Preparation method of additive for electrolytic copper foil, product and application thereof

Abstract

The invention provides a preparation method of an additive for an electrolytic copper foil, which comprises the following steps of: respectively weighing thiocarbamide, polyethylene glycol, 3-(benzothiazole-2-thiol)-sodium sulfopropyl and gloss additive according to a weight percentage of 1:5:0.5:1, then heating in 3L of de-ionized water at a constant temperature of 45 DEG C, dissolving while stirring for 60min, and then diluting with water to 37L to obtain the additive for electrolyzing a copper foil. The invention also provides the` additive for the electrolytic copper foil, which is used for preparing a cathode current collector of a 6 mu lithium ion battery. For the copper foil prepared by using the additive, the rough-surface roughness Rz is less than 2 mu m, the polished-surface roughness Ra is less than 0.35 mu m, the thickness is 6+ / -1 mu m, the surface density is 57+ / -1.5g / m<2>, the hydrophilicity is more than 35, the normal-temperature tensile strength is more than 30kg / mm<2>, and the normal-temperature extensibility is more than 2%.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an additive for preparing an electrolytic copper foil of a negative electrode collector of a lithium ion battery and a preparation method thereof. Background technique [0002] As an electronic basic material, electrolytic copper foil is mainly used on printed circuit boards (PCBs). However, with the successful development of lithium-ion batteries by Sony in the early 1990s, another use of electrolytic copper foil is lithium-ion negative electrode current collectors. Lithium-ion batteries are mainly used in electronic products such as notebook computers, mobile phones, digital cameras, and MP3 players. At present, lithium batteries have gradually expanded to the fields of electric bicycles and electric vehicles. The development of new energy vehicles has been mentioned to an unprecedented height by various countries. The thickness is required to be less than 10μ to increase th...

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Problems solved by technology

[0004] Chinese patent "200710200119.3" discloses an organic additive for the preparation of electrolytic copper foil. ~3g / L, cellulose 1~5g / L, diisopropanolamine 2~10ml / L, its function is to reduce the roughness of electrolytic copper roughness, increase the crystallization density of grains, and increase the tensile strength, Peel strength, which is mainly suitable for current production above 8500A, and needs to be used in combination with complex processes and specific electrolytes, especially failing to meet the requirements for manufacturing ultra-thin electrolytic copper foil with a thickness of 6 μm

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