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Method for preparing foamed metal

A foamed metal and foamed plastic technology, applied in electroforming, electrolysis process, etc., can solve the problem of uneven surface density of foamed metal, and achieve the effect of good capacity retention rate, uniform battery capacity and internal resistance, and uniform surface density

Inactive Publication Date: 2008-11-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of non-uniform areal density of foamed metal in the prior art, and provide a kind of preparation method of the foamed metal that makes the areal density of foamed metal uniform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0009] The preparation method of the metal foam provided by the present invention comprises that the method comprises conducting the foamed plastic substrate, electroplating metal on the conductive foamed plastic substrate, and then removing the foamed plastic substrate; and electroplating the metal on the conductive foamed plastic substrate Including, contacting the conductive foamed plastic substrate as the cathode with the electroplating solution, and electroplating under the condition of electroplating, the electroplating solution is an aqueous solution of the salt of the electroplating metal, and it is characterized in that, in the electroplating process, an insoluble anode is used to maintain The content of the electroplating metal salt in the electroplating solution is 100-500 g / L, preferably 200-400 g / L, and the pH value is 2-5, preferably 2.5-3.8.

[0010] According to the method provided by the invention, the reaction that takes place in the electroplating process is,...

Embodiment 1

[0030] 1. Preparation of nickel foam

[0031] Select 50 square meters of continuous polyurethane sponge (hole density 110PPI (number of holes in one inch length), width 1000 mm, thickness 1.9 mm) as the foam plastic substrate.

[0032] Immerse the polyurethane sponge matrix in the conductive glue (containing 8% by weight of graphite and 2% by weight of acrylamide binder, pH is 10) for 8 minutes, then take out the polyurethane sponge matrix and squeeze out the excess conductive glue, and then in 100 ℃ Set aside to dry.

[0033] The polyurethane sponge matrix coated with conductive glue is used as the cathode and immersed in the electroplating solution (200 g / L nickel sulfate, 50 g / L boric acid, pH 2.5), and the tantalum-iridium-titanium mesh is used as the anode. Turn on the DC power supply, the current density is 10A / dm 2 , electroplating at 50° C. for 50 minutes, while continuously adding nickel hydroxide at a rate of 20 g / min during the electroplating process.

[0034] Bu...

Embodiment 2

[0047] Foam nickel is prepared according to the method described in Example 1 and a battery is made, except that in the electroplating process, the electroplating solution contains 400 g / liter of nickel sulfate, 20 g / liter of boric acid, a pH of 3.8, and 60 g of Nickel sulfate was continuously added at an addition speed of 20 g / min, and sodium hydroxide was added at an addition speed of 20 g / min.

[0048] Obtain nickel foam and make 30 batteries of nickel-cadmium SC-1700mAh model.

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PUM

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Abstract

The invention relates to a preparation method of a foam metal, which comprises the conductivity attachment of a foam plastic substrate, the metal galvanization on the foam plastic substrate that is attached with conductivity and the removing of the foam plastic substrate; the method of metal galvanization on the foam plastic substrate that is attached with conductivity comprises following steps: the foam plastic substrate that is attached with conductivity is used as a cathode so as to contact with electroplate liquid and implement galvanization under the galvanization condition, and the electroplate liquid is an aqueous solution of a salt of a galvanized metal; wherein, in the galvanization process, an insoluble anode is adopted, the content of the salt of the galvanized metal in the electroplate liquid is maintained between 100 and 500 grams per liter, and pH value is maintained between 2 and 5. The foam metal produced by adopting the preparation method of a foam metal provided by the invention has excellent uniformity of planar density.

Description

technical field [0001] The invention relates to a method for preparing foam metal. Background technique [0002] Alkaline batteries are assembled from positive plates, negative plates, electrolytes and separators inside a battery steel case. Positive and negative plates are generally made by coating a mixture of active materials, additives and binders on a conductive substrate. The conductive substrate is generally made of metal foam such as nickel foam or copper foam, perforated metal strip, steel strip with perforated electroplated metal, etc., due to the special three-dimensional network structure of foam metal such as foam nickel or copper foam, large specific surface area, high Porosity, excellent permeability and great fillability are preferred as conductive substrates. The special microporous structure of metal foam can make full use of the active material of the electrode, reduce the internal resistance of the battery, increase the reaction area, and thus improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/08
Inventor 毕国忠刘涛薜永标
Owner BYD CO LTD
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