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Electrode material, preparation method and application thereof, and sodium-air battery

An electrode material, air battery technology, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc. Issues such as reduced efficiency and stability

Pending Publication Date: 2021-04-20
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, a common challenge in current sodium-air batteries is the poor catalytic efficiency and stability of the air electrode.
The specific performance is as follows: first, the current catalysts have poor catalytic efficiency and cannot meet the energy efficiency of the battery during charging and discharging; second, the stability of the catalyst is not enough, and most oxides and carbon materials are easy to dissolve in acid-base solutions. Corrosion, which leads to a reduction in the catalytic efficiency and stability of the catalyst

Method used

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  • Electrode material, preparation method and application thereof, and sodium-air battery
  • Electrode material, preparation method and application thereof, and sodium-air battery
  • Electrode material, preparation method and application thereof, and sodium-air battery

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preparation example Construction

[0042] Some embodiments of the present invention also provide a preparation method of the above-mentioned electrode material, which includes:

[0043] S1. Preparation of a compound whose unit cell structure is a Prussian blue structure.

[0044] The specific preparation process is: reacting metal salt and ferrocyanate. During the reaction, a reaction occurs between ferrocyanate ions and metal ions to generate precipitates.

[0045] In some embodiments, in order to allow the metal salt and ferrocyanate to react, generally, the metal salt and ferrocyanate react in a solution system.

[0046] Specifically, the metal salt is first dissolved in a solvent, and then ferrocyanate is added for reaction to obtain a precipitate. Wherein, the solvent is generally water.

[0047]Wherein, the metal salt can be nickel salt, cobalt salt or iron salt; in some embodiments, the metal salt is nickel, cobalt, iron nitrate, sulfate or chloride. For example, the above metal salts may be nickel n...

Embodiment 1

[0061] This embodiment provides a method for preparing an electrode material, which specifically includes:

[0062] The Co-PBA Prussian blue structure was synthesized from cobalt nitrate and sodium ferrocyanide. Specifically, 6 mmol of cobalt nitrate was dissolved in 50 ml of deionized water to obtain solution A, 4 mmol of sodium ferrocyanide was dissolved in another 50 ml of deionized water, and stirred evenly to obtain solution B. Solution A was added dropwise to solution B and stirred for 30 min. The obtained solid was washed and centrifuged and dried to obtain a defect-free Co-PBA Prussian blue structure, which was named Co-PBA. Disperse the obtained solid material in 50ml of deionized water, add 5ml of hydrogen peroxide solution, stir for 0.3h, stir and centrifuge to obtain defect-rich nanoparticles, named D-Co-PBA.

Embodiment 2

[0064] This embodiment provides a sodium-air battery, which uses biphenyl sodium as a liquid anode, NASICON as a solid electrolyte, 0.1mol / L NaOH as an aqueous electrolyte, and D-Co-PBA+Pt / C as a catalyst, assembled to obtain The sodium-air battery.

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Abstract

The invention discloses an electrode material, a preparation method and an application thereof, and a sodium-air battery. A unit cell structure of the electrode material is a [Fe(CN)6] vacancy defect Prussian blue structure. The electrode material is used as an air electrode material to prepare the sodium-air battery so that a discharge platform, the energy density and a discharge capacity of the sodium-air battery can be effectively improved, higher conductivity can be provided to a certain extent, the internal resistance of the battery is reduced, and meanwhile, the corrosion of an electrolyte to an electrode is effectively reduced so that the performance of the battery is improved; and the material is great significance to commercialization of the sodium-air battery.

Description

technical field [0001] The invention relates to the technical field of air batteries, in particular to an electrode material, a preparation method and application thereof, and a sodium-air battery. Background technique [0002] With the rapid development of the automobile industry, the energy crisis and air pollution have become major issues restricting the sustainable development of the global economy. In order to improve the competitiveness of the automobile industry, ensure energy security and develop a low-carbon economy, the industrialization of new energy vehicles has become an international The strategic consensus of the industry and the major strategic needs of my country's technological development. Although the current power and energy storage systems of new energy vehicles are mainly lithium-ion batteries, due to the high initial purchase cost, long charging time (3-4) hours, and low specific energy density (150-200 Wh / kg), The commercialization bottlenecks such a...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08B82Y30/00B82Y40/00
Inventor 许冠南康瑶
Owner UNIVERSITY OF MACAU
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