A laminated electric core for a lithium-ion battery includes a first current collecting substrate; a first electrode active material layer coated or adhered on an inner surface of the first current collecting substrate; a second current collecting substrate; a second electrode active material layer coated or adhered on an inner surface of the second current collecting substrate; a separator sandwiched between the first electrode active material layer and the second electrode active material layer, wherein an electrolyte is retained at least in the separator; and an adhesive layer between the first electrode active material layer and the separator.