Binder composition for secondary battery porous membrane, slurry for secondary battery porous membrane, porous membrane for secondary battery, and secondary battery
AssigneeZeon Corporation
InventorYuuki Ohkubo
Life of this patent
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Abstract
A binder composition for a porous membrane of a secondary battery, including a polycarboxylic acid and water, wherein the polycarboxylic acid includes a carboxylic acid group-containing monomer unit in an amount of 20% by weight or more and 50% by weight or less, the polycarboxylic acid is water-insoluble at a pH of 6.5 or less and water-soluble at a pH of 8 or more, and the binder composition for a porous membrane of a secondary battery has a pH of 6.5 or less; and a slurry for a porous membrane of a secondary battery using the binder composition, a porous membrane for a secondary battery, and a secondary battery.
Claims9
A binder composition for a porous membrane of a secondary battery, comprising a polycarboxylic acid and water, wherein
- the polycarboxylic acid includes a carboxylic acid group-containing monomer unit in an amount of 20% by weight or more and 50% by weight or less,
- the binder composition for a porous membrane of a secondary battery has a pH of 6.5 or less,
- at least part of the polycarboxylic acid is dispersed in the water, and
- the polycarboxylic acid has a haze of 60% or more at a pH of 6.5 and a haze of less than 60% at a pH of 8.0, wherein the haze is obtained by measuring scattered light and total transmitted light at an optical path length of 30 mm of an aqueous solution of the polycarboxylic acid having a concentration of 10%.
A slurry for a porous membrane of a secondary battery, comprising a non-conductive particle, a polycarboxylic acid, and water, wherein
- the polycarboxylic acid includes a carboxylic acid group-containing monomer unit in an amount of 20% by weight or more and 50% by weight or less,
- the slurry for a porous membrane of a secondary battery has a pH of more than 7.0, and
- the polycarboxylic acid has a haze of 60% or more at a pH of 6.5 and a haze of less than 60% at a pH of 8.0, wherein the haze is obtained by measuring scattered light and total transmitted light at an optical path length of 30 mm of an aqueous solution of the polycarboxylic acid having a concentration of 10%.
Dependencies are inferred from the claim text.