High-specific-capacity and high-power alkaline aluminum-air battery electrolyte and preparation method thereof

An aluminum-air battery and electrolyte technology, which is applied in the field of electrochemistry, can solve the problems of reduced anode utilization, severe hydrogen evolution corrosion, and insufficient capacity density, and achieve the goal of increasing discharge current density, improving anode utilization, and increasing solution conductivity Effect

Pending Publication Date: 2022-01-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline electrolyte usually uses KOH or NaOH, Al(OH) 3 Further dissolution occurs to generate Al 3+ , so the discharge potential and current of the alkaline aluminum-air battery are higher than that of the neutral aluminum-air battery, but the hydrogen evolution corrosion of aluminum in the alkaline electrolyte is serious, resulting in a greatly reduced anode utilization rate and a capacity density of less than 800mAh / g Al , the utilization rate of aluminum negative electrode is only 20%~30%

Method used

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  • High-specific-capacity and high-power alkaline aluminum-air battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Configure potassium hydroxide aqueous solution, add zinc oxide, stir and dissolve, then add potassium fluoride, potassium citrate and potassium permanganate in sequence, and add polyethylene glycol after the solution is cooled, so that the composition of each substance in the prepared electrolyte Divided into:

[0017] Potassium hydroxide 37wt%, potassium fluoride 2.3wt%, potassium citrate 6wt%, zinc oxide 0.2wt%, polyethylene glycol 6mmol / L, potassium permanganate 0.2g / L, and the balance is water.

[0018] The prepared electrolyte is added to the aluminum-air battery, the negative pole is a 3N9 pure aluminum plate, the positive pole is a commercial air electrode, and the main components are manganese dioxide, acetylene black, and nickel mesh. Connect the positive and negative electrodes of the battery to the electrochemical workstation for data collection, and calculate the mass loss of the aluminum sheet before and after discharge. The test results are as follows:

...

Embodiment 2

[0021] Configure potassium hydroxide aqueous solution, add zinc oxide, stir and dissolve, then add potassium fluoride, potassium citrate and potassium permanganate in sequence, and add polyethylene glycol after the solution is cooled, so that the composition of each substance in the prepared electrolyte Divided into:

[0022] Potassium hydroxide 37wt%, potassium fluoride 2.3wt%, potassium citrate 6wt%, zinc oxide 0.2wt%, polyethylene glycol 4mmol / L, potassium permanganate 0.2g / L, and the balance is water.

[0023] The prepared electrolyte is added to the aluminum-air battery, the negative pole is a 3N9 pure aluminum plate, the positive pole is a commercial air electrode, and the main components are manganese dioxide, acetylene black, and nickel mesh. Connect the positive and negative electrodes of the battery to the electrochemical workstation for data collection, and calculate the mass loss of the aluminum sheet before and after discharge. The test results are as follows:

...

Embodiment 3

[0026] Configure potassium hydroxide aqueous solution, add zinc oxide, stir and dissolve, then add potassium fluoride, potassium citrate and potassium permanganate in sequence, and add polyethylene glycol after the solution is cooled, so that the composition of each substance in the prepared electrolyte Divided into:

[0027] Potassium hydroxide 37wt%, potassium fluoride 2.3wt%, potassium citrate 6wt%, zinc oxide 0.3wt%, polyethylene glycol 6mmol / L, potassium permanganate 0.2g / L, and the balance is water.

[0028] The prepared electrolyte is added to the aluminum-air battery, the negative pole is a 3N9 pure aluminum plate, the positive pole is a commercial air electrode, and the main components are manganese dioxide, acetylene black, and nickel mesh. Connect the positive and negative electrodes of the battery to the electrochemical workstation for data collection, and calculate the mass loss of the aluminum sheet before and after discharge. The test results are as follows:

...

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Abstract

The invention discloses an alkaline aluminum-air battery electrolyte with high specific capacity and high power and a preparation method thereof. The electrolyte comprises the following components: potassium fluoride, potassium permanganate, potassium citrate, polyethylene glycol, zinc oxide, potassium hydroxide and the balance of water. By compounding the electrolytes, the dissolution rate of the aluminum anode plate can be effectively increased, the hydrogen evolution reaction on the surface of the aluminum plate is remarkably inhibited, and the discharge current, the capacity density and the anode utilization rate of the aluminum air battery are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a high specific capacity, high power alkaline aluminum-air battery electrolyte and a preparation method thereof. Background technique [0002] Aluminum-air batteries react with aluminum plates and oxygen in the air, and have many advantages such as abundant resources, high theoretical discharge potential, and low cost. During the discharge process, the aluminum plate is oxidized, the oxygen in the air is reduced to generate OH-, and the electrons flow from the negative electrode to the positive electrode through the external circuit. [0003] Aluminum-air batteries are usually divided into two types: neutral and alkaline. The neutral electrolyte usually uses NaCl solution or seawater, because Al(OH) is easily generated on the surface of the aluminum plate. 3 Precipitation makes the conductivity low and the discharge potential low, so alkaline aluminum-air ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M12/02
CPCH01M12/06H01M12/02
Inventor 吴忠刘英杰胡文彬
Owner TIANJIN UNIV
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