Reduced curl battery separator and method

Details Reduced curl battery separator and method Reduced curl battery separator and method

H - Electricity

01

M

H01M 2/16 (2006.01) C08J 7/04 (2006.01) D06M 15/05 (2006.01) D06N 3/02 (2006.01) H01M 2/14 (2006.01)

Patent

CA 2252143

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 °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/m2.

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