Abstract: The disclosure aims to provide a fluororesin for use in electrochemical device binders which enables formation of an electrode mixture sheet with high strength, and an electrochemical device binder, an electrode mixture, an electrode, and a secondary battery. Provided is a fluororesin for use in electrochemical device binders, the fluororesin including a tetrafluoroethylene unit and a hexafluoropropylene unit and being expandable.

Abstract: The disclosure aims to provide a fluororesin for use in electrochemical device binders which enables formation of an electrode mixture sheet with high strength, and an electrochemical device binder, an electrode mixture, an electrode, and a secondary battery. Provided is a fluororesin for use in electrochemical device binders, the fluororesin including a tetrafluoroethylene unit and a chlorotrifluoroethylene unit.

Abstract: The disclosure aims to provide a polytetrafluoroethylene for use in electrochemical device binders which enables formation of an electrode mixture sheet with high strength, and an electrochemical device binder, an electrode mixture, an electrode, and a secondary battery. Provided is a polytetrafluoroethylene for use in electrochemical device binders, the polytetrafluoroethylene having a number average molecular weight of 3.0×106 or more.

Abstract: The present disclosure provides a fluororesin film for a battery exterior body, which is excellent in adhesion to a metal layer. The present disclosure further provides a battery exterior body which is excellent in electrolytic solution permeation resistance. The fluororesin film for the battery exterior body includes a composition including a fluororesin. An oxygen element ratio of a surface of the film after heating the film at 180° C. during 3 minutes is 1.35 atomic % or more. The oxygen element ratio is obtained by measuring a surface state of one or both surfaces of the film by a scanning X-ray photoelectron spectrometer (XPS/ESCA). An absolute value of a rate of dimensional change of the film in MD and TD, measured before and after heating the film at 180° C. during 10 minutes and then cooling down the film to 25° C., is 2% or less.

Abstract: Provided is a fluororesin film with high uniformity in adhesion strength of the film. A fluororesin film that is a film comprising a fluororesin-containing composition, wherein at least one surface of the fluororesin film has an average value of contact angles for water measured at 5 points with intervals of 100 mm in a travel direction of 105° or less and an average value of contact angles for n-hexadecane measured at 5 points with intervals of 100 mm in the travel direction of 45° or less at locations of center and 100 mm from respective left and right ends.

Abstract: A surface-treating agent for an electrode material includes a pyridine skeleton and fluorine. A positive electrode active material, a current collector foil, a negative electrode active material, each treated with the surface-treating agent, an electrode, and a battery, are provided. A method for producing a positive electrode active material, a method for producing a current collector foil, a method for producing a negative electrode active material, a method for producing a conductive aid, and a method for producing an electrode which are capable of improving the cycle characteristics of batteries and preventing or reducing corrosion of current collector foils, are provided.

Abstract: A binder and a slurry suitable for use in the production of an electrode in a sulfide-based solid-state battery. The binder contains sulfide-based solid electrolyte particles, and is a fluorine-containing elastomer in which resin end functional groups satisfy: 0.01?([—CH2OH]+[—COOH])/([—CH3]+[—CF2H]+[—CH2OH]+[—CH2I]+[—OC(O)RH]+[—COOH]?0.25 wherein R represents an alkyl group with 1 to 20 carbon atoms. Also disclosed is an electrode including an electrode active material layer formed using the slurry and a lithium-ion secondary solid state battery including the electrode.

Abstract: A laminate, including a fluororesin sheet; and a base material. The fluororesin sheet including a fluororesin composition containing: a melt moldable fluororesin; and a silica. The fluororesin is a tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer and/or a tetrafluoroethylene-hexafluoropropylene copolymer having 25 or more carbonyl group-containing functional groups per 106 main-chain carbon atoms; the silica is a spherical silica; a blending ratio of the spherical silica to a total amount of the fluororesin and the silica is 50% by mass or higher and 70% by mass or lower; the fluororesin composition has a linear expansion coefficient of 100 ppm/° C. or lower and a melt flow rate (MFR) of 1.0 g/10 min or higher and 30 g/10 min or lower. Also disclosed is a substrate for circuits including the fluororesin sheet used as a part in a multilayer structure.

Abstract: Provided are an electrolytic solution that can allow a secondary battery comprising a silicon negative electrode to be improved in life and suppressed in an increase in resistance, and a secondary battery using the electrolytic solution. An electrolytic solution for use in a battery comprising an electrode having a negative electrode material containing a silicon element and a carbon element, wherein the electrolytic solution comprises less than 10% by mass of a fluorinated ether represented by the following general formula (1): HCF2CF2—O—R (1), wherein R is a fluorinated alkyl group.

