4.5 micrometer electrolytic copper foil for lithium ion battery, preparation method and additive

Abstract

The invention discloses 4.5 micrometer electrolytic copper foil for a lithium ion battery, a preparation method and an additive. The 4.5 micrometer electrolytic copper foil is prepared from polyquaternium-10, polyquaternium-7, polyquaternium-51, dithiobis-1-propanesulfonic acid disodium salt, sodium alcohol mercaptan sulfonate, gelatin, alkaline safranine dye, N-butyl thiourea, mercaptoimidazole sodium benzenesulfonate and polyethylene glycol acetal. The 4.5 micrometer electrolytic copper foil for the lithium ion battery, the preparation method and the additive have the beneficial effects thatby means of the coupling reaction of the additive, nucleating surface energy is reduced, the growth speed of crystal nuclei is restrained, pinholes and micro-defects are removed, the nucleating quantity is increased, grains are refined, the structure of the copper coil is homogenized, and the tensile strength and the ductility are effectively improved; and industrialization of the copper foil which has the tensile strength of 35-40 kgf / mm<2> and the uniform double-face structure (Rz of the smooth and rough faces is 1.0-2.0 micrometers) and is free of defects and ultrathin (the thickness is 4.5 micrometers) is achieved, and industrialization of high-energy-density power battery copper foil products is effectively achieved.

Description

technical field [0001] The invention relates to the technical field of electrolytic copper foil preparation, in particular to a 4.5 μm electrolytic copper foil for lithium ion batteries, a preparation method and additives. 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. Low ≤ 350N / mm2, low elongation ≤ 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, and the service life of the battery is shortened. Faults are prone to occur during discharge. Because 4.5μm copper foil is thinner, defects are easier to enlarge, so the ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing 4.5 μm electrolytic copper foil for lithium-ion batteries has high requirements for additives, and the additives used in the existing 5 μm and above double-sided photoelectrolytic copper foil cannot meet the performance requirements. Therefore, a kind of 4.5 μm electrolytic copper foil for lithium ion battery, preparation method and additive

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