To provide a copper foil satisfying following conditions required for a current collector of a lithium ion secondary battery: the surface roughness of both faces of the copper foil of 2.5-10 μm; Young's modulus after heat treatment at 300°C of 48-80 GPa; and the tensile strength of 300 MPa or more.
The electrolytic copper foil for the lithium ion secondary battery, having coarse surface roughness Rz of the electrolytic copper foil of 2.5-10 μm; tensile strength in ordinary state of ≥680 MPa; Young's modulus of 55-90 GPA; Young's modulus after heating at 300°C for 1 hour of 48-80 GPa, is made into a foil by using sulfuric acid/copper sulfate aqueous solution as electrolysis solution, and adding one kind from hydroxyethylcellulose (HEC), polypropylene glycol (PPG) or polyethylene glycol (PEG), polyethylene imine (PEI) and 3-mercaptopropylsulfonic acid (MPS) or bis(3-sulfopropyl)disulfide (SPS) and chlorine ion.
JP2004339558A | 2004-12-02 | |||
JP2010018885A | 2010-01-28 | |||
JP2008010320A | 2008-01-17 |
WO2010110205A1 | 2010-09-30 |
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