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Zinc oxide negative electrode material of zinc air cell and preparation method thereof

A zinc-air battery and negative electrode material technology, which is applied in the direction of battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of low zinc negative maximum current charging capacity, insufficient structural strength of the coating layer, and insufficient cycle life, etc., to achieve large Improved current charging capability, reduced concentration polarization, and extended cycle life

Inactive Publication Date: 2017-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the H caused by the surface coating modification of the negative electrode active material of the existing secondary zinc-air battery 2 O and OH - The diffusion of zinc is hindered, the charging capacity of the zinc negative maximum current is low, the structural strength of the coating layer is not enough, it is easy to break and collapse, and the cycle life is insufficient. The first purpose of the present invention is to provide a method that can effectively While limiting the diffusion of discharge products and the electrical agglomeration of active particles, it can ensure that the electrolyte can quickly pass through the surface coating layer to reach the reaction interface, improve the high-current charging capacity of the surface-coated zinc oxide, and prevent the growth and deformation of particle dendrites, and Zn / The cladding layer is broken and collapsed due to the volume expansion caused by the ZnO crystal transformation, and the zinc oxide anode material that prolongs the cycle life of zinc-air batteries

Method used

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  • Zinc oxide negative electrode material of zinc air cell and preparation method thereof
  • Zinc oxide negative electrode material of zinc air cell and preparation method thereof
  • Zinc oxide negative electrode material of zinc air cell and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] Zinc oxide anode material: the thickness of the inner coating layer of polyacrylic acid is 5nm, and the thickness of the outer coating layer of indium hydroxide is 3nm.

[0037] Preparation of zinc oxide anode material: add 0.5 g of zinc oxide (with a particle size of 0.2-0.7 microns) to 50 ml of deionized water, ultrasonically disperse for 30 minutes, add 0.05 g of aminopropyltriethoxysilane, and stir for 5 hours at room temperature. After centrifugal separation, the product was washed alternately with ethanol and water three times, and dried in vacuum to obtain amino-functionalized zinc oxide. Then, add amino-functionalized zinc oxide to 250ml of 0.26mmol / L acrylic monomer solution, ultrasonically disperse for 10min and stir for 2h, add ammonium persulfate initiator containing 2wt% of polymer monomer and start at 80℃ Polymerization. After 4 hours of reaction, the product was centrifuged and washed alternately with ethanol and water three times to obtain zinc oxide coate...

Embodiment 2

[0041] Zinc oxide anode material: the thickness of the inner coating layer of polymethacrylic acid is 5nm, and the thickness of the outer coating layer of tin dioxide is 5nm.

[0042] Preparation of zinc oxide anode material: 1 g of zinc oxide was added to 100 ml of deionized water, ultrasonically dispersed for 30 minutes, 0.3 g of aminopropyltriethoxysilane was added, and stirred at room temperature for 4 hours. After centrifugal separation, the product was washed alternately with ethanol and water three times, and dried in vacuum to obtain amino-functionalized zinc oxide. Then, add 0.5g of amino-functionalized zinc oxide to 250ml of 0.26mmol / L methacrylic acid monomer solution, ultrasonically disperse for 10min and stir for 3h, add 1.5wt% ammonium persulfate initiator with polymer monomer At 65 。 C starts the polymerization reaction. After reacting for 7 hours, the product was centrifuged and washed alternately with ethanol and water three times to obtain zinc oxide coated wit...

Embodiment 3

[0045] Zinc oxide anode material: the thickness of the inner coating layer of acrylic acid methacrylic acid copolymer is 6nm, and the thickness of the outer coating layer of indium hydroxide is 10nm.

[0046] Preparation of zinc oxide anode material: add 0.5 g of zinc oxide to 50 ml of deionized water, ultrasonically disperse for 30 minutes, add 0.25 g of aminopropyltriethoxysilane, and stir for 3 hours at room temperature. After centrifugal separation, the product was washed alternately with ethanol and water three times, and dried in vacuum to obtain amino-functionalized zinc oxide. Then, the amino-functionalized zinc oxide was added to 250ml of 0.27mmol / L polymer monomer solution (acrylic acid monomer: methacrylic acid monomer molar ratio = 1:1), ultrasonically dispersed for 10 minutes and stirred for 2 hours, adding content The ammonium persulfate initiator, which is 3 wt% of the polymer monomer, starts the polymerization reaction at 85°C. After reacting for 5 hours, the pro...

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Abstract

The invention relates to a zinc oxide negative electrode material of a zinc air cell and a preparation method thereof. The zinc oxide negative electrode material comprises a double-coating-layer structure, the double-coating-layer structure is that an inner coating layer is further evenly distributed between zinc oxide and an outer coating layer, the inner coating layer is a polymer coating layer, polymer used in the polymer coating layer is chosen from one of strong-base-resistant polyacrylic acid polymer, polymethylacrylic acid or acrylic acid polymer and methacrylic acid polymer, and the outer coating layer is an indium hydroxide and / or stannic oxide layer. According to the preparation method of the zinc oxide negative electrode material, a silane coupling agent is utilized to perform surface modification on the surface of zinc oxide, and then hexamine deposition metal oxide and / or hydroxide is utilized to achieve even coating of the outer coating layer. The zinc oxide negative electrode material disclosed by the invention effectively solves the problem of dendritic growth and deformation and the problem that the coating layers are prone to breaking and collapsing due to volume expansion generated by Zn / ZnO crystal transfer; thus, a finished product which has excellent rate capability and long cycle life can be obtained.

Description

Technical field [0001] The invention relates to a zinc oxide negative electrode material and a preparation method thereof, in particular to a zinc oxide negative electrode material for alkaline zinc-air secondary batteries, belonging to the field of air batteries. Background technique [0002] Metal-air batteries have the advantages of large capacity and high energy density. Among them, the water-based zinc-air battery is considered to be one of the most promising secondary metal-air batteries because of its simple battery structure, high energy density, easy storage, low cost, safety, and environmental protection and pollution-free advantages. However, due to the high solubility of zinc oxide as the negative electrode product, the negative electrode of zinc-air battery is prone to deformation and dendrite growth during charging, which causes its discharge capacity to decay rapidly, and the battery cycle life is short, and commercial applications are greatly restricted. [0003] I...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M12/08
CPCH01M4/366H01M4/48H01M4/62H01M12/08H01M2004/027Y02E60/10
Inventor 田忠良赖延清张志剑郭伟昌杨超赵泽军张凯张红亮李劼
Owner CENT SOUTH UNIV
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