Abstract: An electrode for all-solid-state secondary batteries which enables the achievement of a practicable all-solid-state secondary battery even if an electrode active material layer does not contain a solid electrolyte which has been an essential ingredient for conventional electrodes for all-solid-state secondary batteries; and a practicable all-solid-state secondary battery which uses an electrode in which an electrode active material layer does not contain a solid electrolyte. The all-solid-state secondary battery includes a positive electrode, a solid electrolyte layer and a negative electrode, the positive electrode and/or the negative electrode has an electrode active material layer on a collector, the electrode active material layer contains an electrode active material and a binder resin; the binder resin contains a polyimide resin; and the electrode active material layer does not contain a solid electrolyte, while containing a lithium salt that has a solubility of 0.

Abstract: An electrode binder resin composition containing a polyamic acid, a water-soluble polymer other than the polyamic acid, and a solvent. The use of the electrode binder resin composition improves cyclic characteristics.

Abstract: A power storage device including a negative electrode active material layer which contains carbon particles, silicon-based particles and a polyimide-based binder, in which the negative electrode active material layer has a porosity of more than 40%. The power storage device has a high charge/discharge capacity and excellent cycle characteristics.

Abstract: This power storage device uses a negative electrode active material layer which contains a negative electrode active material containing silicon-based particles and a polyimide-based binder, wherein the negative electrode active material layer has a porosity of less than 20%. This power storage device has a high charge/discharge capacity and excellent cycle characteristics.

Abstract: A method for producing an aqueous polyimide precursor solution includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in water without organic solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

Abstract: A method for producing an aqueous polyimide precursor solution composition includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in an aqueous solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

Abstract: A method for producing an aqueous polyimide precursor solution composition includes reacting a tetracarboxylic dianhydride and a diamine in the presence of an imidazole, using water as a reaction solvent to provide an aqueous polyimide precursor solution composition. The polyamic acid and the imidazole are dissolved in the water. A concentration of the polyamic acid is 5 to 45 wt %, The imidazole is an imidazole having two or more alkyl groups as substituents. An amount of the imidazole is 1.6 moles or more per mole of the tetracarboxylic dianhydride, and a concentration of the imidazole compound based on a sum of the imidazole compound and the water is 9.47 wt % or less. The diamine component includes a diamine having a solubility in water at 25° C. of 0.1 g/L or more.

Abstract: A polyimide-based binder for power storage device having a repeated breaking energy retention ratio of 70% or more. The use of the binder enables improvement of a power storage device having a high capacity.

Abstract: An electrode binder resin composition containing a polyamic acid, a water-soluble polymer other than the polyamic acid, and a solvent. The use of the electrode binder resin composition improves cyclic characteristics.

Abstract: An electrode for an all-solid secondary battery, including an electrode active material layer comprising an electrode active material and a binder resin on a current collector, the binder resin including a polyimide resin, and the electrode active material layer does not contain an electrolyte; and an all-solid secondary battery, including the electrode as a positive electrode or a negative electrode.

Abstract: A polyimide precursor resin composition for forming a flexible device substrate, including a polyamic acid having a structure obtained from a tetracarboxylic acid component including at least one of 3,3?,4,4?-biphenyltetracarboxylic dianhydride and pyromellitic dianhydride, a diamine component including at least one of paraphenylene diamine and 4,4?-diaminodiphenyl ether, and a carboxylic acid monoanhydride, the polyamic acid satisfying equations (1) and (2) below: 0.97?X/Y<1.00??Equation (1) 0.5?(Z/2)/(Y?X)?1.05??Equation (2) in which X represents a number of moles of tetracarboxylic acid component, Y represents a number of moles of diamine component, and Z represents a number of moles of the carboxylic acid monoanhydride.

Abstract: A method for producing an aqueous polyimide precursor solution includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in water without organic solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

Abstract: A method for producing an aqueous polyimide precursor solution composition includes reacting a tetracarboxylic dianhydride and a diamine in the presence of an imidazole, using water as a reaction solvent to provide an aqueous polyimide precursor solution composition. The polyamic acid and the imidazole are dissolved in the water. A concentration of the polyamic acid is 5 to 45 wt %, The imidazole is an imidazole having two or more alkyl groups as substituents. An amount of the imidazole is 1.6 moles or more per mole of the tetracarboxylic dianhydride, and a concentration of the imidazole compound based on a sum of the imidazole compound and the water is 9.47 wt % or less. The diamine component includes a diamine having a solubility in water at 25° C. of 0.

