Specifically, the curability of a resin having curability may include curing by phase transformation (solidification) from a liquid phase (melted phase) to a solid phase, curing by removal by volatilization of a solvent, and/or curing by chemical change. Accordingly, the resin having curability may include one or two or more resins selected from the group comprising resins in the state of being dissolved in a solvent (resin solution), thermoplastic resins (resin having solidification ability by melting-solidification), photocurable resins, thermocurable resin, and chemical curable resins.
As a thermoplastic resin, any known resin which is melt (or softened) during heat application may be used. As an example, the thermoplastic resin may include a polyamide resin, a polyester resin (for example, aromatic polyester resin such as polyethylene terephthalate, and the like), a polyacetal resin, a polycarbonate resin, a polyphenylene ether resin, a polysulfide resin, a polysulfone resin, a polyether ketone resin, a polyolefin resin, a polystyrene resin, and the like, but is not limited thereto. The thermoplastic resin may be used alone or in combination of two or more.
When the adhesive layer includes the thermoplastic resin, heat is applied to the laminate which is layered so that the current collector and the active material film are in contact with each other with the adhesive layer interposed therebetween, thereby binding the active material film to the current collector by melting (or softening) and cooling of the thermoplastic resin. Here, pressure may be applied together with heat so that binding force is improved and uniform binding is formed, of course.