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Efficient and stable bifunctional electrode material for zinc-air battery and preparation method and application thereof

A cathode material and electrospinning technology, applied in the field of dual-function air electrode materials, can solve the problems of low discharge current density, low cycle life, and restrictions on the development of a wide range of application fields, and achieve easy access, low price, and good catalytic properties. Effect

Active Publication Date: 2020-08-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the discharge current density of zinc-air batteries reported so far is relatively small, and the cycle life is low, which limits its wide application fields and further development of related industries.

Method used

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  • Efficient and stable bifunctional electrode material for zinc-air battery and preparation method and application thereof
  • Efficient and stable bifunctional electrode material for zinc-air battery and preparation method and application thereof
  • Efficient and stable bifunctional electrode material for zinc-air battery and preparation method and application thereof

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preparation example Construction

[0062] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0063] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0064] Instruments and equipment:

[0065] Co@Co prepared in the following examples x S y The powder diffraction pattern of / NC nanofibers is characterized by a MiniFlex II powder diffractometer; Co@Co prepared in the following examples x S y T...

Embodiment 1

[0067] Dissolve a certain amount of 4,4'-diaminodiphenyl ether (ODA) and an equivalent amount of 3,3',4,4'-biphenyltetracarboxylic dianhydride in N,N-dimethylacetamide In the (DMAc) flask, the solid content was 10wt.%. Stirring was continued at -3°C for 24h to obtain a spinning solution. The resulting spinning solution is packed into a syringe with a needle of 0.5 mm in diameter, and the syringe is facing the rotating metal collector (covered with aluminum foil), keeping the distance between the syringe needle (anode) and the rotating metal collector (cathode) at 20 cm , using an external power supply to apply a high voltage of 15kV to the syringe needle and the rotating metal collector. The plug flow rate was set to 0.2mL h -1 . The electrospun polyimide (PI) fibers were heated at room temperature at 1 °C min -1 The temperature was raised to 350 °C at a constant rate and maintained at this temperature for 1 h in an air atmosphere. Then change to nitrogen, at 5°C min -1 T...

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Abstract

The invention relates to a bifunctional electrode material for a zinc-air battery and a preparation method and application of the bifunctional electrode material. The electrode material is a nano carbon fiber porous material loaded with Co@CoxSy (x is greater than or equal to 0, y is greater than or equal to 0) nano particles; and the porosity of the surface and the synergistic effect between active sites and a carbon carrier greatly improve the utilization and conversion efficiency of energy in the rechargeable zinc-air battery, so that the material has a discharging function and a charging function at the same time. According to the Co@CoxSy / NC nanofiber prepared by the method, the raw materials are easy to obtain, the price is low, the preparation process is simple and convenient, and the chemical stability is good. The Co@CoxSy nano particles in the Co@CoxSy / NC nano fibers are relatively uniform in particle size, and can be uniformly distributed on the surface of the carbon nanofibers; the prepared Co@CoxSy / NC nanofibers have excellent electrochemical performance, the oxygen reduction catalytic reaction in an alkaline environment is basically a 4-electron reaction, and the ORRreaction in the zinc-air battery is promoted.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy, and discloses a dual-function air electrode material and its preparation and application. Background technique [0002] With the growth of the global economy, energy and environmental issues have become two major issues of global concern. In order to solve the energy crisis and alleviate the pressure of environmental pollution, it is imminent to seek a sustainable, clean and efficient new energy system. [0003] As a new type of chemical energy storage power source with high specific energy, large capacity, stable performance, low pollution, and safety and reliability, zinc-air battery has become a development hotspot in the energy field in the world today, showing a huge market prospect. Zinc-air batteries are widely used in navigation lights, unmanned observation stations, radio relay stations, etc. because they can provide a stable and small current for a long time. Zinc-air b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M4/96H01M12/06B82Y40/00
CPCB82Y40/00H01M4/8605H01M4/8652H01M4/8673H01M4/8825H01M4/90H01M4/9041H01M4/9083H01M4/96H01M12/06H01M2004/8689Y02E60/10
Inventor 郑维维周天华康遥张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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