Showa Denko K.k.

Resonac Corporation

Tomonori Kurata

Mitsuru Hanasaki

Junya Uchiyashiki

Kirida Kunanuruksapong

Yasuhiro Nakagawa

Yuta Kawahara

Kentarou Takahashi

Kazunari Fukase

Shuhei Maruta

Yuma Tanaka

The present invention relates to a copolymer for a binder for a non-aqueous battery electrode, which ensures sufficient binding properties between active materials and between the active materials and a current collector, suppresses generation of aggregates in a slurry containing the electrode active material, suppresses generation of cracks in an electrode active material layer, and sufficiently ensures peel strength of the electrode active material layer against the current collector. The copolymer for a binder for a non-aqueous battery electrode is a copolymer (P) of a monomer mixture (M) containing a monomer (A) represented by general formula (1), a (meth)acrylic acid monomer (B), and a monomer (C) represented by general formula (2), wherein a content of a structure derived from the monomer (A) in the copolymer (P) is 0.5 to 20.0 mass % and a content of a structure derived from the monomer (C) in the copolymer (P) is 0.5 to 20.0 mass %.

Copolymer for binder for non-aqueous battery electrode, and slurry for producing non-aqueous battery electrode

An electrode binder for a nonaqueous secondary battery; and a nonaqueous secondary battery electrode. The electrode binder for a nonaqueous secondary battery contains a resin component and is water-soluble. The surface free energy γat 23° C. is 70 mJ/mor less, and the dipole component γof the surface free energy is 26 mJ/mor less.

Electrode binder for a nonaqueous secondary battery and nonaqueous secondary battery electrode

A binder for a nonaqueous battery electrode, the nonaqueous battery electrode using the binder for the nonaqueous battery electrode, and a nonaqueous battery. The binder for a nonaqueous battery electrode contains a copolymer (P) of an ethylenically unsaturated monomer (A) essentially containing a styrene-based monomer (a1) and a (meth)acrylate ester (a2), and a surfactant (B1) having an ethylenically unsaturated bond, wherein the total amount of structure units derived from the surfactant (B1) having the ethylenically unsaturated bond in the copolymer (P) and the surfactant (B2) not contained in the copolymer (P) is 0.10 to 1.00 parts by mass based on 100 parts by mass of the copolymer (P). Also disclosed is a method for producing the binder.

Binder including copolymer of styrene, (meth)acrylate, and surfactant having unsaturated bond, slurry having the same, nonaqueous battery electrode using the same, and nonaqueous battery using the same

The invention relates to a method for producing a slurry for a nonaqueous battery electrode, a method for producing a nonaqueous battery electrode, and a method for producing a nonaqueous battery. The method for producing a slurry for a nonaqueous battery electrode includes a dispersing step of dispersing a conductive auxiliary agent in an aqueous binder composition, and a mixing step of mixing the conductive auxiliary agent-containing binder composition obtained in the dispersing step with an active material. In the conductive auxiliary agent-containing binder composition, a particle diameter at which particles begin to appear, which is measured according to a degree of dispersion by a grain gauge method, is 90 &#x3bc;m or less.

Method for producing slurry for nonaqueous battery electrodes

An aqueous binder composition for a secondary battery electrode containing a silane coupling agent without ethylenically unsaturated bonds, a resin which is a polymer of at least one kind of ethylenically unsaturated monomers, a resin which is a polymer of at least one kind of ethylenically unsaturated monomer, and at least one kind of solvent selected from water and a hydrophilic solvent. The amount of silane coupling agent is from 0.5 to 9 parts by mass based on 100 parts by mass of ethylenically unsaturated monomer. The pH of the composition is 2.5 to 8.0. Also disclosed is a binder obtained by curing the aqueous binder composition, a slurry containing the aqueous binder composition and an active material, a secondary battery electrode obtained by curing the slurry, and a secondary battery including the secondary battery electrode.

Aqueous binder composition for secondary battery electrode, slurry for secondary battery electrode, binder, secondary battery electrode, and secondary battery

A binder composition for nonaqueous battery electrodes essentially contains (A) an ethylenically unsaturated monomer and (B) a surfactant, and further satisfies any two or more conditions of the following (I) to (III): (I) (A) the ethylenically unsaturated monomer includes (a) a phosphoric acid group-containing ethylenically unsaturated monomer; (II) (B) the surfactant comprises (b) a phosphoric acid group-containing surfactant; and (III) the composition including (C) a neutralizing agent containing an alkali metal compound and/or an alkali earth metal compound.

Composition for binder for non-aqueous cell electrode, binder for non-aqueous cell electrode, composition for non-aqueous cell electrode, non-aqueous cell electrode, and non-aqueous cell

A binder composition for nonaqueous battery electrodes is prepared by adding a small amount of an acetylene glycol compound to an aqueous polymer emulsion obtained by emulsion polymerization of a monomer mixture comprising from 15 to 70% by mass of styrene (a), from 20 to 80% by mass of an ethylenically unsaturated carboxylate (b), from 1 to 10% by mass of an ethylenically unsaturated carboxylic acid (c), from 0.1 to 5% by mass of a crosslinkable ethylenically unsaturated monomer (d), and from 0 to 20% by mass of another monoethylenically unsaturated monomer (e). When the above binder composition is used, an active material is not peeled off in the step of cutting a collector even when a small amount of the binder is used, and a nonaqueous battery excellent in a charge-discharge cycle property can be produced.

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Tatsuno, Japan

Tomonori Kurata