A kind of composite corrosion inhibitor and its alkaline electrolyte and aluminum-air battery added with the composite corrosion inhibitor

Abstract

The invention belongs to the technical field of fuel cells and particularly discloses an electrolyte composite corrosion inhibitor comprising an alkyl glycoside and a tin source. The invention also includes the application of the composite corrosion inhibitor for the preparation of an alkaline electrolyte for a metal air fuel cell. The present invention also provides the alkaline electrolyte comprising the composite corrosion inhibitor and an aluminum air battery containing the electrolyte. The alkyl glycoside and the tin source of the invention have a synergistic effect, the hydrogen evolution can be effectively inhibited, the self-discharge of the battery can be greatly reduced, at the same time, the voltage of the battery can be raised to a certain extent. The electrolyte with the bestproportioning additive is used in the aluminum air battery, the corrosion inhibition efficiency can reach 94.14%, and the life of a battery with the electrolyte formula is extended by more than threetimes compared with that of a battery with an electrolyte without the additive.

Description

technical field [0001] The invention relates to an electrolyte composite corrosion inhibitor, an aluminum-air battery electrolyte and a preparation method thereof, and an aluminum-air battery, belonging to the field of aluminum-air batteries. Background technique [0002] Metal-air fuel cells are electrochemical energy conversion devices that directly convert chemical energy stored in metals (such as Mg, Al or Zn) into electrical energy. In recent years, metal-air fuel cells have attracted considerable attention because of their many unique advantages, such as their environmental friendliness and wide-ranging sources. Aluminum air fuel cell due to its high theoretical energy density (8100Whkg -1 ), mechanically rechargeable and recyclable products (i.e. Al(OH) 3 ) and is considered to be an attractive next-generation new battery. Furthermore, aluminum, the most geologically abundant metal, has a very negative thermodynamic electrode potential in alkaline media. These adv...

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Problems solved by technology

Although most single-type electrolyte corrosion inhibitors can reduce the self-corrosion rate of aluminum anode alloys, it is often at the expense of anode activity; they can simultaneously reduce the self-corrosion rate of aluminum anode alloys without affecting or even improving The active corrosion inhibitors for aluminum anodes are generally composite corrosion inhibitors, but most composite corrosion inhibitors have complex components. On the one hand, they will cause waste of materials and resources. On the other hand, some components may cause environmental pollution. Does not meet environmental protection requirements

[0005] Application publication number is CN 108023144A Chinese invention patent electrolyte corrosion inhibitor, aluminum-air battery electrolyte and its preparation method, the electrolyte corrosion inhibitor is mainly composed of inorganic phase-forming corrosion inhibitor and organic adsorption corrosion inhibitor , the molar ratio of the inorganic phase-forming corrosion inhibitor to the organic adsorption-type corrosion inhibitor is 50-0.003:1000-50, and the electrolyte disclosed in this patent includes a strong base and the above-mentioned electrolyte corrosion inhibitor. The corrosion rate of the anode is reduced to a certain extent, but the efficiency of the anode still needs to be further improved

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