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An additive for electrolytic copper foil and a production process for preparing electrolytic copper foil for dual photocells

An electrolytic copper foil and production process technology, applied in the electrolysis process, electroforming and other directions, can solve the problems of surface wrinkling of battery foil, affect the quality of bi-photovoltaic battery foil, reduce production effect, etc., and achieve the effect of alleviating defects such as wavy lines

Active Publication Date: 2019-02-26
灵宝宝鑫电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the portability of electronic products and the development of new energy vehicles, lithium-ion batteries have rapidly increased the amount and quality requirements of current collector copper foil. The copper foil used in lithium-ion power batteries in the early days was rolled copper foil. Electrolytic copper foil is due to The roughness of the rough surface, low tensile strength and elongation cannot be used as copper foil for lithium-ion batteries. However, there are problems such as high cost and low strength after annealing of rolled copper foil. With the development of electrolytic copper foil technology in the later period , mainly due to the advancement of additive technology, high-strength, high-elongation dual-photoelectrolytic copper foil has been developed for high-end lithium-ion batteries, and it is gradually developing in the direction of ultra-thin, ultra-high strength and elongation
[0003] In the actual production of electrolytic copper foil, the electrolyte circulation volume is mostly 100m 3 Above, if the additives are not adjusted properly, it will increase the amount of waste and reduce the production effect, which will seriously affect the normal production and waste resources
Additives play a pivotal role in the production of biphotonic battery foil. At present, there are many kinds of additives for biphotonic battery foil. According to their functions, they are mainly brighteners, leveling agents, grain refiners, and wetting agents. Sodium sulfodipropane sulfonate (SPS), thiourea, gelatin, polyethylene glycol, polypropylene glycol, etc., the composite additives in actual production have complex effects, and the result of the joint action of several additives
In general, there is a game balance between the formula and dosage of additives, which directly affects the quality of double photocell foil. There is a relatively loose range for the addition and dosage of suitable additives, that is, the dosage of additives can ensure the quality of qualified copper foil within a relatively wide range, and vice versa. The additive dosage range is narrow. The additive dosage can guarantee the qualified copper foil quality within a relatively wide range; if the additive dosage is small, the battery foil will have low brightness, large roughness, and serious warping (that is, after cutting a certain area of ​​copper foil, place it There are problems such as warping or curling on the horizontal plane), the amount of additives is large, and the battery foil is prone to surface wrinkles (that is, the entire width of the copper foil is flattened by a fixed tension, and there are some wavy wrinkles) and other defects.

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  • An additive for electrolytic copper foil and a production process for preparing electrolytic copper foil for dual photocells

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Effect test

Embodiment 1

[0014] An additive for electrolytic copper foil, the additive is an aqueous solution, in which gelatin 3 g / L, glucose 1.5 g / L, sodium polydithiodipropanesulfonate (SPS) 3 g / L, dimethyl-dithiocarbonylpropane Sodium sulfonate (DPS) 2.5 g / L, isothiuronium propanesulfonic acid inner salt (UPS) 2 g / L.

[0015] The production process for preparing electrolytic copper foil for dual photocells with the additive includes the steps of dissolving copper solution, electrolytic raw foil, and anti-oxidation treatment. Additives for electrolytic copper foil.

[0016] The process of dissolving copper solution is as follows: add the raw material copper rod after annealing to remove impurities into the copper dissolving tank, add water and dilute sulfuric acid and blow in air to dissolve it to form copper sulfate electrolyte, adjust the copper in the copper sulfate electrolyte Ion content, sulfuric acid concentration, chloride ion content and temperature indicators reach the specified range. ...

Embodiment 2

[0020] An additive for electrolytic copper foil, which is an aqueous solution, in which gelatin 5 g / L, glucose 2 g / L, sodium polydithiodipropanesulfonate (SPS) 2 g / L, dimethyl-dithiocarbonylpropane Sodium sulfonate (DPS) 2 g / L, isothiuronium propanesulfonic acid inner salt (UPS) 2 g / L.

[0021] The production process for preparing electrolytic copper foil for dual photocells with the additive includes the steps of dissolving copper solution, electrolytic raw foil, and anti-oxidation treatment. Additives for electrolytic copper foil.

[0022] The process of dissolving copper solution is as follows: add the raw material copper rod after annealing to remove impurities into the copper dissolving tank, add water and dilute sulfuric acid and blow in air to dissolve it to form copper sulfate electrolyte, adjust the copper in the copper sulfate electrolyte Ion content, sulfuric acid concentration, chloride ion content and temperature indicators reach the specified range.

[0023] Th...

Embodiment 3

[0026] An additive for electrolytic copper foil, which is an aqueous solution, in which gelatin 5 g / L, glucose 2 g / L, sodium polydithiodipropanesulfonate (SPS) 2 g / L, dimethyl-dithiocarbonylpropane Sodium sulfonate (DPS) 2 g / L, isothiuronium propanesulfonic acid inner salt (UPS) 2 g / L.

[0027] The production process for preparing electrolytic copper foil for dual photocells with the additive includes the steps of dissolving copper solution, electrolytic raw foil, and anti-oxidation treatment. Additives for electrolytic copper foil.

[0028] The process of dissolving copper solution is as follows: add the raw material copper rod after annealing to remove impurities into the copper dissolving tank, add water and dilute sulfuric acid and blow in air to dissolve it to form copper sulfate electrolyte, adjust the copper in the copper sulfate electrolyte Ion content, sulfuric acid concentration, chloride ion content and temperature indicators reach the specified range.

[0029] Th...

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Abstract

The invention discloses an additive for electrodeposited copper foil which is aqueous solution prepared from 2-10 g / L gelatin, 1-5 g / L glucose, 2-10 g / L sodium 3,3'-dithiodipropane sulfonate (SPS), 2-10 g / L dimethyl disulfide carbonyl propane sulfonic acid sodium (DPS), and 2-5 g / L 3-s-thiuronium propyl sulfonate (UPS). The invention further discloses production technology for preparing electrodeposited copper foil for double-shiny battery comprising the steps of copper dissolution and solution preparation, foil electrolysis and organic solderability preservative treatment. In the step of foil electrolysis, copper sulfate electrolyte drawn from the step of copper dissolution and solution preparation is added with the electrodeposited copper foil as additive. The copper foil prepared in the additive for electrodeposited copper foil and production technology for preparing electrodeposited copper foil for double-shiny battery: thickness<=12Mum, thickness difference<=0.5Mum, roughnessRz<=1.5Mum, radiance: 80-300 units of gloss, tensile strength in room temperature>=400MPa, and extensibility: 3-10%.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil production, and specifically relates to an additive for electrolytic copper foil and a production process for preparing electrolytic copper foil for double photocells. Background technique [0002] With the portability of electronic products and the development of new energy vehicles, lithium-ion batteries have rapidly increased the amount and quality requirements of current collector copper foil. The copper foil used in lithium-ion power batteries in the early days was rolled copper foil. Electrolytic copper foil is due to The roughness of the rough surface, low tensile strength and elongation cannot be used as copper foil for lithium-ion batteries. However, there are problems such as high cost and low strength after annealing of rolled copper foil. With the development of electrolytic copper foil technology in the later period , mainly due to the advancement of additive technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04
CPCC25D1/04
Inventor 李应恩樊斌锋董景伟牛晶晶王建智何铁帅韩树华王媛媛
Owner 灵宝宝鑫电子科技有限公司