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Additives for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, lithium ion battery

A technology of electrolytic copper foil and additives, applied in the field of electrolytic copper foil, can solve problems such as copper foil warping, copper foil folds, problems, etc., and achieve the effects of fine crystallization, uniform thickness, and low warpage

Active Publication Date: 2021-02-26
HUBEI ZHONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current mainstream electrolytic copper foil used for the negative electrode collector of lithium-ion batteries is generally 5-8 microns thick, but in the production process, copper foil warping often occurs. First, it affects the cutting quality of the copper foil; second, it is easy to cause copper Foil wrinkles; the third is that it is easy to cause cracks between the active electrode material and the copper foil when it is applied as a current collector
[0004] The warping of copper foil is generally caused by production process problems, on the one hand, it is a problem of mechanical precision; on the other hand, it is a problem of additives

Method used

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  • Additives for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, lithium ion battery
  • Additives for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, lithium ion battery
  • Additives for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, lithium ion battery

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preparation example Construction

[0069] According to a third aspect of the present invention, a method for preparing an electrolytic copper foil is provided, comprising the following steps:

[0070] adding additive A and additive B into the electrolyte, electrolytically making foil, and obtaining electrolytic copper foil;

[0071] Wherein, the copper ion content in the electrolyte is 60-120g / L, the sulfuric acid content is 80-150g / L, and the chloride ion content is 10-30ppm.

[0072] It should be noted that the electrolyte can be obtained by adding hydrochloric acid to the copper sulfate electrolyte. Among them, the temperature for preparing the electrolyte is 45-55°C, and the typical but non-limiting temperatures for preparing the electrolyte are 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 51°C, 52°C , 53°C or 55°C; the electrolyte can be effectively prepared by adjusting the temperature reasonably.

[0073] In the present invention, the electrolytic copper foil can be obtained by adding the additive A and t...

Embodiment 1

[0093] (1) Additives for electrolytic copper foil

[0094] An additive for electrolytic copper foil, including additive A and additive B.

[0095] Among them, additive A includes sodium polydithiodipropane sulfonate SPS and polyethyleneimine alkyl compound GISS, and the weight ratio of SPS and GISS is 12:6;

[0096] Additive B includes collagen Q (the average number average molecular weight of collagen Q is 1200) and carboxymethyl chitosan CC, and the weight ratio of Q and CC is 15:2.

[0097] (2) Preparation of additive aqueous solution for electrolytic copper foil

[0098] An aqueous solution of an additive for electrolytic copper foil, comprising an aqueous solution of additive A and an aqueous solution of additive B.

[0099] SPS and GISS with a weight ratio of 12:6 were dissolved in water to obtain an aqueous solution of additive A, wherein the content of SPS was 12 g / L and the content of GISS was 6 g / L.

[0100] Dissolve Q and CC at a weight ratio of 15:2 in hot water...

Embodiment 2

[0114] (1) Preparation of additive aqueous solution for electrolytic copper foil

[0115] An aqueous solution of an additive for electrolytic copper foil, comprising an aqueous solution of additive A and an aqueous solution of additive B.

[0116] SPS and GISS with a weight ratio of 13:5 were dissolved in water to obtain an aqueous solution of additive A, wherein the content of SPS was 13 g / L and the content of GISS was 5 g / L.

[0117] Q and CC with a weight ratio of 14:4 were dissolved in hot water at 50°C to obtain an aqueous solution of additive B, wherein the content of Q was 14 g / L and the content of CC was 4 g / L.

[0118] (2) Preparation method of electrolytic copper foil

[0119] A preparation method of electrolytic copper foil, comprising the following steps:

[0120] ① Preparation of electrolyte: add hydrochloric acid to copper sulfate electrolyte to obtain electrolyte, and the preparation temperature is 45°C; filter the obtained electrolyte and add it to the clean ...

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Abstract

The invention provides an additive for electrolytic copper foil and its application, an electrolytic copper foil and its preparation method and application, and a lithium ion battery, belonging to the technical field of electrolytic copper foil. The invention provides an additive for electrolytic copper foil, including additive A and additive B; wherein, additive A includes a grain refiner and a polyethyleneimine alkyl compound, and the grain refiner and a polyethyleneimine alkyl compound The weight ratio of the compound is 5-20:1-10; the additive B includes collagen and carboxymethyl chitosan, and the weight ratio of collagen and carboxymethyl chitosan is 8-20:1-10. When the additives for electrolytic copper foil including Additive A and Additive B are used to prepare electrolytic copper foil, double-sided photoelectrolytic copper foil with a thickness of only 5-8 μm can be prepared, and the obtained electrolytic copper foil has low warpage and thickness Uniform, no edge tearing phenomenon, fine crystallization.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil, and in particular relates to an additive for electrolytic copper foil and its application, electrolytic copper foil and its preparation method and application, and a lithium ion battery. Background technique [0002] With the rapid development of the new energy industry, lithium-ion batteries are increasingly used in the fields of electronic products and power vehicles. Ultra-thin copper foil as the negative electrode collector of lithium-ion batteries is the key material for the production of lithium-ion battery cells. Under the same mass, ultra-thin copper foil can carry more negative active electrode materials, which is very important for improving the energy of lithium-ion battery cells. Density plays an important role. [0003] The current mainstream electrolytic copper foil used for the negative electrode collector of lithium-ion batteries is generally 5-8 microns thick, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04C25D3/38H01M4/66H01M10/0525H01M10/058
CPCC25D1/04C25D3/38H01M4/661H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 丁瑜王锋付争兵
Owner HUBEI ZHONGYI TECH
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