Separator film for a storage battery

Details Separator film for a storage battery Separator film for a storage battery

1997-01-21

1998-11-03

Bell, Bruce F.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

429254, 204296, H01M 216

Patent

active

058306030

ABSTRACT:
A separator film for a battery is formed as a hydrophilized porous biaxially oriented film. The porous biaxially oriented film has a porosity of at least about 70%, a thickness in the range of about 10 to about 500 .mu.m, and a pore size in the range of about 0.01 to about 20 .mu.m. The porous film is made of hydrophobic resin, and a hydrophilic high polymer which is fixed in the pores of the film. The hydrophilic high polymer may be heterogeneously distributed in the porous film, so that the separator film has a hydrophilic portion and a hydrophobic portion. The porosity and/or the pore size of the porous film can be varied in the direction of film thickness. The separator film is applied in an alkaline storage battery or a nonaqueous electrolyte battery such as a lithium battery.

REFERENCES:
patent: 5094895 (1992-03-01), Branca et al.
patent: 5100723 (1992-03-01), Iwasaki et al.
patent: 5591542 (1997-01-01), Sakamoto et al.

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