Zeon Corporation

Mayumi Fukumine

Yasuhiro Wakizaka

Norikazu Yamamoto

Fumiaki Tsuchiya

Masahiro Yamakawa

Kei Kobayashi

Hidekazu Mori

Keiichiro Tanaka

Tomoya Murase

Takumi Sugimoto

Mitsuhiro Mori

Yoshio Fukumine

Arinobu Katada

Jun Mikami

Junpei Motoki

Keita Tokura

Maki Katagiri

Ken Oh

Provided is a paste for a secondary battery that can cause an electrode mixed material layer to display excellent adhesiveness and can reduce internal resistance of a secondary battery. The paste for a secondary battery contains a conductive additive, a polymer, and a dispersion medium. The conductive additive includes one or more carbon nanotubes having a surface acid content of not less than 0.01 mmol/g and not more than 0.15 mmol/g, a surface base content of not less than 0.005 mmol/g and not more than 0.500 mmol/g, a ratio of the surface acid content relative to the surface base content of not less than 1.3 and not more than 3.0, and a specific surface area of 150 m/g or more.

Paste for secondary battery, slurry for secondary battery positive electrode, positive electrode for secondary battery, secondary battery, and method of producing paste for secondary battery

Provided is a binder composition for a non-aqueous secondary battery positive electrode that can form a positive electrode with which it is possible to obtain a non-aqueous secondary battery having excellent life characteristics even when aging treatment is carried out under low-temperature and low-depth of charge conditions. The binder composition contains a first binder, iron, and at least one of ruthenium and rhodium. The total iron, ruthenium, and rhodium content is no greater than 5&#xd7;10parts by mass per 100 parts by mass of the first binder.

Binder composition for non-aqueous secondary battery positive electrode, composition for non-aqueous secondary battery positive electrode, positive electrode for non-aqueous secondary battery, and non-aqueous secondary battery, and methods for producing composition for non-aqueous secondary battery positive electrode, positive electrode for non-aqueous secondary battery, and non-aqueous secondary battery

Provided are a binder composition for a secondary battery electrode that enables favorable dispersion of a conductive material when used in production of a slurry composition for a secondary battery electrode, and a slurry composition for a secondary battery electrode in which a conductive material is favorably dispersed. The binder composition for a secondary battery electrode contains a solvent and a copolymer including an alkylene structural unit and a nitrile group-containing monomer unit. The copolymer has a Mooney viscosity (ML, 100&#xb0; C.) of 40 or less. The slurry composition for a secondary battery electrode contains an electrode active material, a conductive material, the aforementioned binder composition for a secondary battery electrode, and a polymer other than the aforementioned copolymer.

Binder composition for secondary battery electrode, conductive material paste composition for secondary battery electrode, slurry composition for secondary battery electrode, electrode for secondary battery, and secondary battery

Provided is a binder composition for a lithium ion secondary battery positive electrode that can suppress expansion of a positive electrode. The disclosed binder composition for a lithium ion secondary battery positive electrode includes a copolymer containing a nitrile group-containing monomer unit and a conjugated diene monomer unit and a solvent. A degree of swelling in electrolysis solution of the copolymer is at least 200 mass % and no greater than 700 mass % and a storage elastic modulus of a binder coating obtained through film formation of the binder composition is at least 1&#xd7;10and no greater than 1&#xd7;10Pa.

Binder composition for lithium ion secondary battery positive electrode, slurry composition for lithium ion secondary battery positive electrode, positive electrode for lithium ion secondary battery and lithium ion secondary battery

Provided is a binder composition for secondary battery electrode-use that has high binding capacity, and that is capable of suppressing corrosion of a current collector and an increase in internal resistance when used in production of a secondary battery. The binder composition for secondary battery electrode-use contains a copolymer and a dispersion medium. The copolymer includes at least 5 mass % and no greater than 80 mass % of a constitutional unit represented by formula (I) and at least 5 mass % and no greater than 90 mass % of a constitutional unit represented by formula (II).

Binder composition for secondary battery electrode-use, slurry composition for secondary battery electrode-use, electrode for secondary battery-use, and secondary battery

A positive electrode for a secondary battery wherein the electrode includes a collector and a positive electrode active material layer which is stacked upon the collector, and which includes a positive electrode active material, a conductive agent, and a binder; the binder includes a first polymer and a second polymer; the first polymer is a fluorine-containing polymer; the second polymer includes a polymerized moiety having a nitrile group, a polymerized moiety having a hydrophilic group, a polymerized (meth)acrylic acid ester moiety, and a straight-chain polymerized alkylene moiety having a carbon number of at least 4; the proportion of the first polymer and the second polymer in the binder, expressed as a mass ratio, is in the range of 95:5 to 5:95.

