Abstract: An object of the present invention is to provide composite particles capable of suppressing oxidation over time of a Si—C composite material. Composite particles (B) of the present invention contains composite particles (A) containing carbon and silicon; and amorphous layers coating surfaces thereof, where the composite particles (B) have ISi/IG of 0.10 or more and 0.65 or less, and have R value (ID/IG) of 1.00 or more and 1.30 or less, when a peak due to silicon is present at 450 to 495 cm?1, an intensity of the peak is defined as ISi, an intensity of a G band (peak intensity in the vicinity of 1600 cm?1) is defined as IG, and an intensity of a D band (peak intensity in the vicinity of 1360 cm?1) is defined as ID in a Raman spectrum, and where the composite particles (B) have a full width at half maximum of a peak of a 111 plane of Si of 3.0 deg. or more using a Cu-K? ray in an XRD pattern.

Abstract: A current collector for electrical storage device includes a sheet-shaped conductive substrate and a coating layer disposed on one or both sides of the conductive substrate. The coating layer includes a powdery carbon material, acid-modified polyvinylidene fluoride and polyvinylpyrrolidone. The content of the polyvinylpyrrolidone is 0.099 to 5.0 mass %. The content of the powdery carbon material in the coating layer is 15.0 to 45.0 mass %. Also disclosed is a coating liquid for producing the current collector for electrical storage device as well as a method for producing the current collector for electrical storage device.

Abstract: A current collector for electrical storage device includes a sheet-shaped conductive substrate and a coating layer disposed on one or both sides of the conductive substrate. The coating layer includes a powdery carbon material, acid-modified polyvinylidene fluoride and polyvinylpyrrolidone. The content of the polyvinylpyrrolidone is 0.099 to 5.0 mass %. The content of the powdery carbon material in the coating layer is 15.0 to 45.0 mass %. Also disclosed is a coating liquid for producing the current collector for electrical storage device as well as a method for producing the current collector for electrical storage device.

Abstract: An electrode current collector including a metal foil wherein a coating layer is formed on one or both surfaces of the metal foil, and a contact angle with pure water of the surface of the coating layer at a side opposite to the metal foil side is 30° or more.

Abstract: A current collector wherein Layer a comprising electrically conductive particles such as electrically conductive carbon; a binding agent such as chitosan, chitin and the like; and organic acid such as trimellitic anhydride, pyromellitic anhydride, 1,2,3,4-butanetetracarboxylic acid and the like is provided on one or both surfaces of a metal foil such as an aluminum foil, a copper foil and the like, and the coverage of the electrically conductive particles is 50 to 100%, and the thickness of the Layer a is 5 ?m or less. An electrode wherein Layer b comprising an electrode active material is provided on a surface having the Layer a of the current collector. An electrochemical element comprising the electrode.

Abstract: A coating solution comprising (A) water or a mixed solvent of water and an organic solvent, (B) an electrical conducting material, and (C) at least one selected from the group consisting of polysaccharides and polysaccharide derivatives as essential components, and (D) at least one selected from the group consisting of a polybasic organic acid and a polybasic organic acid derivative as an optional component, wherein mass WB of the component (B), mass WC of the component (C) and mass WD of the component (D) satisfy a relationship of 0.5?WB/(WC+WD)?5. An electric collector comprising an electrically-conductive substrate, and an undercoat layer formed on one or both surfaces of the electrically-conductive substrate, wherein the undercoat layer is formed by applying a coating solution comprising (A) water or a mixed solvent of water and an organic solvent, and (B) an electrical conducting material, and the electric collector is 100 milliohm or less in a penetration resistance value measured at 25 deg C.