Laminate and method of producing laminate, and secondary sheet and method of producing same

A method of producing a laminate comprising:

• shaping a composition containing a resin and a particulate carbon material with a content of the particulate carbon material being 50% by mass or less into a sheet by pressure application to provide a primary sheet having a tensile strength of 1.5 MPa or less;
• and
• obtaining a laminate comprising two or more layers formed either by stacking a plurality of the primary sheets on top of each other or by folding or rolling the primary sheet.

A secondary sheet comprising a resin and a particulate carbon material with a content of the particulate carbon material being 50% by mass or less such that the particulate carbon material is aligned in a thickness direction of the secondary sheet, wherein

• the secondary sheet has a curl index of 0.33 or less, where the curl index is obtained by, when the secondary sheet is formed into a square of 50 mm×50 mm, a 65 g weight of 55 mm×55 mm is placed on a flat surface thereof for 10 seconds, and the weight is then removed, dividing a curl height by 50 mm, which is the length of one side of the secondary sheet, where the curl height is measured in millimeters from the flat surface in a direction perpendicular to the flat surface.