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Dry charge type zinc air cell

A zinc-air battery, electric technology, applied in the direction of fuel cell type half cell and primary cell type half cell, etc., can solve the problems of battery leakage, corrosion, battery alkali creeping, etc., to simplify the production process, and the production process Obvious, prolonging the service life of the effect

Inactive Publication Date: 2006-12-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used non-dry charging alkaline zinc-air batteries use zinc paste as the negative electrode, and sufficient electrolyte solution has been added during the manufacturing and assembly process, which restricts its large-scale application in the field of portable mobile device power supplies. :
Due to the instability of the zinc electrode in the electrolyte, the battery self-discharges and hydrogen evolution corrosion occurs. Long-term storage will affect the electrical performance of the battery. It is also easy to cause problems such as leakage of the electrolyte solution of the battery
[0005] 2. There is a problem of carbonation of the electrolyte solution
The precipitation of carbonate on the air diffusion electrode will reduce the air diffusion performance and electrocatalytic performance of the air diffusion electrode, and will also affect the electrical performance of the battery
[0006] 3. There is a problem of water loss or moisture absorption
When the ambient humidity is high, the electrolyte solution is easy to absorb moisture, so that the electrolyte solution is diluted, resulting in a decrease in the alkalinity of the electrolyte solution, and at the same time causing a decrease in the conductivity of the electrolyte solution and prompting the battery to leak, etc.; when the ambient humidity When it is small, the solvent of the electrolyte solution will diffuse and evaporate to the external environment, which will cause the concentration of the electrolyte solution to become thicker, and even dry up to cause the battery to fail
[0007] 4. There are problems of alkali climbing and leakage
Because the alkaline electrolyte solution will permeate along the negatively charged metal surface, the battery will experience alkali climbing, which will affect the performance and quality of the battery

Method used

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  • Dry charge type zinc air cell
  • Dry charge type zinc air cell
  • Dry charge type zinc air cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Take 0.4gPbO, 0.2gIn 2 o 3 Mix with 20g of active zinc powder, and pass through a 200-mesh sieve after ball milling with a ball mill for 1 hour;

[0027] (2) Mix 0.412g of azodicarbonamide with the mixture in (1), add 0.4g of conductive carbon black and 0.4g of carboxymethyl cellulose (CMC), and stir and disperse evenly with a mixer;

[0028] (3) Pour the mixture in (2) into a mold covered with nickel foam, a conductive current collector, and dry press it into a mold-shaped zinc electrode under a pressure of 15MPa, and then heat it at 210°C for 25min to make pores The thermal decomposition of the agent creates pores for the zinc electrode.

[0029] The obtained porous zinc electrode is used as the negative electrode, and the traditional air diffusion electrode is used as the positive electrode to assemble into an AA-type dry-charged zinc-air battery, and the battery shell is provided with an electrolyte solution injection port. When in use, inject 40% KOH electro...

Embodiment 2

[0031] (1) Get 6gPbO, 3gCdO and 300g active zinc powder to mix, pass 50 mesh sieves with ball mill ball mill after 1 hour;

[0032] (2) Get 6.18g of azodicarbonamide and mix it with the mixture in (1), add 6g of conductive carbon black and 3g of carboxymethyl cellulose (CMC), 3g of polytetrafluoroethylene, stir and disperse evenly through a mixer;

[0033](3) Pour the mixture in (2) into a mold covered with a conductive current collector nickel sheet, dry press it into a mold-shaped zinc electrode under a pressure of 20 MPa, and then heat it at a temperature of 210°C for 25 minutes to make pores The thermal decomposition of the agent creates pores for the zinc electrode.

[0034] The obtained porous zinc electrode is used as the negative electrode, and the traditional air diffusion electrode is used as the positive electrode to assemble a square-shaped dry-charged zinc-air battery, and the battery shell is provided with an electrolyte solution injection port. When in use, inj...

Embodiment 3

[0036] (1) Get 0.1gPbO, 0.05gCdO and 5g active zinc powder to mix, pass 300 mesh sieves after ball milling 1 hour with ball mill;

[0037] (2) Mix 0.103g of azodicarbonamide with the mixture in (1), add 0.1g of conductive carbon black and 0.1g of carboxymethyl cellulose (CMC), and stir and disperse evenly with a mixer;

[0038] (3) Pour the mixture in (2) into a mold covered with a conductive current collector nickel mesh, dry press it into a mold-shaped zinc electrode under a pressure of 15MPa, and then heat it at 210°C for 20min to make pores The thermal decomposition of the agent creates pores for the zinc electrode.

[0039] The obtained porous zinc electrode is used as the negative electrode, and the traditional air diffusion electrode is used as the positive electrode to assemble an A675 button-type dry-charged zinc-air battery, and the battery case has an electrolyte solution injection port. When in use, inject 40% KOH electrolyte solution through the injection port in...

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Abstract

This invention relates to a dry charge Zn air battery including an electrolyte solution and an air diffusion electrode as the positive and a Zn electrode as the negative formed by dry-pressing active Zn powder at one run, the battery shell has an injection inlet for injecting electrolyte solution set at outside of the shell to be injected when using, the porous Zn electrode is formed by mixing inhibitor and Zn powder in the quality proportion of 1-5:100, then to mix the pore-former and mixture in the quality ratio of 1-8:100 to be dry-pressed to Zn electrode under 10-20Mpa and heated for 5-40min under 80-300deg.C

Description

technical field [0001] The invention relates to the technical field of zinc-air batteries, in particular to a dry-charged zinc-air battery. Background technique [0002] Zinc-air battery is a high-tech product in the current field of chemical power sources, known as "green energy for the 21st century". It is a chemical power source that uses oxygen in the air as the positive electrode active material, metal zinc as the negative electrode active material (usually zinc paste), and generates electrical energy through a chemical reaction under the catalysis of an electrocatalyst. Since air does not account for the volume and weight of the battery, the battery system theoretically has a high specific energy. Its theoretical specific energy is as high as 1350mWh / g, and its actual specific energy is over 300mWh / g. Zinc-air batteries are widely used in military radio transmitters, electric vehicles and other fields because of their cheap and easy-to-obtain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06
CPCY02E60/10
Inventor 周震涛赵晶
Owner SOUTH CHINA UNIV OF TECH
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