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Alkaline aqueous electrolyte for aluminum-air battery and its application

A water-based electrolyte, aluminum-air battery technology, applied in the direction of alkaline electrolyte, aqueous electrolyte, electrolyte, etc., can solve the problems of accelerating electrolyte gelation, complicating electrochemical reactions, accelerating battery failure, etc., and prolonging the discharge life , Facilitate large-scale promotion and application, and reduce the effect of hydrogen evolution self-corrosion rate

Active Publication Date: 2021-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of various composite additives may complicate the electrochemical reactions in the electrolyte
Specifically, after the battery is discharged for a long time, the battery gradually fails due to the gradual saturation of soluble aluminum salts and the precipitation of aluminum hydroxide.
Composite additives and a composite film detached from the interface may accelerate the gelation of the electrolyte, thereby accelerating battery failure

Method used

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  • Alkaline aqueous electrolyte for aluminum-air battery and its application
  • Alkaline aqueous electrolyte for aluminum-air battery and its application
  • Alkaline aqueous electrolyte for aluminum-air battery and its application

Examples

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Effect test

Embodiment 1

[0038] The high-concentration salt additive of the present embodiment is potassium acetate of 4mol / kg.

[0039] The aluminum-air battery electrolyte of this embodiment includes KOH, potassium acetate, and water; the mass molar concentration of potassium acetate in the electrolyte is 4 mol / kg, and the concentration of KOH is 4 mol / L.

[0040] The preparation method of the aluminum-air battery electrolyte of the present embodiment comprises the following steps:

[0041] Prepare a potassium hydroxide solution with a concentration of 4 mol / L, cool down to room temperature, then add potassium acetate in the prescribed amount into the potassium hydroxide solution, stir and sonicate until completely dissolved.

[0042] The aluminum-air battery of this embodiment uses the above-mentioned electrolyte solution for the aluminum-air battery.

Embodiment 2

[0044] The high concentration salt additive of embodiment is the potassium acetate of 8mol / kg.

[0045] The aluminum-air battery electrolyte of this embodiment includes KOH, potassium acetate, and water; the mass molar concentration of potassium acetate in the electrolyte is 8 mol / kg, and the concentration of KOH is 4 mol / L.

[0046] The preparation method of the aluminum-air battery electrolyte of the present embodiment comprises the following steps:

[0047] Prepare a potassium hydroxide solution with a concentration of 4 mol / L, cool down to room temperature, then add potassium acetate in the prescribed amount into the potassium hydroxide solution, stir and sonicate until completely dissolved.

[0048] The aluminum-air battery of this embodiment uses the above-mentioned electrolyte solution for the aluminum-air battery.

Embodiment 3

[0050] The high concentration salt additive of embodiment is the potassium acetate of 16mol / kg.

[0051] The aluminum-air battery electrolyte of this embodiment includes KOH, potassium acetate, and water; the mass molar concentration of potassium acetate in the electrolyte is 16 mol / kg, and the concentration of KOH is 4 mol / L.

[0052] The preparation method of the aluminum-air battery electrolyte of the present embodiment comprises the following steps:

[0053] Prepare a potassium hydroxide solution with a concentration of 4 mol / L, cool down to room temperature, then add potassium acetate in the prescribed amount into the potassium hydroxide solution, stir and sonicate until completely dissolved.

[0054] The aluminum-air battery of this embodiment uses the above-mentioned electrolyte solution for the aluminum-air battery.

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Abstract

The invention belongs to the technical field of fuel cells, and specifically discloses a high-concentration salt alkaline electrolyte, which contains high-concentration sodium potassium salt and alkali solution. The present invention also includes the application of using the electrolytic solution to prepare aluminum-air fuel cells. The invention also provides the alkaline electrolyte and the aluminum-air battery containing the electrolyte. The high-concentration sodium-potassium salt of the present invention can effectively inhibit the self-corrosion of the anode by inhibiting the activity of water molecules and increasing the activation energy of the hydrogen evolution reaction, so that the self-discharge of the battery can be greatly reduced, and at the same time, the discharge product of the battery can be shifted in time under cyclic conditions. Remove and recycle. When the high-concentration salt alkaline electrolyte is used for aluminum-air batteries, the corrosion inhibition efficiency can reach up to 93.55%, the specific capacity can reach up to 2412mAh / g, and the energy density can reach over 426Wh / kg. Under the same conditions, the battery life of this electrolyte is nearly 5 times that of the traditional electrolyte.

Description

technical field [0001] The invention relates to a high-concentration saline-alkali solution, an aluminum-air battery electrolyte, a preparation method thereof, and an aluminum-air battery, belonging to the field of aluminum-air batteries. Background technique [0002] With the development of modern society, people put forward higher requirements for the energy density, safety and sustainability of energy storage devices. Due to the high theoretical energy density of metal-air batteries (aluminum, zinc, magnesium, etc.), they have attracted more and more attention. Among all kinds of metal-air batteries, the theoretical specific capacity of aluminum-air batteries (2.98Ahg -1 ) is much larger than the theoretical specific capacity of the zinc-air battery (0.82Ahg -1 ) and the theoretical specific capacity (2.20Ahg-1) of the magnesium-air battery. Alkaline aluminum-air batteries usually consist of an aluminum metal anode, an air cathode, and an alkaline electrolyte (KOH or N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06
CPCH01M12/06H01M2300/0014H01M2300/0091
Inventor 唐有根吴圣安王海燕
Owner CENT SOUTH UNIV
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