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A zinc oxide negative electrode material for a zinc-air battery and a preparation method thereof

A zinc-air battery and negative electrode material technology, applied in battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of low high-current charging capacity of zinc negative electrodes, insufficient structural strength of the coating layer, insufficient cycle life, etc. Effects of improved current charging capability, reduced concentration polarization, and extended cycle life

Inactive Publication Date: 2019-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A zinc oxide negative electrode material for a zinc-air battery and a preparation method thereof
  • A zinc oxide negative electrode material for a zinc-air battery and a preparation method thereof
  • A zinc oxide negative electrode material for a zinc-air battery and a preparation method thereof

Examples

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Embodiment 1

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

[0037] Preparation of zinc oxide negative electrode material: Add 0.5 g of zinc oxide (0.2-0.7 microns in particle size) into 50 ml of deionized water, ultrasonically disperse for 30 min, add 0.05 g of aminopropyltriethoxysilane, and stir at room temperature for 5 hours. After the product is separated by centrifugation, it is alternately washed with ethanol and water for three times, and dried in vacuum to obtain amino functionalized zinc oxide. Then, the amino-functionalized zinc oxide was added to 250ml concentration of 0.26mmol / L acrylic acid monomer solution, ultrasonically dispersed for 10min and stirred for 2h, and the ammonium persulfate initiator whose content was 2wt% of the polymer monomer was added and started at 80°C Polymerization. After reacting for 4 hours, the pr...

Embodiment 2

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

[0042] Preparation of zinc oxide negative electrode material: Add 1 g of zinc oxide into 100 ml of deionized water, ultrasonically disperse for 30 min, add 0.3 g of aminopropyltriethoxysilane, and stir at room temperature for 4 hours. After the product is separated by centrifugation, it is alternately washed with ethanol and water for three times, and dried in vacuum to obtain amino functionalized zinc oxide. Then, 0.5 g of amino-functionalized zinc oxide was added to 250 ml of a concentration of 0.26 mmol / L methacrylic acid monomer solution, ultrasonically dispersed for 10 min and stirred for 3 h, and an ammonium persulfate initiator with a content of 1.5 wt % of the polymer monomer was added at 65 。 C starts the polymerization reaction. After reacting for 7 hours, th...

Embodiment 3

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

[0046] Preparation of zinc oxide negative electrode material: Add 0.5 g of zinc oxide into 50 ml of deionized water, ultrasonically disperse for 30 min, add 0.25 g of aminopropyltriethoxysilane, and stir at room temperature for 3 hours. After the product is separated by centrifugation, it is alternately washed with ethanol and water for three times, and dried in vacuum to obtain amino functionalized zinc oxide. Then, add amino-functionalized zinc oxide to 250ml of polymer monomer solution with a concentration of 0.27mmol / L (acrylic acid monomer:methacrylic acid monomer molar ratio=1:1), ultrasonically disperse for 10min and stir for 2h, add content The ammonium persulfate initiator, which is 3 wt% of polymer monomers, starts the polymerization reaction at 85°C. Af...

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Abstract

The invention relates to a zinc oxide negative electrode material for a zinc-air battery and a preparation method thereof. The zinc oxide negative electrode material has a double coating layer structure; the double coating layer structure is: an inner coating layer is evenly distributed between the zinc oxide and the outer coating layer; the inner coating layer is a polymer Coating layer; the polymer used in the polymer coating layer is selected from one of the alkali-resistant polyacrylic acid, polymethacrylic acid or acrylic acid and methacrylic acid copolymer; the outer coating layer is hydrogen oxide Indium and / or tin dioxide layers. The preparation method is to modify the surface of zinc oxide with a silane coupling agent, and then deposit metal oxide and / or hydroxide with cyclohexamethylenetetramine to realize uniform coating of the outer coating layer. The invention effectively solves the problem that the cladding layer is easy to break and collapse caused by dendrite growth, deformation, and volume expansion caused by Zn / ZnO crystal transformation; and obtains a finished product with excellent rate performance and long cycle life.

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 used for an alkaline zinc-air secondary battery, 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 aqueous zinc-air battery is considered to be one of the most promising secondary metal-air batteries due to its advantages of simple battery structure, high energy density, easy storage, low cost, safety, environmental protection and no pollution. However, due to the high solubility of the negative electrode product zinc oxide, zinc-air battery anodes are prone to deformation and dendrite growth during charging, resulting in rapid discharge capacity decay and short battery cycle life, which greatly restricts commercial applications. [0003] In order to limit the dissolution of zin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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