Alkaline electrolyte for aluminum-air battery and aluminum-air battery

Abstract

The invention discloses an alkaline electrolyte for an aluminum-air battery and the aluminum-air battery. The alkaline electrolyte comprises a corrosion inhibitor and an alkaline electrolyte solution.The corrosion inhibitor is prepared by compounding sodium stannate, potassium citrate, high fructose corn syrup and potassium fluoride. The corrosion inhibitor can effectively reduce the self-corrosion rate and aluminum anode polarization of an aluminum plate and improve the discharge performance of the aluminum-air battery.

Description

technical field [0001] The invention relates to the technical field of aluminum-air batteries, in particular to an alkaline electrolyte for an aluminum-air battery and an aluminum-air battery using the electrolyte. Background technique [0002] Aluminum-air batteries use aluminum and oxygen in the air as electrode active materials, and have many advantages such as high electrochemical equivalent, abundant resources, and low price. During the discharge process, the aluminum anode is oxidized, electrons flow to the cathode through the external circuit, and oxygen enters the electrolyte through the air cathode to reach the reaction interface for a reduction reaction to release electric energy. The electrolyte is generally an alkaline solution, such as NaOH or KOH solution, etc., but the self-corrosion rate of aluminum in a strong alkaline solution is very high, which reduces the utilization rate of the anode, and the excessive final product Al(OH) 3 It will increase the polari...

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Problems solved by technology

[0003] In order to solve the above problems, the simplest and most effective method is to add a corrosion inhibitor to the electrolyte, the more commonly used is NaSnO 3 、In(OH) 3 , Ga(OH) 3 、K 2 MnO 4 Inorganic corrosion inhibitors, such as inorganic corrosion inhibitors, can reduce the self-corrosion rate of aluminum anodes to a certain extent, but it is often at the expense of anode activity, and the corrosion inhibition effect will gradually decrease with the dissolution of the aluminum plate during the discharge process.

In addition, such corrosion inhibitors usually have a high cost, and some components may cause environmental pollution and have certain toxic effects on the human body

Another type of corrosion inhibitor is an organic substance such as a surfactant, which mainly reduces the hydrogen evolution corrosion by covering the active sites on the aluminum surface. This method also reduces the activity of the aluminum anode

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