Electrolyte corrosion inhibitor for aluminum-air cell, electrolyte and preparation method

Abstract

The invention discloses an electrolyte corrosion inhibitor for an aluminum-air cell, an electrolyte and a preparation method, belonging to the technical field of chemical batteries. The electrolyte corrosion inhibitor mainly comprises sodium hyposulfite which has a concentration of 0.005 to 0.2 mol / L in the electrolyte and may further comprise the auxiliary additive sodium stannate which has a concentration of 0.01 to 0.03 mol / L in the electrolyte. The aluminum-air cell provided by the invention has the advantages of simple composition, low cost, safety and accordance with environmental protection requirements, can substantially reduce the hydrogen evolution self-corrosion rate of an aluminum anode, enables the open circuit potential of the aluminum anode and working potential under the condition of impressed current to undergo substantial negative transfer, allows an aluminum anode alloy to have good corrosion resistance and high electrochemical activity and meets the requirement of an alkaline aluminum-air cell for large current density discharging.

Description

technical field

[0001] The invention specifically relates to an electrolyte corrosion inhibitor for an aluminum-air battery, an alkaline electrolyte using the corrosion inhibitor and a preparation method thereof, belonging to the technical field of chemical batteries. Background technique

[0002] Due to the advantages of high efficiency and cleanliness, metal-air batteries will become one of the ideal power sources in the 21st century. my country has increased investment in research and development of metal-air batteries, especially aluminum-air batteries and zinc-air batteries. The aluminum-air battery uses the air electrode as the positive electrode, metal aluminum or aluminum alloy as the negative electrode, neutral or alkaline aqueous solution as the electrolyte, and O in the air 2 It reaches the gas-solid-liquid three-phase interface through the gas diffusion electrode and reacts with metal Al to release electric energy. The product is non-toxic and recyclable, which ...

Examples

Embodiment 1

[0035] The aluminum-air battery electrolyte mother solution in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.005 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0036] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corrosion rat...

Embodiment 2

[0039] The electrolyte mother solution for the aluminum-air battery in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.01 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0040] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corros...

Embodiment 3

[0043] The electrolyte mother solution for the aluminum-air battery in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.05 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0044] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corros...

technical field

[0001] The invention specifically relates to an electrolyte corrosion inhibitor for an aluminum-air battery, an alkaline electrolyte using the corrosion inhibitor and a preparation method thereof, belonging to the technical field of chemical batteries. Background technique

[0002] Due to the advantages of high efficiency and cleanliness, metal-air batteries will become one of the ideal power sources in the 21st century. my country has increased investment in research and development of metal-air batteries, especially aluminum-air batteries and zinc-air batteries. The aluminum-air battery uses the air electrode as the positive electrode, metal aluminum or aluminum alloy as the negative electrode, neutral or alkaline aqueous solution as the electrolyte, and O in the air 2 It reaches the gas-solid-liquid three-phase interface through the gas diffusion electrode and reacts with metal Al to release electric energy. The product is non-toxic and recyclable, which ...

Examples

Embodiment 1

[0035] The aluminum-air battery electrolyte mother solution in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.005 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0036] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corrosion rat...

Embodiment 2

[0039] The electrolyte mother solution for the aluminum-air battery in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.01 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0040] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corros...

Embodiment 3

[0043] The electrolyte mother solution for the aluminum-air battery in this embodiment is 4 mol / L sodium hydroxide solution, the corrosion inhibitor is sodium thiosulfate, and the concentration in the electrolyte is 0.05 mol / L. The preparation method of the electrolytic solution is as follows: prepare a sodium hydroxide solution with a concentration of 4 mol / L, cool to room temperature, add accurately weighed sodium thiosulfate, stir and dissolve completely.

[0044] The static self-corrosion rate of the Al-0.1Sn-0.1Ga aluminum anode alloy in the electrolyte prepared in this embodiment was tested by the gas collection method, and the test time was 30 minutes. The results are shown in Table 1 below. Using a three-electrode system to test the open circuit potential of the Al-0.1Sn-0.1Ga aluminum anode alloy in the above electrolyte and at 25°C, 100mA / cm 2 The working potential curve under the current density, the results are detailed in figure 1 , figure 2 . The self-corros...

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