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Cobalt-containing nickel plated steel strip serving as lithium battery shell material and preparation method thereof

A shell material, lithium battery technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as implementation difficulties, and achieve the effects of reducing coating porosity, improving internal stress distribution, and reducing porosity

Inactive Publication Date: 2011-11-02
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the method of annealing after electroplating and replating is difficult to implement, so far, a method of annealing after electroplating and replating has not been seen to produce a cobalt-containing coating with high bonding force and high corrosion resistance. Nickel-plated steel strips are on the market, but there are no related patents and research papers

Method used

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  • Cobalt-containing nickel plated steel strip serving as lithium battery shell material and preparation method thereof
  • Cobalt-containing nickel plated steel strip serving as lithium battery shell material and preparation method thereof
  • Cobalt-containing nickel plated steel strip serving as lithium battery shell material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] The present invention is used as lithium battery housing material cobalt-containing nickel-plated steel strip and its preparation method. SPCE is used as the base 1, and nickel-cobalt binary alloy films are respectively plated on both sides of the base 1; the nickel-cobalt binary The alloy film 2 is a nanocrystalline coating with a grain size of 50-100nm and a thickness of 2μm; the middle layer 3 is a Ni / Co / Fe diffusion layer with a thickness of 1μm produced after diffusion heat treatment; the surface layer 4 is a grain size of 50-100nm , a nickel-cobalt binary alloy film with a thickness of 2 μm. Such as figure 1 shown.

[0052] Technical process of the present invention sees figure 2 .

[0053] The special steel strip for SPCE batteries with a thickness of 0.3mm produced by a Japanese company is selected as the electroplating substrate.

[0054] Its chemical composition content is: C: ≤0.08 (% means weight percentage, the same below)

[0055] S...

Embodiment 2

[0103] Embodiment 2 coating thickness design and process flow are the same as embodiment 1.

[0104] The coating thickness of the present invention is designed as figure 1 shown.

[0105] Technical process of the present invention sees figure 2 .

[0106] 1. Surface pretreatment before plating

[0107] First put the substrate into the degreasing solution for electrochemical degreasing, then rinse the degreased substrate surface with distilled water, and then put it into the activator for activation;

[0108] The degreasing fluid is:

[0109] Degreasing fluid temperature: 80°C

[0110] Degreasing time: 3min

[0111] After the degreasing is complete, rinse the surface of the sample with distilled water, and then put it into the activator for activation.

[0112] Activator composition: 3vol% HCl

[0113] Activation time: 1.5min.

[0114] 2. Continuous electrodeposited nickel-cobalt alloy coating with a grain size of 50-100nm

[0115] Plating solution composition:

...

Embodiment 3

[0149] Embodiment 3 coating thickness design and process flow are the same as embodiment 1.

[0150] The coating thickness of the present invention is designed as figure 1 shown.

[0151] Technical process of the present invention sees figure 2 .

[0152] 1. Surface pretreatment before plating

[0153] First put the substrate into the degreasing solution for electrochemical degreasing, then rinse the degreased substrate surface with distilled water, and then put it into the activator for activation;

[0154] The degreasing fluid is:

[0155] Degreasing fluid temperature: 80°C

[0156] Degreasing time: 3min

[0157] After the degreasing is complete, rinse the surface of the sample with distilled water, and then put it into the activator for activation.

[0158] Activator composition: 3vol% HCl

[0159] Activation time: 1.5min.

[0160] 2. Continuous electrodeposited nickel-cobalt alloy coating with a grain size of 50-100nm

[0161] Plating solution composition: ...

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Abstract

The invention discloses a cobalt-containing nickel plated steel strip serving as a lithium battery shell material and a preparation method thereof. The preparation method comprises the following procedures of: (1) pretreating a base material; (2) continuously electrodepositing a nickel-cobalt alloy plating layer on the pre-treated base material; (3) carrying out diffusion annealing treatment on the nickel-cobalt alloy plating layer under a protective atmosphere like high-purity nitrogen; (4) plating a nickel-cobalt alloy plating layer on the metal subjected to the diffusion annealing treatment again; and (5) rolling the plated nickel-cobalt alloy plating layer in a cold manner. The cobalt containing nickel plated steel strip disclosed by the invention is prepared by a special process of tightly combining the nickel-cobalt alloy plating layer and a low-carbon steel strip and then electroplating the nickel-cobalt alloy plating layer and the low-carbon steel strip, shows better corrosion resistance and can be used for shell materials of primary batteries, secondary batteries and lithium ion power cells such as 18650, 26650 and the like.

Description

technical field [0001] The invention relates to a cobalt-containing nickel-plated steel strip used as a lithium battery casing material and a preparation method thereof. The cobalt-containing nickel-plated steel strip is formed by closely combining a nickel-cobalt alloy coating with a low-carbon steel strip and then electroplated. The prepared one has ultra-high corrosion resistance, and can be used as shell materials for primary batteries, secondary batteries, 18650, 26650 and other lithium-ion power batteries. Background technique [0002] With the vigorous development of industries such as portable communication equipment, notebook computers, word processors and electric tools, the lithium battery industry has higher and higher requirements for the performance of battery housing materials. The casing of the lithium-ion power battery is not only a sealed container, but also plays a decisive role in the storage performance and safety performance of the battery. On the one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/10C25D5/48C25D3/56H01M2/02
CPCY02E60/12Y02E60/10
Inventor 潘勇张敏捷李玮黄少军朱经涛周兆锋雷维新
Owner XIANGTAN UNIV
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