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

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...

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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.

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