Additive for manufacturing ultrathin electrolytic copper foil

Abstract

The invention relates to an additive for manufacturing ultrathin electrolytic copper coil, which is characterized in that the additive is prepared by 300-800 milligram of acid amide, 20-40 milligram of casein, 5-10 milligram of tetrahydro-thiazoles sulfur copper, 5-10 milligram of polyethyleneglycol, and 40-50 milligram of gelatin which are added into per 10000 liter deionized water and well blended. The electrolytic copper coil with high performance ,which is manufactured by the additive and used in lithium ion batteries with high capacity, has basically consistent double sided structure, namely, double sided light copper coil; the thickness of the copper coil is thin; the actually measured thickness & is less than equal to 12micron; the crystal structure of the rough surface is uniform, smooth and compact; the metal density is close to the theoretical density of pure copper; the profile tolerance of the rough surface Rz is less than 2 micron; and the elongation is larger than 5%; the tensile strength is larger than 400N / mm2; the thickness extreme difference of the copper coil with the same mass area ratio is less than equal to 0.5 micron.

Description

technical field [0001] The invention relates to an additive required for manufacturing ultra-thin electrolytic copper foil for lithium ion batteries. Background technique [0002] At present, most of the additives used in the manufacture of ultra-thin electrolytic copper foil are gelatin, thiourea and other additives. The appearance quality and internal quality of the manufactured electrolytic copper foil products are quite different, the thickness uniformity is poor, the crystal structure is coarse and loose, and the tensile strength is low. Lower≤350N / mm 2 , the elongation rate is lower than 2%, the volume capacity of the lithium-ion battery made of copper foil made of this additive is relatively small, the internal resistance of the battery is large, the service life of the battery is shortened, and failures are prone to occur during charging and discharging . Contents of the invention [0003] The object of the present invention is to provide an additive for manufact...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the additives used in the manufacture of ultra-thin electrolytic copper foil are gelatin, thiourea and other additives. The appearance quality and internal quality of the manufactured electrolytic copper foil products are quite different, the thickness uniformity is poor, the crystal structure is coarse and loose, and the tensile strength is low. Lower≤350N / mm 2 , the elongation rate is lower than 2%, the volume capacity of the lithium-ion battery made of copper foil made of this additive is relatively small, the internal resistance of the battery is large, the service life of the battery is shortened, and failures are prone to occur during charging and discharging