Porous zinc electrode, preparation method thereof and zinc-air battery comprising porous zinc electrode

A zinc electrode and porous structure technology, applied in electrode manufacturing, primary battery electrodes, battery electrodes, etc., can solve problems such as affecting output current, low electron speed of zinc flakes, electrolyte leakage, etc. Conducive to circulation and diffusion, and the effect of increasing the amount of charge

Pending Publication Date: 2020-12-08
BEIJING TSINGHUA SOLAR SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But at the same time, the disadvantages of zinc-air batteries are less obvious, as shown in: (1) The use cost is relatively high, and the charging process is relatively complicated
Because zinc-air batteries are usually charged mechanically, it is required to take out the zinc electrode and charge it in a special charging tank. Only professionals can operate it, which brings trouble to use, and also increases labor costs, resulting in additional actual operating costs. higher value
(2) The actual service life is short, 1 to 2 years, which is not mainly due to the poor electrochemical performance of the battery, but the impact of the structure of the battery
For example, the shell of the battery is made of plastic covering the air electrode, not a complete plastic tank, so it brings difficulties to the sealing of the battery, and many batteries leak after a certain period of use.
Secondly, the zinc-air electrode must be made porous. The porous electrode can absorb oxygen, but at the same time, it can also absorb some carbon dioxide, which will cause the electrolyte to be carbonated, resulting in a significant decrease in the efficiency of the battery.
(3) The batch production process is not mature enough
This is mainly the manufacture of catalytic membranes and waterproof and breathable membranes, most of which require semi-mechanical operations, and there are some ma

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  • Porous zinc electrode, preparation method thereof and zinc-air battery comprising porous zinc electrode

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preparation example Construction

[0100] In a specific embodiment, the present invention provides a kind of preparation method of porous zinc electrode, and described preparation method comprises:

[0101] (1) Prepare electroplating solution: add water and stir ruthenium source, zinc source, electrolyte and additive, obtain electroplating solution after completely dissolving;

[0102] (2) Use a template with a three-dimensional network structure as the cathode, and zinc as the anode, insert it into the electroplating solution containing the ruthenium source and soak for 5-10 minutes, and then apply a current between the anode and the cathode, using constant current method, constant voltage method or pulse method for electroplating;

[0103] (3) Post-treatment: the template deposited with the zinc layer is rinsed and dried in sequence to obtain a porous zinc electrode.

[0104] The porous zinc electrode prepared by the above preparation method has a three-dimensional network structure, a porosity of 70-80%, an...

Embodiment 1

[0110] This embodiment provides a preparation method of a porous zinc electrode, the preparation method comprising:

[0111] (1) Preparation of electroplating solution: add water and stir ruthenium source, zinc source, electrolyte and additives, and obtain electroplating solution after completely dissolving. Wherein, the ruthenium source is ruthenium chloride, and the concentration of ruthenium chloride is 4.8mg / L. The zinc source is zinc oxide, and the concentration of zinc oxide is 50g / L. The electrolyte is ferrous sulfate, sodium sulfate, sodium chloride, potassium chloride and copper chloride, the concentration of ferrous sulfate is 20g / L, the concentration of sodium sulfate is 35g / L, and the concentration of sodium chloride is 25g / L. The concentration of potassium chloride is 20g / L, and the concentration of copper chloride is 15g / L. The pH of the plating solution was 2.

[0112] (2) With porous iron having a three-dimensional network structure as the cathode and zinc a...

Embodiment 2

[0120] This embodiment provides a preparation method of a porous zinc electrode, the preparation method comprising:

[0121] (1) Preparation of electroplating solution: add water and stir ruthenium source, zinc source, electrolyte and additives, and obtain electroplating solution after completely dissolving. Wherein, the ruthenium source is ruthenium sulfate, and the concentration of ruthenium sulfate is 4.8 mg / L. The zinc source includes zinc oxide and zinc sulfate, the concentration of zinc oxide is 25g / L, and the concentration of zinc sulfate is 30g / L.

[0122] The electrolyte is ferrous chloride, sodium chloride, potassium sulfate, copper sulfate and copper chloride, the concentration of ferrous chloride is 30g / L, the concentration of sodium chloride is 30g / L, and the concentration of potassium sulfate is 18g / L , the concentration of copper sulfate is 16g / L, and the concentration of copper chloride is 5g / L. The pH of the electroplating solution is 3;

[0123] (2) With p...

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Abstract

The invention provides a porous zinc electrode, a preparation method thereof and a zinc-air battery comprising the porous zinc electrode. The preparation method comprises the following steps: inserting a template with a porous structure as a cathode and zinc as an anode into an electroplating solution containing a ruthenium source, applying a current between the anode and the cathode for electroplating, and depositing a zinc layer on the surface of the template, and preparing the porous zinc electrode. The porous zinc electrode provided by the invention has a three-dimensional network-shaped porous structure, has obvious structural advantages compared with the traditional porous material with uniform aperture, and can be used as a metal anode of the zinc-air battery to further improve thecharge quantity of the zinc-air battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a porous zinc electrode, a preparation method thereof and a zinc-air battery comprising the same. Background technique [0002] With the rapid development of science and technology and the improvement of people's living standards, people continue to expand the use of battery products, and the consumption of batteries is increasing rapidly. At the same time, all kinds of new electronic products have more and more functions, more and more power, more and more energy consumption, and the requirements for battery varieties and performance are also constantly improving. At present, a large number of lead-acid batteries, lithium-ion batteries and nickel-metal hydride batteries are popular in the market. They either have low specific energy or high prices, which are difficult to meet market demand. [0003] Zinc-air batteries are a new type of chemical power source in which oxygen in t...

Claims

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Application Information

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IPC IPC(8): H01M4/12H01M4/04H01M4/06H01M4/86H01M12/06C25D3/22C25D5/18C25D7/00
CPCC25D3/22C25D5/18C25D7/00H01M4/0452H01M4/06H01M4/12H01M4/8657H01M12/06H01M12/065H01M2004/021
Inventor 钟洪伟宗保帅胡光宇
Owner BEIJING TSINGHUA SOLAR SYST
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