Modified zinc oxide and preparation method and application thereof

A zinc oxide and modified technology, which is applied in the direction of fuel cell half-cells and primary battery-type half-cells, can solve the problems of large electrochemical polarization of the metal layer, large electrode polarization, and deterioration of electrode polarization. The preparation method is simple and convenient, the hydrogen evolution overpotential is improved, and the electrode internal resistance is reduced.

Inactive Publication Date: 2018-01-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing modified materials either have poor corrosion resistance, serious hydrogen evolution problems, poor cycle stability of the electrode, or worsen electrode polarization, which limits the cycle life of the battery.
[0004] In order to solve the dual problems of hydrogen evolution and large electrode polarization, the patent "A Zinc Oxide Anode Material for Zinc-air Battery and Its Preparation Method" proposes to add a hydrophilic layer to the metal modified layer with high hydrogen evolution overpotential to solve the surface problem. The problem of high ion diffusion resistance caused by the coating layer improves the cycle life of the electrode, but it cannot solve the problem of large electrochemical polarization caused by the metal layer itself, and the cycle life of the electrode is still limited

Method used

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  • Modified zinc oxide and preparation method and application thereof
  • Modified zinc oxide and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of modified zinc oxide:

[0053] (1) Evenly disperse 1.6g of zinc oxide powder (with a particle size of 2 to 3 microns) into 250mL of a solution containing 4.2mmol / L resorcinol and 1g of cetyltrimethylammonium bromide (water: ethanol v / v=2), add concentrated ammonia water while stirring, adjust the pH value to 9.8, after 30min, add formaldehyde (formaldehyde to phenol molar ratio: 2.5) at 35°C and react for 18h, then raise the temperature to 80°C to continue the reaction for 3h, and dissolve the product in water Wash with ethanol for 3 times to obtain zinc oxide coated with a phenolic resin layer with a thickness of 15 nm.

[0054] (2) Add 0.5 g of the product of step (1) to 120 mL of a solution in which 1.688 mmol / L isopropanol titanate is dissolved (ethanol: isopropanol v / v=1), stir and disperse for 30 min, and add 0.213 mL of ethyl titanate Diamine was reacted at 75°C. After 8 hours, the product was washed with ethanol three times, vacuum-dried for 10 h...

Embodiment 2

[0060] Preparation of modified zinc oxide:

[0061] (1) Evenly disperse 1g of zinc oxide powder (with a particle size of 2 to 3 microns) into a solution containing 250mL of 4.2mmol / L phenol and 0.8g of dodecyltrimethylammonium bromide (water:ethanol v / v=1 ), add 0.1mol / L potassium hydroxide solution while stirring, and adjust the pH value to 11.4. After 20 minutes, add glutaraldehyde (formaldehyde-phenol molar ratio: 1.5) at 40°C and react for 18 hours, then raise the temperature to 75°C to continue the reaction After 5 hours, the product was washed three times with water and ethanol in sequence to obtain zinc oxide coated with a phenolic resin layer with a thickness of 17 nm.

[0062] (2) Add 0.5g of the product of step (1) to 55mL solution (ethanol:isopropanol v / v=1.5) dissolved in 1.688mmol / L titanate n-propanol, stir and disperse for 60min, add 0.117mL ethylene The imine was reacted at 82°C. After 6 hours, the product was washed with ethanol three times, vacuum-dried for ...

Embodiment 3

[0066] Preparation of modified zinc oxide:

[0067] (1) Evenly disperse 1 g of zinc oxide powder (with a particle size of 2 to 3 microns) into a solution containing 250 mL of 6.3 mmol / L phenol and 0.9 g of dodecyltrimethylammonium chloride solution (water: ethanol v / v = 2), add concentrated ammonia water while stirring, adjust the pH value to 11.8, after 60 minutes, add formaldehyde (aldehyde, phenol molar ratio: 1.5) at 25°C and react for 10 hours, raise the temperature to 80°C and continue the reaction for 5 hours, and the product Filter and wash with water and ethanol three times to obtain zinc oxide coated with a phenolic resin layer with a thickness of 25 nm.

[0068] (2) Add 0.5 g of the product of step (1) to 100 mL of a solution in which 3.4 mmol / L isopropanol titanate is dissolved (ethanol: isopropanol v / v=1), stir and disperse for 30 min, and add 0.491 mL of ethyl alcohol Diamine was reacted at 75°C. After 8 hours, the product was washed with ethanol three times, va...

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Abstract

The invention relates to modified zinc oxide and a preparation method and application thereof, in particular to a zinc negative electrode material for an alkaline zinc-air secondary battery, and belongs to the field of an air battery. The modified zinc oxide comprises a zinc oxide inner core, a first coating layer and a second coating layer, wherein the first coating layer is coated on the zinc oxide inner core, the second coating layer is coated on the first coating layer, the material of the first coating layer is C, and the material of the second coating layer is a titanium sub-oxide. The preparation method of the modified zinc oxide comprises the steps of growing a layer of phenolic resin on a surface of zinc oxide in an in-situ way; coating a layer of titanium-based organic-inorganicmixed gel; and performing reaction at 760-880 DEG C to obtain the product with the designed structure. When the product is used as a zinc negative active material of the alkaline zinc-air secondary battery, the product shows excellent electrochemical performance. The material is reasonable in structural design, the preparation process is simple, the obtained product has favorable performance, andindustrial application on a large scale is convenient.

Description

technical field [0001] The invention relates to a modified zinc oxide and its preparation method and application, in particular to a zinc negative electrode active material used in an alkaline zinc-air secondary battery, which belongs to the field of air batteries. Background technique [0002] With people's emphasis on environmental protection, pollution-free electrochemical cells have received people's attention. The zinc-air secondary battery uses potassium hydroxide aqueous solution as the electrolyte, metal zinc as the negative electrode active material, and oxygen in the air as the positive electrode active material. It has the advantages of environmental protection, pollution-free, low cost, and safety. Furthermore, due to the low discharge platform of metal zinc, high specific capacity, and high energy density, zinc-air secondary batteries are one of the ideal secondary green, high-energy and environmentally friendly batteries that can be commercialized. However, zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06
CPCY02E60/10
Inventor 田忠良张志剑郭伟昌张红亮赖延清李劼
Owner CENT SOUTH UNIV
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