Abstract: A method for producing an aqueous polyimide precursor solution composition includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in an aqueous solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

Abstract: A binder resin for electrodes consisting of a polyimide-based resin having a melting point of 300° C. or lower, an electrode mixture paste including the binder resin for electrodes, an electrode active material, and a solvent; and an electrode including an electrode mixture layer including the binder resin for electrodes and an electrode active material; and a method for producing the electrode.

Abstract: Disclosed is a method for manufacturing an electrode by forming an electrode mixture layer on a surface of a current collector using an electrode mixture composition containing an aqueous polyimide precursor solution composition and a specific crosslinking agent, the aqueous polyimide precursor solution composition being obtained by dissolving a specific polyamide acid in an aqueous solvent together with a specific imidazole, and subsequently performing heat treatment to remove the solvent and perform an imidization reaction of the polyamide acid. It is preferable that the imidazole is an imidazole selected from the group consisting of 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 4-ethyl-2-methylimidazole, and 1-methyl-4-ethylimidazole.

Abstract: Disclosed is a method for producing a polyimide laminate, the method including the steps of applying a polyimide precursor solution onto a substrate and heating the polyimide precursor solution, to thereby form a polyimide film layer on the substrate. The substrate is any plate selected from a glass plate, a metal plate, and a ceramic plate. The heating step includes irradiation with far infrared rays using an infrared heater that generates a maximum radiant energy at an infrared wavelength of 3.5 to 6 ?m. The highest heating temperature is preferably 350 to 550° C. The time required to increase the temperature from 180 to 280° C. during a temperature-increasing process is preferably 2 minutes or longer.

Abstract: Provided are a polyimide binder for energy storage device capable of improving properties of an energy storage device in a broad temperature range, and an electrode sheet and an energy storage device using the same. The polyimide binder for energy storage device, which is a polyimide obtained by subjecting an aqueous solution of a polyamic acid composed of a repeating unit represented by the following general formula (I) to an imidization reaction, the polyimide having a tensile elastic modulus of 1.5 GPa or more and 2.7 GPa or less. In the formula, A is a tetravalent group resulting from eliminating a carboxyl group from a specified tetracarboxylic acid, and B is a divalent group resulting from eliminating an amino group from a specified diamine, provided that 55 mol % or more of B in a total amount of the repeating unit is the divalent group resulting from eliminating an amino group from an aliphatic diamine having a molecular weight of 500 or less.

Abstract: A polyimide film including a polyimide obtained by polymerizing a tetracarboxylic acid component and a diamine component. The tetracarboxylic acid component consists of one or more tetracarboxylic dianhydride (a1), in which at least one of the bonds linking the two cyclic anhydride structures contained in the molecule is a freely rotatable bond and a phthalic anhydride structure is not contained therein, and one or more tetracarboxylic dianhydride (a2) having an alicyclic structure, in which each of two cyclic anhydride structures shares at least one carbon-carbon bond with the alicyclic structure and a freely rotatable bond is not contained in the molecule; and the diamine component includes one or more diamine having a 9,9-diphenylfluorene structure in an amount of 5 to 50 mol %.

Abstract: Disclosed is a method for manufacturing an electrode by forming an electrode mixture layer on a surface of a current collector using an electrode mixture composition containing an aqueous polyimide precursor solution composition and a specific crosslinking agent, the aqueous polyimide precursor solution composition being obtained by dissolving a specific polyamide acid in an aqueous solvent together with a specific imidazole, and subsequently performing heat treatment to remove the solvent and perform an imidization reaction of the polyamide acid. It is preferable that the imidazole is an imidazole selected from the group consisting of 1,2-dimethylimidazole, 2-ethyl-4-methylimidazole, 4-ethyl-2-methylimidazole, and 1-methyl-4-ethylimidazole.