Abstract: A method of producing an electrode includes: (a) forming an active material layer; and (b) forming a groove on a surface of the active material layer by laser processing of the surface of the active material layer. In the laser processing, a pulsed laser having a pulse width of 200 ns or less is used; an ambient pressure is 980 hPa or more; and assist gas has a flow rate of 5 m/s or less.

Abstract: An electrode plate manufacturing apparatus includes: a first roll; a second roll that consolidates a particle aggregate and forms an undried active material film; and a third roll that transcribes the undried active material film on the second roll onto a current collector foil. A circumferential velocity A of the first roll, a circumferential velocity B of the second roll, a conveyance velocity C of the current collector foil, a contact angle ? of the first roll, a contact angle ? of the second roll, and a contact angle ? of the current collector foil satisfy conditions (i) ?????1.6×B/A+40 where ???>0 and B/A?1 and (ii) ?????1.6×C/B+40 where ???>0 and C/B?1.

Abstract: A manufacturing method of a lithium ion secondary battery includes: forming a first mixture by mixing powder of a first electrode material, which is one of the active material and the conductive material, with powder of trilithium phosphate; forming a second mixture by mixing the first mixture with powder of a second electrode material which is the other one of the active material and the conductive material; forming a wet granulated body by mixing the second mixture with the binder and a solvent; and forming the active material layer by attaching the wet granulated body to the surface of the current collector foil.

Abstract: An electrode production method by which an electrode including an electrode active material layer formed on a surface of a current collecting member is produced includes, when a material having a lower bulk density between an electrode active material and a conductive material is used as a first substance and a material having a higher bulk density is used as a second substance, wetting the first substance with a solvent to prepare a wet substance, performing first mixing in which the wet substance and the second substance are mixed to prepare a preceding mixture, and performing second mixing in which the preceding mixture, a binder, and the solvent are mixed and granulated to prepare a wet granulated substance.

Abstract: An electrode plate manufacturing apparatus includes: a first roll; a second roll that consolidates a particle aggregate and forms an undried active material film; and a third roll that transcribes the undried active material film on the second roll onto a current collector foil. A circumferential velocity A of the first roll, a circumferential velocity B of the second roll, a conveyance velocity C of the current collector foil, a contact angle ? of the first roll, a contact angle ? of the second roll, and a contact angle ? of the current collector foil satisfy conditions (i) ?????1.6×B/A+40 where ???>0 and B/A?1 and (ii) ?????1.6×C/B+40 where ???>0 and C/B?1.

Abstract: An electrode production method by which an electrode including an electrode active material layer formed on a surface of a current collecting member is produced includes, when a material having a lower bulk density between an electrode active material and a conductive material is used as a first substance and a material having a higher bulk density is used as a second substance, wetting the first substance with a solvent to prepare a wet substance, performing first mixing in which the wet substance and the second substance are mixed to prepare a preceding mixture, and performing second mixing in which the preceding mixture, a binder, and the solvent are mixed and granulated to prepare a wet granulated substance.

Abstract: A method of producing a negative electrode plate includes mixing a negative electrode mixture material containing a negative electrode active material and a binding material with a solvent and forming a wet granulated body and rolling the wet granulated body to pass through a gap between a pair of rolls, molding the body in a sheet form, and adhering the body to a surface of a negative electrode current collecting foil. Moreover, when the wet granulated body is formed, a powder whose average particle size X ?m and tap density Y g/cm3 satisfy Y?0.0139X+0.4386 is used as a powder of the negative electrode active material.

Abstract: A manufacturing method of a lithium ion secondary battery includes: forming a first mixture by mixing powder of a first electrode material, which is one of the active material and the conductive material, with powder of trilithium phosphate; forming a second mixture by mixing the first mixture with powder of a second electrode material which is the other one of the active material and the conductive material; forming a wet granulated body by mixing the second mixture with the binder and a solvent; and forming the active material layer by attaching the wet granulated body to the surface of the current collector foil.

Abstract: A positive electrode paste for a non-aqueous electrolyte secondary battery is provided. The positive electrode paste includes a binder and a positive electrode active material. The binder includes a resin including polyvinyl acetal as a basic skeleton, the resin having a weight average molecular weight of 50000 to 140000 and having a hydroxyl group content of 42 to 60 mol %; and polyvinylidene fluoride having a weight average molecular weight of 800000 to 1200000.

Abstract: A positive electrode paste for a non-aqueous electrolyte secondary battery is provided. The positive electrode paste includes a binder and a positive electrode active material. The binder includes a resin including polyvinyl acetal as a basic skeleton, the resin having a weight average molecular weight of 50000 to 140000 and having a hydroxyl group content of 42 to 60 mol %; and polyvinylidene fluoride having a weight average molecular weight of 800000 to 1200000.

Abstract: Disclosed is a technique capable of minimizing defects, such as pinholes, in an electrode. A negative electrode forming step includes a mixture preparing step for preparing a paste-like negative electrode mixture containing a negative electrode active material, and an applying step for applying the electrode mixture onto the surface of a sheet-like negative electrode current collector. The mixture preparing step includes the step for adding a solvent to a thickener in powder form and the negative electrode active material. The thickener is carboxymethyl cellulose having a maximum particle size equal to or less than 1/4 of the thickness of the electrode mixture applied onto the negative electrode current collector in the applying step.