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Nickel plated copper product containing nickel-cobalt alloy clad layer, and preparation method and application thereof

A technology of nickel-cobalt alloy and nickel-plated copper, which is applied in the field of battery manufacturing, can solve the problems of being unable to meet the requirements of high-rate lithium-ion battery negative electrode tabs, reducing material corrosion resistance, and not clearly pointing out, so as to achieve fine grain size. Effects of oxidization, prevention of grain growth, and recovery of metal ion concentration

Active Publication Date: 2015-11-18
HUNAN YONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention patent CN102330124A relates to a pulse electrochemical deposition and tissue adjustment process of nickel-plated copper strip. The cold rolling process is easy to cause damage to the nickel coating due to physical damage, reducing the corrosion resistance of the material; the invention patent CN101245480A discloses a method for preparing a nickel coating on the metal surface. On the tin layer, after the nickel layer is plated, potassium dichromate passivation, hydrogen removal heat treatment and high temperature annealing diffusion heat treatment are used. A large number of experiments have shown that the nickel coating after passivation cannot be tinned; the invention patent CN101705509A discloses a The low-stress nickel plating process is mainly used in the anti-corrosion field of high-strength stainless steel. Its innovations include hydrogen removal heat treatment before and after electroplating to eliminate the hydrogen evolution internal stress of the material and prevent hydrogen evolution corrosion.
Due to the different requirements for nickel plating on nickel-plated copper lugs and nickel-plated metal products in other fields, common process methods cannot meet the requirements for producing high-rate lithium-ion battery negative pole lugs.

Method used

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  • Nickel plated copper product containing nickel-cobalt alloy clad layer, and preparation method and application thereof
  • Nickel plated copper product containing nickel-cobalt alloy clad layer, and preparation method and application thereof
  • Nickel plated copper product containing nickel-cobalt alloy clad layer, and preparation method and application thereof

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Effect test

Embodiment 1

[0058] A preparation method of a nickel-plated copper material containing a nickel-cobalt alloy coating of the present invention is used for high-rate lithium-ion battery tab materials, using semi-hard pure copper as the base material, and electrodepositing a thickness of 0.4 μm crystal on both sides of the base with a small current. A nickel-cobalt alloy coating with a particle size of 50-100nm, and then electrodeposit a high-solderability nickel coating with a thickness of 1.4μm and a grain size of 100-600nm on the nickel-cobalt alloy coating, and finally pass the material through 550°C for 2h Reducing atmosphere heat treatment and 200°C 4h dehydrogenation heat treatment process to form a 0.3μm copper-nickel-cobalt alloy layer.

specific Embodiment approach

[0059] Its specific implementation method comprises the following steps:

[0060] (1) Pretreatment: Ultrasonic degreasing, electrolytic degreasing and activation treatment are performed on the pure copper strip. The ultrasonic degreasing temperature is 45°C, the ultrasonic frequency is 20kHz, and the degreasing time is 1min. The degreasing liquid formula is sodium carbonate 30g / L, trisodium phosphate 20g / L, and sodium hydroxide 30g / L. Electrolytic degreasing temperature is 55℃, current density is 5A / dm 2 , oil removal time 1.5min, oil removal formula sodium carbonate 30g / L, trisodium phosphate 20g / L, sodium hydroxide 30g / L. The concentration of sulfuric acid in the activation treatment is 8%, the solution temperature is 25°C, and the treatment is about 1 min.

[0061] (2) Electrodeposited nickel coating: including electrodeposited nickel-cobalt alloy layer and electroplated high solderability nickel coating. The formula of nickel-cobalt alloy solution is nickel sulfate 300g...

Embodiment 2

[0075] The preparation method of a nickel-plated copper material containing a nickel-cobalt alloy coating of the present invention is used for high-rate lithium-ion battery tab materials, with soft pure copper as the base material, and a small current electrodeposition thickness of 0.2 μm crystal grains on both sides of the base Nickel-cobalt alloy coating with a size of 50-100nm, and then electro-depositing a high-solderability nickel coating with a thickness of 1μm and a grain size of 300-600nm on the nickel-cobalt alloy coating, and finally heat-treating the material in a reducing atmosphere at 2.5h650°C And 260 ℃ 4h dehydrogenation heat treatment process to form a 0.5μm copper-nickel-cobalt alloy layer.

[0076] Its specific implementation method comprises the following steps:

[0077] (1) Pretreatment: Ultrasonic degreasing, electrolytic degreasing and activation treatment are performed on the pure copper strip. The ultrasonic degreasing temperature is 50°C, the ultrason...

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Abstract

The invention relates to a nick plated copper product containing a nickel-cobalt alloy clad layer, and the preparation method and the application thereof, and belongs to the technical field of battery manufacturing. The nick plated copper product provided by the invention comprises pure copper, a nickel-cobalt-copper alloy layer, a nickel-cobalt alloy layer and a nickel layer from the inside out in sequence, wherein the thickness of the nickel-cobalt-copper alloy layer is 0.2 to 0.6 mum, the thickness of the nickel-cobalt alloy layer is 0.2 to 0.6 mum, and the thickness of the nickel layer is 0.6 to 2.6 mum. According to the nick plated copper product provided by the invention, activated pure copper is taken as a base material, a pulse power supply is adopted for electroplating, and by plating nickel and cobalt alloy under low electric current density firstly, carrying out nick plating under high electric current density of an electrolyte solution containing high weldability nick plating additive, and taking an annealing treatment and dehydrogenation heat treatment matched with the electroplating process for assisting after the accomplish of electroplating, the nickel-plated copper product which is strong in clad layer bonding force, is corrosion-resistant, folding resisting and easy to weld can be obtained. The nickel-plated copper product prepared by the invention has performances far superior to those of like products when being used for high-magnification lithium ion battery nickel-plated copper strip tabs. The preparation technology provided by the invention is simple and controllable, and is convenient for realizing industrial production.

Description

technical field [0001] The invention relates to a nickel-plated copper material containing a nickel-cobalt alloy coating and a preparation method and application thereof, belonging to the technical field of battery manufacturing. Background technique [0002] At present, it is difficult for commercial lithium-ion batteries to achieve continuous discharge at a rate above 20C. The main reason is that when the battery is discharged at a high rate, the tabs heat up severely, and the overall temperature of the battery is too high, which makes the battery prone to thermal runaway, which leads to the battery rate. Discharge performance and cycle performance deteriorate. Conventional lithium-ion battery manufacturers use nickel lugs for the negative electrode, which has poor conductivity, with a conductivity of 1.4×10 5 S / cm, the positive electrode uses aluminum lugs, and its conductivity is 3.69×10 5 S / cm. During high-rate discharge, due to the low electrical conductivity and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18C25D3/12C25D5/34C25D5/50
Inventor 尹业文窦坤鹏杨阳阳田槟铖周亮罗凌云
Owner HUNAN YONGSHENG NEW MATERIALS
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