Zeon Corporation

Yujiro Toyoda

Hiromi Takamatsu

Takuya Kaneda

Tomokazu Sasaki

Naohiro Yasuda

Yuuki Ohkubo

Tomoya Murase

Kentaro Hayasaka

Masanori Shibuya

Natsuko Nakata

A slurry composition for non-aqueous secondary battery functional layers contains non-conductive particles, a water-soluble polymer having an average degree of polymerization of 50 or more and 450 or less, a binder, and water.

Slurry composition for non-aqueous secondary battery functional layers, non-aqueous secondary battery functional layer, and non-aqueous secondary battery

Provided is a composition for a secondary battery porous membrane having excellent redispersibility. The composition for a secondary battery porous membrane contains inorganic oxide particles X, a metal hydroxide Y, a binder, and water. The metal hydroxide Y is a divalent or trivalent hydroxide, and is contained in an amount of at least 0.001 parts by mass and not more than 10 parts by mass per 100 parts by mass of the inorganic oxide particles X.

Composition for secondary battery porous membrane, porous membrane for secondary battery, and secondary battery

Provided is a binder composition for a non-aqueous secondary battery that enables formation of a functional layer and an electrode mixed material layer having high transition metal capturing ability. The binder composition for a non-aqueous secondary battery contains a water-soluble polymer and water. The water-soluble polymer includes a sulfonate group-containing monomer unit in a proportion of at least 10 mass % and not more than 50 mass % and a (meth)acrylonitrile monomer unit in a proportion of 20 mass % or more.

Binder composition for non-aqueous secondary battery, composition for non-aqueous secondary battery functional layer, functional layer for non-aqueous secondary battery, and non-aqueous secondary battery

A composition for a non-aqueous secondary battery functional layer contains a binder and inorganic particles including a sulfonate group. A non-aqueous secondary battery includes a functional layer for a non-aqueous secondary battery that is formed using this composition for a non-aqueous secondary battery functional layer.

Composition for non-aqueous secondary battery functional layer, functional layer for non-aqueous secondary battery, and non-aqueous secondary battery

Provided is a technique for capturing transition metal ions, such as cobalt ions, in a secondary battery that elute into an electrolysis solution from a positive electrode active material. A porous membrane for a lithium ion secondary battery contains non-conductive particles and a particulate polymer. The particulate polymer includes an aliphatic conjugated diene monomer unit in a proportion of greater than 85 mass %. The cobalt concentration in a film of 500 &#x3bc;m in thickness and 12 mm in diameter, formed from the particulate polymer, after the film is immersed in a specific cobalt chloride solution for 5 days at 25&#xb0; C. is at least 300 mass ppm.

Porous membrane for lithium ion secondary battery and lithium ion secondary battery

The purpose of the present disclosure is to provide a composition for a second battery porous membrane having an excellent redispersibility. The disclosed composition for a second battery porous membrane contains &#x3b1;-alumina-based modified particles, a particulate binder and water, and each &#x3b1;-alumina-based modified particle has a peak in a region from 3500 cmto 3600 cmin an infrared diffuse reflectance spectrometry.

Composition for secondary battery porous membrane, porous membrane for secondary battery and secondary battery

Provided is a binder for a non-aqueous secondary battery that has excellent preservation stability and binding capacity, and that can suppress viscosity elevation of a slurry composition. The binder for a non-aqueous secondary battery contains a particulate polymer and water. The particulate polymer has a degree of swelling in an aqueous medium at pH 5 of less than a factor of 2 and has a degree of swelling in an aqueous medium at pH 8 of at least a factor of 2 and no greater than a factor of 7.

Binder for non-aqueous secondary battery, composition for non-aqueous secondary battery functional layer, functional layer for non-aqueous secondary battery, and non-aqueous secondary battery

A porous membrane separator for a secondary battery, comprising a separator substrate, a porous membrane formed on at least one surface of the separator substrate, and an adhesive layer formed on the porous membrane, wherein: the porous membrane contains non-conductive particles and a water-soluble maleimide-maleic acid copolymer including a specific structural unit (a) a structural unit (b); and the adhesive layer contains a particulate polymer having a glass transition temperature of 10&#xb0; C. or higher and 110&#xb0; C. or lower.