Abstract: A binder and a slurry suitable for use in the production of an electrode in a sulfide-based solid-state battery. The binder contains sulfide-based solid electrolyte particles, and is a fluorine-containing elastomer in which resin end functional groups satisfy: 0.01?([—CH2OH]+[—COOH])/([—CH3]+[—CF2H]+[—CH2OH]+[—CH2I]+[—OC(O)RH]+[—COOH]?0.25 where R represents an alkyl group with 1 to 20 carbon atoms. Also disclosed is an electrode including an electrode active material layer formed using the slurry and a lithium-ion secondary solid state battery including the electrode.

Abstract: The present disclosure provides a secondary battery mixture that has good properties, a secondary battery mixture sheet containing the mixture, and a secondary battery using the secondary battery sheet. The secondary battery mixture contains a positive electrode active material and a binder, wherein the positive electrode active material is a lithium-nickel-based composite oxide, and the binder is a polytetrafluoroethylene resin.

Abstract: The present disclosure provides a secondary battery mixture containing a sulfide-based electrolyte that has good properties, a secondary battery mixture sheet containing the secondary battery mixture, and a solid-state secondary battery using the secondary battery mixture sheet. The secondary battery mixture includes a sulfide-based solid-state electrolyte and a binder, wherein the binder is a fibrillatable resin. The binder preferably has a fibrous structure with a fibril diameter (median value) of 100 nm or less.

Abstract: The present disclosure provides a secondary battery mixture containing an oxide-based electrolyte that has good properties, a secondary battery mixture sheet containing the mixture, and a solid-state secondary battery using the secondary battery mixture sheet. In addition, the present disclosure provides a method for producing a secondary battery mixture sheet that contains a binder having a fine fiber structure. The secondary battery mixture contains an oxide-based solid-state electrolyte and a binder, wherein the binder is a fibrillatable resin. The fibrillatable resin preferably has a fibrous structure with a fibril diameter (median value) of 100 nm or less.

Abstract: Provided is a secondary battery mixture that has good properties, a secondary battery mixture sheet containing the mixture, and a secondary battery using the secondary battery sheet. The secondary battery mixture contains a solid-state electrolyte and/or electrode active material, and a binder, wherein the binder is a fibrillatable resin having a fibrous structure with a maximum fibril diameter of 90 nm or more.

Abstract: The present disclosure provides a secondary battery mixture that has good properties, a secondary battery mixture sheet containing the mixture, and a secondary battery using the secondary battery mixture sheet. The secondary battery mixture contains a solid-state electrolyte and/or electrode active material, and a binder, wherein the binder is a fibrillatable resin having a fibrous structure with a fibril diameter (median value) of 100 nm or less, and is contained in the secondary battery mixture in an amount of 0.3% by mass or more and 8% by mass or less.

Abstract: Provided is a negative electrode mixture containing a single-walled carbon nanotube, a negative electrode active material, and a binder, in which the negative electrode mixture contains, as the negative electrode active material, a negative electrode active material that exhibits a potential of 2.5 V or less vs. Li when alloyed with Li or bonded with Li, and the binder contains a fluorine-containing copolymer containing vinylidene fluoride unit and a unit of an other monomer other than vinylidene fluoride.

Abstract: Provided is a composition for an electrochemical device, containing a single-walled carbon nanotube, a binder, and a solvent, wherein the binder comprises a fluorine-containing copolymer comprising a repeating unit (a) based on vinylidene fluoride, and at least one repeating unit (b) selected from the group consisting of a repeating unit (b1) and a repeating unit (b2).

Abstract: Provided is a composition, comprising single-walled carbon nanotube, a binder, and a specific solvent, wherein the binder contains a fluorine-containing polymer containing a vinylidene fluoride unit.

Abstract: Provided is a composition for an electrochemical device, comprising a nanocarbon material, a binder, and a solvent, wherein the nanocarbon material is at least one selected from the group consisting of a multi-walled carbon nanotube, a carbon nanohorn, a carbon nanofiber, a fullerene, and a graphene, and the binder comprises a fluorine-containing copolymer comprising a repeating unit (a) based on vinylidene fluoride and at least one repeating unit (b) selected from the group consisting of a repeating unit (b1) and a repeating unit (b2).

Abstract: Provided are a production apparatus and a production method capable of producing an electrode industrially by an efficient method. A mixture sheet production apparatus for an electrochemical device includes a stacking mechanism that stacks two or more mixture sheets containing a binder resin and a press-fusing mechanism that is provided downstream of the stacking mechanism and that integrates the stacked mixture sheets by applying pressure.