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Zinc-air battery and preparation method and application thereof

A technology of air batteries and precursors, applied to battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc., can solve the problems of metal particle agglomeration, uneven dispersion, and CNT tube diameters. problems, to achieve the effect of large specific surface area, not easy to oxidize, and unique preparation method

Active Publication Date: 2021-03-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the core / shell structured TMA-NP / N-CNT composites synthesized by this method will have some non-negligible problems: the direct decomposition of the precursor mixture will lead to the agglomeration and uneven dispersion of metal particles, resulting in the growth The diameter of the CNT varies from thickness to thickness

Method used

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  • Zinc-air battery and preparation method and application thereof
  • Zinc-air battery and preparation method and application thereof
  • Zinc-air battery and preparation method and application thereof

Examples

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Synthetic example

[0030]Preparation of the precursor mixture: 3 g of urea (CO(NH2)2), 0.105 g of iron nitrate nonahydrate (Fe(NO3)3·9H2O), 0.075 g nickel nitrate hexahydrate (Ni(NO3)2·6H2O) and 20 mL of ultrapure water were added to the beaker, and dissolved under normal stirring at room temperature; then the beaker was transferred to the refrigerator to freeze at -18°C for 12 h, and then freeze-dried in a freeze dryer at -50°C for 24 h to obtain Precursor mixture powder containing C, N, Fe, and Ni.

[0031]Fill the small corundum boat with the above precursor mixture powder, and buckle it upside down in the middle of the big corundum boat; then put two clean 2*5 cm pieces2The cotton pieces are placed on the vacant parts of the large corundum boat at both ends, and contact the outer side of the small corundum boat.

[0032]At room temperature, transfer the above-mentioned upside-down corundum boat assembly with cotton cloth to the middle of the tube furnace, and calcinate in a nitrogen atmosphere at 10 ℃ / m...

Embodiment 1

[0038]The liquid zinc-air battery is composed of carbon paper with electrocatalyst as the air electrode, metal Zn sheet as the negative electrode, and 6.0 M KOH aqueous solution containing 0.2 M zinc acetate as the electrolyte. The electrocatalyst is dripped onto the carbon paper with a loading amount of 1.0 mg cm-2Specifically, 4 mg of three-dimensional carbon nanotube jungle, 1 mg of acetylene black, 50 μL of adhesive Nafion, and 2 mL of ethanol were mixed and dropped on carbon paper, and dried in a conventional environment to obtain an air electrode. Assemble the two electrode sheets with three different acrylic plates and screws into a liquid-box battery. The performance of the zinc-air battery is mainly carried out on the Landian LANDCT2001A. The constant current discharge curve can be obtained by testing the relationship between voltage and time at a constant current density, and charging and discharging can be obtained by repeated charging and discharging at a fixed capacity....

Embodiment 2

[0051]Preparation of the precursor mixture: 3 g of urea (CO(NH2)2), 0.105 g of iron nitrate nonahydrate (Fe(NO3)3·9H2O), 0.075 g nickel nitrate hexahydrate (Ni(NO3)2·6H2O) and 20 mL of ultrapure water were added to the beaker, and dissolved under normal stirring at room temperature; then the beaker was transferred to the refrigerator to freeze at -18°C for 12 h, and then freeze-dried in a freeze dryer at -50°C for 24 h to obtain Precursor mixture powder containing C, N, Fe, and Ni.

[0052]Fill the small corundum boat with the above precursor mixture powder, and buckle it upside down in the middle of the big corundum boat; then put two clean 2*5 cm pieces2The cotton pieces are placed on the vacant parts of the large corundum boat at both ends, and contact the outer side of the small corundum boat.

[0053]At room temperature, transfer the above-mentioned upside-down corundum boat assembly with cotton cloth to the middle of the tube furnace, and calcinate in a nitrogen atmosphere at 2.5 ℃ / ...

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Abstract

The invention discloses a zinc-air battery and a preparation method and application thereof. A three-dimensional carbon nanotube jungle composite material is used as an oxygen reduction reaction (ORR)and oxygen evolution reaction (OER) electrocatalyst, the three-dimensional carbon nanotube jungle composite material is loaded on a conductive substrate to be used as an air electrode, and then the air electrode, an electrolyte and a negative electrode conventionally form the zinc-air battery. The invention provides a new way for preparing the efficient and controllable three-dimensional CNT through adopting a one-step pyrolysis gas phase method. The pipe diameter of the CNT and the particle size of the embedded metal particles are fine and uniform and are uniformly dispersed, and the CNT hasa large specific surface area and rich micro / nano hole channels, so that more active sites and substance transmission can be exposed, extremely small overpotential and excellent stability are shown in ORR and OER processes, and the material is successfully applied to the ZAB as a positive electrode catalyst, and shows good cycling stability and relatively small potential polarization.

Description

Technical field[0001]The invention relates to a type of zinc-air battery prepared from a new type of three-dimensional carbon nanotube jungle that can be used as an electrocatalyst for a zinc-air battery.Background technique[0002]Zinc-air battery (ZAB) is considered to be the next generation energy storage power source with great potential due to its high theoretical energy density, environmental friendliness, high safety and low cost. Among them, the oxygen reduction reaction (ORR) involved in the discharge process and the oxygen evolution reaction (OER) during the charging process are the two key electrochemical processes of rechargeable ZAB. Since both ORR and OER involve slow multi-electron transfer reaction kinetics, there is an urgent need to develop stable and efficient bifunctional oxygen catalysts for use in rechargeable ZAB. Although platinum-based materials are currently used commercially as ORR catalysts and iridium / ruthenium-based materials as OER catalysts, these noble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06
CPCH01M4/9083H01M4/8878H01M12/06
Inventor 杨瑞枝郑祥俊
Owner SUZHOU UNIV
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