. The lithium ion secondary battery (1) has an electrode group (5) in which a positive-pole plate (2), which is a current collector where a positive-pole mix containing a positive-pole active substance has been formed, and a negative-pole plate (3), which is a current collector where a negative-pole mix containing a negative-pole active substance has been formed, are wound with a porous separator (4) therebetween. A flame retardant is added to the positive-pole mix of the positive-pole plate (2), and the mode of the diameter of pores formed in the positive-pole mix as determined by a mercury porosimeter is within the range of 0.5 to 2.0 µm. A path for lithium ion movement and a path for electron movement during discharge are simultaneously guaranteed.

TSUJIKAWA TOMONOBU (JP)
ARAKAWA MASAYASU (JP)
MIYAMOTO YOSHIKI (JP)
HAYASHI KOJI (JP)
NAKAHARA MASAKI (JP)

PCT/JP2011/070124

March 15, 2012

September 05, 2011

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NTT FACILITIES INC (JP)
SHIN KOBE ELECTRIC MACHINERY (JP)
TSUJIKAWA TOMONOBU (JP)
ARAKAWA MASAYASU (JP)
MIYAMOTO YOSHIKI (JP)
HAYASHI KOJI (JP)
NAKAHARA MASAKI (JP)

H01M4/131; H01M4/505; H01M4/62; H01M10/052; H01M10/0568

JP2009016106A	2009-01-22
JPH05151971A	1993-06-18
JP2009004139A	2009-01-08
JP2003173821A	2003-06-20
JPH09180709A	1997-07-11
JP2006286571A	2006-10-19
JP2009016106A	2009-01-22

JOURNAL OF ELECTROCHEMICAL SOCIETY, vol. 149, no. 5, 2002, pages A622 - A626
See also references of EP 2615670A4

IGARASHI, TOSHIAKI (JP)
Toshiaki Igarashi (JP)

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