Toagosei Company, Ltd.

Tomoko Nakano

Naohiko Saito

Ayano Higasayama

Hideo Matsuzaki

A secondary battery electrode binder that exhibits superior binding capacity. The present invention also provides a secondary battery electrode mixture layer composition, a secondary battery electrode, and a secondary battery that are obtained using the binder. The present invention relates to a secondary battery electrode binder that contains a carboxyl-group-containing polymer or a salt of a carboxyl-group-containing polymer. The carboxyl-group-containing polymer or salt of a carboxyl-group-containing polymer includes structural units that are derived from monomers that are represented by general formula (1) and structural units that are derived from ethylenic unsaturated carboxylic acid monomers that are different from general formula (1). The structural units derived from monomers that are represented by general formula (1) are 0.1-20 mass % of the total structural units of the carboxyl-group-containing polymer or salt of a carboxyl-group-containing polymer.

Secondary battery electrode binder, secondary battery electrode mixture layer composition, secondary battery electrode and secondary battery

A binder is for a secondary battery electrode and exhibits high binding properties in an electrode mixture layer and is capable of exhibiting superior cycle characteristics than before. This binder for a secondary battery electrode includes a cross-linked polymer or salt thereof, and the cross-linked polymer or salt thereof has a sol fraction of 5.0 mass % or more and 40 mass % or less. The cross-linked polymer or salt thereof may contain 50 mass % or more and 100 mass % or less of structural units derived from an ethylenic unsaturated carboxylic acid monomer.

Binder for a secondary battery electrode and use thereof

A binder for a nonaqueous electrolyte secondary battery electrode and use thereof are described. The binder contains a crosslinked polymer or salt thereof, the crosslinked polymer having an ethylenically unsaturated carboxylic acid and a crosslinkable monomer in constituent monomers thereof, or salt thereof, wherein the crosslinked polymer includes the ethylenically unsaturated carboxylic acid in an amount of 20 to 99.95 mass % of the total constituent monomers, and the crosslinked polymer includes at least one compound selected from the group made of trimethylolpropane diallyl ether and trimethylolpropane triallyl ether as the crosslinkable monomer.

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Nagoya, Japan

Tomoko Nakano