Porous membrane separator for secondary battery, method for producing the same, and secondary battery

Provided is a technique for capturing transition metal ions, such as cobalt ions, in a secondary battery that elute from a positive electrode active material and for preventing deposition of transition metal at a negative electrode. A composition for a lithium ion secondary battery porous membrane that contains non-conductive particles and a binding material is provided. The binding material includes a polymer A including an aliphatic conjugated diene monomer unit in a proportion of greater than 85 mass % and a polymer B including a (meth)acrylic acid ester monomer unit in a proportion of at least 60 mass %. A mass basis ratio of content of the polymer A relative to content of the polymer B is at least 0.2 and no greater than 9.0.

Composition for lithium ion secondary battery porous membrane, porous membrane for lithium ion secondary battery, and lithium ion secondary battery

Provided are a secondary battery separator having good heat durability, high adhesion property with the electrode active material layer formed on the current collector, and good anti-blocking property, and a secondary battery having such a secondary battery separator. The secondary battery separator of the present invention includes an organic separator layer, a heat-durable layer formed adjacent to at least one surface of the organic separator layer, and an adhesive layer formed on the heat-durable layer, wherein the heat-durable layer contains non-conductive particles and a binder, and the adhesive layer contains a particulate polymer having a glass transition temperature (Tg) of 10 to 100&#xb0; C.

Separator for secondary cell

A composition for a porous membrane of a secondary battery including a non-conductive particle and a water-soluble polymer, wherein the water-soluble polymer contains 80% by weight or more of a (meth)acrylamide monomer unit, and the water-soluble polymer has a storage modulus at 150&#xb0; C. of 2.0&#xd7;10Pa or more; and a porous membrane manufactured therefrom and a secondary battery including the same.

Secondary-battery porous membrane composition, secondary-battery porous membrane and secondary battery

To provide a method for producing an electrode/separator laminate which, when producing the electrode/separator laminate by subjecting the electrode and separator with adhesive layer to thermocompression bonding, the separator and the electrode can be bonded with adequate adhesion, without detriment to ion conductivity. [Solution] This method for producing an electrode/separator laminate includes a step in which a separator with adhesive layer comprising a porous polyolefin film having an adhesive layer at least on one side, and an electrode which has an electrode active substance layer containing an electrode active substance and an electrode binder, are laminated in such a manner that the adhesive layer and the electrode active substance layer touch one another, and are subsequently subjected to thermocompression.

Method for producing electrode/separator laminate, and lithium-ion rechargeable battery

The porous membrane according to the present invention comprises non-conductive particles, a binder, and a water-soluble polymer, and is characterized in that: the three dimensions of the non-conductive particles, namely the length (L), thickness (t), and width (b), are such that the length (L) is 0.1 to 0 &#x3bc;m, the ratio (b/t) of the width (b) and the thickness (t) is 1.5 to 100; the binder is a copolymer containing (meth)acrylonitrile monomer units and (meth)acrylic acid ester monomer units; and the water-soluble polymer contains sulfonic acid groups, and has a weight average molecular weight of 1000 to 15000. The slurry for a porous membrane according to the present invention is characterized by being formed by dispersing the non-conductive particles, the binder, and the soluble polymer, in water. Thus, the present invention provides: a porous membrane that can be formed into a thin film, has an excellent sliding property, and generates few particles; and a slurry for porous membranes which is capable of producing porous membrane easily and quickly, and has excellent storage stability.

Porous membrane for secondary battery, slurry for secondary battery porous membrane and secondary battery

Disclosed is a method for manufacturing an electrode for an electrochemical element, that is capable of forming an electrode active material layer on a current collector, particularly a perforated current collector having through-holes extended from the obverse surface to the reverse surface thereof, such as a punching metal or an expanded metal, simply, evenly and with good adhesion. The method is characterized by comprising the steps of (1) forming an electrode active material layer on a surface of a base material by using an electrode composition containing an electrode active material, an electroconductive material, and a binder, (2) laminating a current collector on the electrode active material layer formed on the surface of the base material, followed by hot pressing to bond the electrode active material layer and the current collector to each other, and (3) separating the base material from the electrode active material layer.

Growing community of inventors

Tokyo, Japan

Yujiro Toyoda