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Preparation method and preparation system of 4.5 [mu]m ultrathin copper foil for lithium battery

A technology of ultra-thin copper foil and lithium battery, applied in electroforming, electrolytic components, electrolytic process, etc., can solve the problem of large organic matter content

Active Publication Date: 2020-10-30
JIANGDONG ELECTRONIC MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent Publication Nos. CN110396704A and CN110438531A disclose two preparation methods of ultra-thin electrolytic copper foil respectively, but the addition amount of each component of the additives is tens to hundreds of mg / L (ie ppm), and the organic matter content is relatively high. Big

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  • Preparation method and preparation system of 4.5 [mu]m ultrathin copper foil for lithium battery

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preparation example Construction

[0022] A preparation method of 4.5 μm ultra-thin copper foil for lithium batteries, characterized in that it comprises the following steps:

[0023] Step 1: Prepare electrolyte.

[0024] Electrolyte is prepared in the net liquid tank 7; the copper material is blown and oxidized in the copper melting tank, and then reacted with dilute sulfuric acid solution at 40-75°C to form a copper sulfate solution, which is then passed through diatomite, activated carbon, and oil removal filter bags. Filtrate, and use a plate heat exchanger to adjust the temperature to 35-82° C. to prepare an electrolyte with high purity.

[0025] The copper ion content in the electrolyte is 60~110g / L, the sulfuric acid content is 40~150g / L, the bath temperature is 40~60°C, and the electrolytic current density is 2000-10000A / ㎡. According to Faraday's law, the copper foil speed is the speed of winding roller 1. The winding speed is 2~10m / min.

[0026] Step 2: Add additives to the prepared electrolyte, the ...

Embodiment 1

[0037] A preparation method of 4.5 μm ultra-thin copper foil for a lithium battery, comprising the following steps:

[0038] Step 1: Prepare the electrolyte; after the copper material is blown and oxidized in the copper melting tank, react with dilute sulfuric acid solution at 40~50°C to form copper sulfate solution, and then filter through diatomite, activated carbon, oil removal filter bag, etc. , and the plate heat exchanger is used to adjust the temperature to 35~65°C to prepare an electrolyte with high purity. In the copper sulfate electrolyte, the concentration of Cu2+ is 60~85g / L, and the concentration of H2SO4 is 40~800g / L; the temperature of the electrolyte is controlled at 40~500°C, and the flow rate of the electrolyte is 50~90m³ / h.

[0039]Step 2: Add additives to the electrolyte; the additives include one or two or three of hydroxyethyl cellulose, hydroxypropyl cellulose or hydroxypropyl methyl cellulose, with a total content of 5-7ppm, polyethylene One or two of ...

Embodiment 2

[0045] A preparation method of 4.5 μm ultra-thin copper foil for a lithium battery, comprising the following steps:

[0046] Step 1: Prepare the electrolyte; after the copper material is blown and oxidized in the copper melting tank, it is reacted with a dilute sulfuric acid solution at 55~70°C to form a copper sulfate solution, and then filtered through diatomite, activated carbon, and oil removal filter bags, etc. , and the plate heat exchanger is used to adjust the temperature to 65~80°C to prepare an electrolyte with high purity. In the copper sulfate electrolyte, the concentration of Cu2+ is 90~110g / L, and the concentration of H2SO4 is 80~120g / L; the temperature of the electrolyte is controlled at 60~70°C, and the flow rate of the electrolyte is 90~1500m³ / h.

[0047] Step 2: Add additives to the electrolyte; the additives include one or two or three of hydroxyethyl cellulose, hydroxypropyl cellulose or hydroxypropyl methyl cellulose, with a total content of 7-10ppm, polye...

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Abstract

The invention discloses a preparation method and a preparation system of a 4.5 [mu]m ultrathin copper foil for a lithium battery. The preparation method comprises the following steps of preparing an electrolyte; adding additives into the prepared electrolyte, wherein the additives comprise cellulose, polyethylene glycol, thiourea compounds and a leveling agent; and filtering the electrolyte with the additives added, and feeding the electrolyte into an electrolytic cell for electrolytic foil formation, wherein the cellulose comprises a combination of one or more of hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose, one or two of sodium 2-mercaptoethane sulfonate and 2-propenyl thiourea are adopted as the thiourea compounds, and one or two of polyethyleneimine and 9-phenylacridine are adopted as the leveling agent. According to the preparation method and the preparation system, the 4.5 [mu]m ultrathin copper foil can be prepared only with a small amount of additives, organic matters in the finished copper foil are reduced, and the internal performance of the copper foil is improved.

Description

technical field [0001] The invention relates to a copper foil preparation method and a preparation system thereof, in particular to a 4.5 μm ultra-thin copper foil preparation method and a preparation system for a lithium battery, belonging to the field of copper foil manufacturing technology. Background technique [0002] With the development of battery manufacturing technology, the thickness of electrolytic copper foil used in lithium-ion batteries is gradually becoming thinner; this requires ultra-thin copper foil to have high tensile strength and high ductility at the same time, ensuring that it can be used in battery production and processing. There will be no defects such as breakage and deformation during use, so that the thickness of the coated active material is uniform and the service life of the battery is prolonged. Due to the ultra-thin characteristics of 4,5μm copper foil, more electrolyte can be injected into the battery case with the same volume, thereby incr...

Claims

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Application Information

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IPC IPC(8): C25D1/04C25D19/00C25D17/00
CPCC25D1/04C25D17/00
Inventor 隋景昕闫瑞刚徐颖赵乾成张小龙
Owner JIANGDONG ELECTRONIC MATERIALS CO LTD
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