Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer – spacer or materials for use therewith
Reexamination Certificate
2003-08-26
2008-05-20
Kalafut, Stephen J. (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer, spacer or materials for use therewith
C429S252000, C429S254000, C428S220000, C374S057000
Reexamination Certificate
active
07374843
ABSTRACT:
The invention relates to a microporous membrane, which is provided with high safety even under a condition that the interior temperature of a battery becomes high, and which has high permeability and high mechanical strength at the same time.The polyolefin microporous membrane is characterized by a membrane thickness of 5 to 50 μm, a void content of 30 to 60%, a gas transmission rate of 40 to 300 sec/100 cc/20 μm, a piercing strength of not less than 2.5 N/20 μm and a break through temperature of not lower than 110° C.The separator in accordance with the present invention is used to exhibit high safety under a high temperature condition as well as high permeability, and therefore it is particularly useful as a separator for miniaturized high capacity batteries of a non-aqueous electrolytic solution type.
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Computer-generated English translation of JP 11-322989, from the Japanese Patent Office website (doc date Nov. 1999).
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Adachi Masayuki
Ikemoto Takashi
Sogo Hiroshi
Asahi Kasei Chemicals Corporations
Kalafut Stephen J.
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