Porous zinc-nickel alloy negative electrode material for zinc-air battery and preparation method thereof

A zinc-air battery and zinc-nickel alloy technology, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problem of poor distribution uniformity of zinc-nickel alloy elements, rough coating, difficult Accurate control of the co-deposition rate of zinc and nickel to achieve the effects of improving storage capacity and electrochemical performance, increasing reaction rate, and strong corrosion resistance

Inactive Publication Date: 2018-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although the standard electrode potential of zinc (-0.762V) is much negative than the standard electrode potential of nickel (-0.246V), zinc is deposited preferentially over nickel during the electroplating process, which belongs to abnormal electrolytic co-deposition. It is difficult to accurately control the co-deposition rate of zinc and nickel, which will easily lead to problems such as poor distribution of elements in the resulting zinc-nickel alloy and rough coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First pass the nickel foam with a tab area of ​​3×4cm on the short side with a copper wire with a diameter of 2mm, and solder it firmly with solder, coat the solder joint with epoxy resin, let it solidify overnight, and remove the oil It is used as a cathode after deoxidation treatment. After polishing the high-purity zinc sheet with a specification of 4×6×0.3cm with sandpaper, drill a hole on the side and pass it through with a copper wire and weld it firmly, and use it as an anode after cleaning. Immerse the treated foam nickel cathode and zinc sheet anode in the electroplating solution, the volume of the electroplating solution is 400mL, wherein zinc chloride (ZnCl 2 )55g / L, nickel chloride (NiCl 2 ) 15g / L, ammonium chloride (NH 4 Cl) 220g / L, triethanolamine 25g / L, polyethylene glycol (PEG) 5g / L of molecular weight 3000. The temperature of the solution was controlled at 35° C., and the pH value was adjusted to 5.5 with ammonia water. The distance between the two ...

Embodiment 2

[0040] First pass the nickel foam with a tab area of ​​3×6cm on the short side with a copper wire with a diameter of 2mm, and solder it firmly with solder, coat the solder joint with epoxy resin, let it solidify overnight, and remove the oil It is used as a cathode after deoxidation treatment. After polishing the high-purity zinc sheet with a specification of 4×8×0.3cm with sandpaper, drill a hole on the side and pass it through with a copper wire and weld it firmly, and use it as an anode after cleaning. Immerse the treated foam nickel cathode and zinc sheet anode in the electroplating solution, the volume of the electroplating solution is 350mL, and zinc oxide (ZnO) 25g / L, nickel sulfate (NiSO 4 ) 9g / L, potassium hydroxide (KOH) 140g / L, piperonal 0.1g / L, triethanolamine 25g / L. The temperature of the solution is controlled at 35°C, the pH value is adjusted to 11 with ammonia water, the distance between the two electrodes is 3cm, and the cathode current density is 1.2A / dm 2 ...

Embodiment 3

[0043] First pass the nickel foam with a tab area of ​​4×6cm on the short side with a copper-plastic wire with a copper diameter of 2mm, and solder it firmly with solder, coat the solder joint with epoxy resin, and let it solidify overnight. It is used as a cathode after degreasing and deoxidizing treatment. After polishing the high-purity zinc sheet with a specification of 4×7×0.3cm with sandpaper, drill a hole on the side and pass it through with a copper wire and weld it firmly. After cleaning, it can be used as an anode. Immerse the treated foam nickel cathode and zinc sheet anode in the electroplating solution, the volume of the electroplating solution is 350mL, and zinc oxide (ZnO) 22g / L, nickel sulfate (NiSO 4 ) 7g / L, sodium hydroxide (NaOH) 120g / L, piperonal 0.2g / L, triethanolamine 20g / L, the solution temperature is controlled at 40°C, the pH value is adjusted to 11 with ammonia water, the distance between the two poles is 3cm, and the cathode current density 1.5A / dm ...

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Abstract

The invention discloses a porous zinc-nickel alloy negative electrode material for a zinc-air battery and a preparation method thereof, belonging to the field of new energy technology development. The porous zinc-nickel alloy negative electrode material of the present invention is composed of a foamed nickel substrate and a zinc-nickel alloy coating evenly coated on the foamed nickel substrate; the molar ratio of nickel to zinc in the zinc-nickel alloy coating is 0.01-0.20:1. In the present invention, nickel foam is used as the cathode, and zinc and nickel are deposited on the surface of the nickel foam substrate by electroplating in an electroplating solution containing functional additives to obtain a nickel-zinc molar ratio of 0.01-0.20:1, a pore diameter of 20-500 μm, and a coating thickness of 10 μm- 2000μm porous zinc-nickel alloy anode material for zinc-air batteries. The structure design of the material in the invention is reasonable, the preparation process is simple, and it is convenient for large-scale industrial application and production.

Description

technical field [0001] The invention discloses a porous zinc-nickel alloy negative electrode material for a zinc-air battery and a preparation method thereof, belonging to the field of new energy technology development. Background technique [0002] As an energy storage device, the battery can well store the electric energy generated by other clean energy sources and provide it to various devices, so it has been widely used and researched. As an aqueous metal-air battery, zinc-air batteries have the advantages of high specific energy, good safety, stable discharge voltage, abundant raw materials, and environmental friendliness. But at the same time, alkaline zinc-air batteries have problems such as easy corrosion of negative electrode materials, dendrite formation, negative electrode deformation, and zinc dissolution. These problems hinder the further commercial application of zinc-air batteries. [0003] As the active material of the alkaline zinc-air battery, the performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/42H01M12/08
CPCH01M4/42H01M12/08Y02E60/10
Inventor 田忠良赖延清杨超张志剑杨凯郭伟昌李劼
Owner CENT SOUTH UNIV
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