Method for producing an electrode sheet

A method for producing an electrode sheet including a current collecting foil having a surface on which an electrode mixture layer is provided, the method comprising:

• heating, before pressing, the electrode sheet including the current collecting foil and the electrode mixture layer formed of composite particles composed of active material particles and binder particles to soften or melt the binder particles contained in the electrode mixture layer, in which each of the binder particles has a smaller diameter than each of the active material particles so that a plurality of the binder particles bind to a surface of each of the active material particles;
• and
• roll-pressing the heated electrode sheet in the heating between a first roll and a second roll to compress the electrode mixture layer in a thickness direction, so that the active material particles are bonded to each other and the electrode mixture layer is bonded to the surface of the current collecting foil through the softened or melted binder particles,
• wherein the roll-pressing includes pressing the electrode sheet by setting a temperature of an outer peripheral surface of the first roll with which an outer surface of the electrode mixture layer of the electrode sheet contacts lower than a temperature of an outer peripheral surface of the second roll, so that an adhesive strength of the binder particles in the electrode mixture layer to the first roll is reduced lower than an adhesive strength to the current collecting foil.