To provide an electrolytic solution for producing electrolytic copper foil for producing an electrolytic copper foil that has tensile strength after heat treatment at 300°C for 1 hour of 450 MPa or more and the electric conductivity of 80% or more.
An electrolytic solution for producing electrolytic copper foil is prepared by adding tungsten or tungsten compound such as tungstic acid and thiourea type compound, as necessary, chlorine ion into an electrolytic solution. A copper foil is produced by using the electrolytic solution for producing electrolytic copper foil. Thus, tungsten is taken into a copper foil and an electrolytic copper foil that has tensile strength after heat treatment at 300°C for 1 hour of 450 MPa or more and the electric conductivity of 80% or more can be produced.
SHINOZAKI KENSAKU
SUZUKI AKITOSHI
FUJISAWA KIMIKO
