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A kind of aluminum-air battery electrolyte and its preparation

An air battery and electrolyte technology, which is applied in primary batteries, alkaline electrolytes, aqueous electrolytes, etc., can solve the problems that limit the commercial development of alkaline aluminum-air batteries, anode corrosion, hydrogen evolution, and reduced Coulombic efficiency, etc. Anode hydrogen evolution self-corrosion rate, increase discharge power, and prolong the effect of battery life

Active Publication Date: 2019-02-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum is an active amphoteric metal material, and its surface protective film is easily dissolved in alkaline medium, but at the same time, it will also lead to severe hydrogen evolution at the anode corrosion, greatly reducing its Coulombic efficiency, which limits the commercial development of alkaline aluminum-air batteries

Method used

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  • A kind of aluminum-air battery electrolyte and its preparation

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Comparison scheme
Effect test

Embodiment 1

[0021] Weigh and mix 0.70g of sodium stannate, 0.08g of casein, 0.01g of polyoxyethylene sorbitan monostearate and 0.03g of sorbitan monostearate in the corrosion inhibitor, add to 50mL 4mol / LNaOH solution, stirred in a constant temperature water bath at 70°C for 10 minutes to dissolve evenly, and cooled to room temperature to obtain an alkaline electrolyte containing an anode corrosion inhibitor for alkaline aluminum-air batteries.

[0022] The static hydrogen evolution self-corrosion rate of the Al-0.2Mg-0.11Ga-0.1Sn alloy in the electrolyte prepared in this embodiment was tested by the gas collection experiment. The test time was 60 minutes. The results are shown in Table 1.

Embodiment 2

[0024] Mix 0.64g of sodium stannate, 0.08g of casein, and 0.04g of polyoxyethylene sorbitan monostearate in the corrosion inhibitor, add to 50mL of 4mol / L NaOH solution, stir in a constant temperature water bath at 70°C for 10 minutes, Dissolve evenly and cool to room temperature to obtain an electrolyte containing an anode corrosion inhibitor for alkaline aluminum-air batteries.

[0025] The static hydrogen evolution self-corrosion rate of the Al-0.2Mg-0.11Ga-0.1Sn alloy in the electrolyte prepared in this embodiment was tested by the gas collection experiment. The test time was 60 minutes. The results are shown in Table 1.

Embodiment 3

[0027] Mix 0.54g of sodium stannate, 0.06g of casein, 0.01g of polyoxyethylene sorbitan monostearate and 0.01g of sorbitan monostearate in the corrosion inhibitor, and add to 50mL 4mol / L NaOH solution , Stir in a constant temperature water bath at 70°C for 10 minutes to dissolve evenly, and cool to room temperature to obtain an electrolyte containing an anode corrosion inhibitor for an alkaline aluminum-air battery.

[0028] The static hydrogen evolution self-corrosion rate of the Al-0.2Mg-0.11Ga-0.1Sn alloy in the electrolyte prepared in this embodiment was tested by the gas collection experiment. The test time was 60 minutes. The results are shown in Table 1. Using a three-electrode system to measure the open circuit potential of the alloy in the above electrolyte at room temperature, the results are detailed in figure 1 .

[0029] From figure 1 It can be seen that the open circuit potential of the above-mentioned alloy in the electrolyte of this embodiment is -1.785V, whi...

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Abstract

An aluminum-air battery electrolyte, comprising an alkaline electrolyte solution and a corrosion inhibitor; the corrosion inhibitor is composed of an inorganic corrosion inhibitor, casein and a defoamer. The inorganic corrosion inhibitor is one or more of sodium stannate and zinc oxide. Described defoamer is polyoxyethylene polyoxypropanol amine ether, polyoxypropylene glyceryl ether, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene sorbitan monostearate, sorbitan monostearate One or a mixture of two or more esters. The aluminum-air battery electrolyte of the present invention has the advantages of low cost, high safety, and environmental protection. At the same time, it can not only significantly reduce the hydrogen evolution self-corrosion rate of the anode, but also cause a large negative shift of the open circuit potential of the aluminum anode, making the aluminum The anode has both good corrosion resistance and high electrochemical activity. It is of great significance to prolong battery life and increase discharge power.

Description

technical field [0001] The invention belongs to the technical field of metal-air batteries, and specifically relates to an aluminum-air battery electrolyte; the invention also relates to a preparation method of the aluminum-air battery electrolyte. Background technique [0002] Aluminum-air batteries use metal aluminum or its alloys as the anode fuel, oxygen in the air as the oxidant, salt water (NaCl aqueous solution) or strong alkali solution (NaOH, KOH, etc.) as the electrolyte, and convert the chemical energy of the metal fuel directly into electrical energy. An electrochemical reaction device. The main features of the aluminum-air battery are: high theoretical energy density (8100Wh / kg), as long as the metal fuel is continuously supplied, the battery can continuously and stably provide electric energy. The metal anode can be replaced mechanically, and the battery can be stored in a dry state for a long time. The preparation of the battery does not use harmful materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06H01M6/04
CPCH01M6/045H01M12/06H01M2300/0014
Inventor 孙公权聂玉娟王二东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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