Porous film and secondary battery electrode
AssigneeZeon Corporation
InventorsMayumi Fukumine, Yasuhiro Wakizaka
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Abstract
The present invention is intended for providing a porous film having excellent film uniformity, and is capable to contribute for improving cyclic and rate properties, which is provided on a surface of electrode used for a secondary battery and the like. The porous film of the present invention is characterized by including water soluble polymer having an average polymerization degree of 500 to 2500, an inorganic filler and water soluble particulate polymer. In the present invention particularly, it is preferable that said water soluble polymer is thickening polysaccharides, further said water-insoluble polymer is preferably selected from the group consisting of semisynthetic cellulose polymer, sodium salt and ammonium salt thereof.
Claims19
A porous film comprising;
- water soluble polymer having an average polymerization degree of 500 to 2500,
- an inorganic filler and
- water insoluble particulate polymer, wherein
- said water soluble polymer is selected from the group consisting of cellulose base semisynthetic polymers, sodium salts of cellulose base semisynthetic polymers, and ammonium salts of cellulose base semisynthetic polymers,
- said water soluble polymer has a degree of etherification of 0.5 to 1.0, and
- said water insoluble particulate polymer contains at least one cross-linking group selected from the group consisting of an epoxy group, a hydroxyl group, an N-methylol amide group, and an oxazoline group.
A slurry for porous film comprising:
- water soluble polymer having an average polymerization degree of 500 to 2500,
- an inorganic filler and
- water insoluble particulate polymer, and
- dispersion medium, wherein
- said water soluble polymer is selected from the group consisting of cellulose base semisynthetic polymers, sodium salts of cellulose base semisynthetic polymers, and ammonium salts of cellulose base semisynthetic polymers,
- said water soluble polymer has a degree of etherification of 0.5 to 1.0, and
- said water insoluble particulate polymer contains at least one cross-linking group selected from the group consisting of an epoxy group, a hydroxyl group, an N-methylol amide group, and an oxazoline group.
A porous film comprising;
- water soluble polymer having an average polymerization degree of 500 to 2500,
- an inorganic filler and
- water insoluble particulate polymer, wherein
- said water soluble polymer is selected from the group consisting of cellulose base semisynthetic polymers, sodium salts of cellulose base semisynthetic polymers, and ammonium salts of cellulose base semisynthetic polymers,
- said water soluble polymer has a degree of etherification of 0.5 to 1.0, and
- said water insoluble particulate polymer contains at least one cross-linking group selected from the group consisting of an epoxy group, a hydroxyl group, an N-methylol amide group, and an oxazoline group;
- wherein an average particle diameter of said inorganic filler is 0.1 to 5 μm;
- wherein an average particle diameter of the water-insoluble particulate polymer is 0.01 to 0.5 μm;
- and
- wherein the water-insoluble particulate polymer is an acrylic flexible polymer.
Dependencies are inferred from the claim text.