Positive electrode for secondary battery, and secondary battery

Provided are a binder composition which has high electrolyte resistance characteristics, and a secondary battery which uses a positive electrode using the binder composition for high-temperature cycle characteristics. [Solution] The binder composition for the secondary battery positive electrode according to the present invention contains a polymerized unit which contains a nitrile group; a polymerized unit of (meth) acrylic acid ester; a polymerized unit which contains a hydrophilic group; and a polymerized unit of linear alkylene having a carbon number of at least four. In a mixed solvent in which a volume ratio EC:DEC between ethylene carbonate (EC) and diethyl carbonate (DEC) at 20&#xb0; C. is 1:2, a degree of swelling with respect to an electrolyte in which LiPFis dissolved to have a concentration of 1.0 mol/L is between 100% and 500%.

Binder composition for secondary battery positive electrode, slurry composition for secondary battery positive electrode, secondary battery positive electrode, and secondary battery

Provided is a porous film that can contribute to improving the cycle characteristics of an electric cell by improving binding characteristics, for a porous film provided on a surface of an electrode used in a secondary cell and the like. The porous film comprises a water-soluble polymer, an inorganic filler, and a water-insoluble particulate polymer including 0.5-40 mass % of a monomer unit having a hydrophilic group selected from the group consisting of carboxylic acid groups, hydroxyl groups, and sulfonate groups.

Porous film and secondary battery electrode

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.

The purpose of the present invention is to provide a lithium-ion secondary battery with small internal resistance, excellent load characteristics and low reduction in capacitance due to repeated discharge and charge. The lithium-ion secondary battery of the present invention attaining the above purpose comprises a positive electrode, negative electrode and electrolyte; said positive electrode and negative electrode are configured by binding an active material layer, including an electrode active material and a binder, to a collector; the binder used for at least one of the positive electrode or negative electrode includes polymer particles; and the polymer particles satisfy the following properties:

Lithium-ion secondary battery

In regards with the porous film provided on the surface of the electrode used for the secondary battery or so, the present invention provides the porous film which can contribute to reduce the adhered material to the roll during the roll winding of the electrode. The secondary battery electrode formed by adhering; the porous film comprising the inorganic filler and the binder, and styrene and the polymer having the glass transition temperature of 15&#xb0; C. or less as said binder, the porous film slurry comprising the inorganic filler, the polymer having the glass transition temperature of 15&#xb0; C. or less and the solvent, and the electrode composite layer comprising the binder and the electrode active material, to the current collector, and said porous film is provided on the surface of the electrode composite layer.

Porous film, secondary battery electrodes, and lithium ion secondary battery

Disclosed is a composition for electrode comprising (i) a positive electrode active material comprising an iron compound and carbon, and (ii) a copolymer (P) prepared by copolymerization of acrylic acid esters and/or methacrylic acid esters, with an &#x3b1;,&#x3b2;-unsaturated nitrile compound. Also disclosed is an electrode comprised of an active material layer made of the composition for electrode, and a collector. This electrode can be produced by mixing the positive electrode active material, the copolymer (P), a solvent and an optional thickener, by a mixer to prepare an electrode composition slurry with solid content of 40-90% by weight, coating a collector with the electrode composition slurry, and then, removing the solvent from the thus-formed coating. Further disclosed a battery provided with the electrode.

Composition for electrode comprising an iron compound with carbon and a (meth)acrylate-nitrile copolymer

The present invention provides a method of producing a composite particle for high density electrochemical element electrodes in electrochemical elements having low internal resistance and high capacitance. Slurry containing an electric conductive material and a binder is obtained, and the slurry is sprayed to a fluidized electrode active material to carry out fluidized-granulation, and further particles obtained by the fluidized-granulation are rolling-fluidized granulated, and thereby, composite particle for electrochemical element electrode, containing electrode active materials, electric conductive materials, and binders, and being structured of an outer layer portion (outer shell portion) and an inner layer portion (core portion) are obtained.

Composite particles for electrochemical element electrode

The present invention provides a method of producing composite particle for high density electrochemical element electrodes in electrochemical elements having low internal resistance and high capacitance. Slurry containing an electric conductive material and a binder is obtained, and the slurry is sprayed to a fluidized electrode active material to carry out fluidized-granulation, and further particles obtained by the fluidized-granulation are rolling-fluidized granulated, and thereby, composite particle for electrochemical element electrode, containing electrode active materials, electric conductive materials, and binders, and being structured of an outer layer portion (outer shell portion) and an inner layer portion (core portion), where the outer shell portion and the core portion are made by bonding the electrode active material and the electric conductive material by the binder, and the weight average particle diameter of the electrode active material and the electric conductive material which form the outer shell portion is smaller than the weight average particle diameter of the electrode active material and the electric conductive material which form the core portion are obtained.

An electrochemical element electrode for obtaining electrochemical elements having both low internal resistance and high capacitance, and a secondary battery and an electric double layer capacitor using the electrode are provided. An electrochemical element electrode which is made by forming an active material layer on a collector, and the active material layer is formed by press-molding composite particles with high strength at moderate pressure not to crush the composite particles under pressure, while the structures of the composite particles being maintained, to bond the composite particles together, wherein the composite particles comprise an electrode active material, an electric conductive material, a dispersible binder and a soluble resin, in which the electrode active material and the electric conductive material are bonded by the dispersible binder. By use of this electrode, an electric double layer capacitor or a secondary battery is obtained.

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Tokyo, Japan

Mayumi Fukumine