Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Separator – retainer – spacer or materials for use therewith
Patent
1997-12-02
1999-08-24
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Separator, retainer, spacer or materials for use therewith
429142, 429144, 429248, H01M 214
Patent
active
059423544
ABSTRACT:
A curl resistant battery separator of a noncellulosic nonwoven substrate extrusion coated on at least one surface with a cellulose film and process for making such separator by contacting a nonwoven noncellulosic textile substrate with a cellulose or cellulose derivative solution on at least one side of said substrate; converting the solution to a solid cellulose or cellulose derivative, preferably having a degree of polymerization of at least 350, more preferably at least 600, to form a coated substrate; washing said substrate in an aqueous solution; drying the coated substrate under biaxial tension to provide a battery separator having a moisture content of from about 4 to 25 wt. % based on the bone dry gauge of the separator(BDG); and then holding the separator for at least 8 hours at elevated temperatures of at least 40.degree. C. in the presence of a controlled amount of moisture to produce a separator which is stabilized against curling and has a moisture content between about 4 to 25 wt. % BDG and, preferably having a absorption rate of at least 6 mm/5 min. and a 30% KOH absorption of at least 200 g/m.sup.2.
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Danko Thomas
Oxley Jeffery Allen
Aceto Roger
Martin Angela J.
Nuzzolillo Maria
Viskase Corporation
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