CN-117721353-B - Mg-Sr-In alloy anode material for magnesium air battery and preparation method thereof

Abstract

The invention provides an Mg-Sr-In alloy anode material for a magnesium air battery and a preparation method thereof, and relates to the technical field of anode materials. The magnesium-strontium alloy anode material for the magnesium air battery mainly comprises Sr, in and Mg, and is prepared by micro-alloying pure magnesium anode by doping proper amounts of Sr and In elements, so that the microstructure of the magnesium alloy is changed, the corrosion resistance of the anode of the magnesium air battery is enhanced, the reaction kinetics of the anode is activated, the anode activation area is maintained, the negative differential effect is inhibited, the self-corrosion hydrogen evolution is reduced, the discharge voltage of the battery is improved, the anode efficiency is improved while the discharge is stable, and the service life of the battery is remarkably prolonged. The Mg-Sr-In anode material has simple preparation process, low cost and convenient popularization and application, and can be used for high-power electric equipment.

Inventors

• JIANG HAITAO
• YU BOWEN
• WU YANXIN
• ZHANG YUN

Assignees

• 北京科技大学

Dates

Publication Date

20260505

Application Date

20231215

Claims (6)

1. 1. The Mg-Sr-In alloy anode material for the magnesium air battery is characterized by comprising the following chemical components In percentage by mass: 0.1-2.0 wt.% of Sr, 0.1-3.0 wt.% of In, and the balance of Mg and unavoidable impurities.
2. 2. The method for preparing the Mg-Sr-In alloy anode material for the magnesium air battery as claimed In claim 1, comprising the steps of: And melting the high-purity magnesium ingot, the high-purity indium ingot and the magnesium-strontium intermediate alloy In a protective atmosphere, stirring and standing, fishing out surface scum, carrying out heat preservation refining, casting after refining is finished, and cooling to obtain the as-cast Mg-Sr-In anode material.
3. 3. The method of claim 2, wherein the melting temperature is 700 ℃ to 780 ℃.
4. 4. The method according to claim 2, wherein the refining temperature is 720 ℃ and the refining time is 20 min.
5. 5. The method of claim 2, wherein the protective atmosphere is argon.
6. 6. Use of the Mg-Sr-In alloy anode material of claim 1 In the preparation of a magnesium air battery.

Description

Mg-Sr-In alloy anode material for magnesium air battery and preparation method thereof Technical Field The invention relates to the technical field of anode materials, in particular to an Mg-Sr-In alloy anode material for a magnesium air battery and a preparation method thereof. Background With the exhaustion of fossil energy and the increasing demand for clean energy, the metal-air battery has the advantages of high energy density and no pollution, and is a novel energy source with potential. Magnesium and its alloys are an ideal anode for metal-air batteries due to their negative standard electrode potential (-2.37 v vs. she) and high theoretical specific energy (6.8 kWh kg -1), and the reserve of magnesium ore in our country is ranked in front of the world, so that magnesium-air batteries have the advantages of low cost, safety, cleanliness, high theoretical discharge voltage and energy density, etc. making them novel energy storage and conversion devices with large-scale application potential. Magnesium air batteries generally employ neutral electrolytes such as NaCl solution, seawater, and the like. Magnesium and its alloy are oxidized into Mg 2+ in the discharging process, and output electrons to an external circuit, and oxidation reaction occurs at the cathode, so that oxygen in air and water in electrolyte are subjected to electron generation to generate OH -, which is the reaction principle of the magnesium air battery. However, in the practical use process, the application of the magnesium air battery in large-scale industrial production is severely limited. The limiting reasons are that the internal resistance of the battery system, such as anode, cathode polarization and the like, on the one hand, discharge products are adsorbed and accumulated on the surface of the anode to isolate the anode from electrolyte, so that the surface reaction area is reduced, and the practical use voltage is far smaller than the theoretical value. Meanwhile, in the discharging process, due to the active property of magnesium, the magnesium is easy to generate hydrogen evolution self-corrosion, so that the magnesium matrix is consumed invasively, and the anode efficiency is reduced. Therefore, there is a need to develop a magnesium alloy anode material with stable discharge, high discharge voltage and high anode efficiency so as to prolong the service life of a magnesium air battery and realize the application on high-power electric equipment. Disclosure of Invention In order to solve the problems, the invention provides the Mg-Sr-In alloy anode material for the magnesium air battery and the preparation method thereof, and the Mg-Sr-In alloy anode material is used as the anode material of the magnesium air battery, so that the discharge voltage and the anode efficiency of the battery can be improved while the discharge is stable, the service life of the battery is obviously prolonged, and the Mg-Sr-In alloy anode material can be applied to high-power electric equipment. The Mg-Sr-In alloy anode material for the magnesium air battery comprises the following chemical components In percentage by mass: 0.1-2.0wt% of Sr, 0.1-3.0wt% of In, and the balance of Mg and unavoidable impurities. Further, the total content of unavoidable impurities is less than 0.01wt.%. The preparation method of the Mg-Sr-In alloy anode material for the magnesium air battery comprises the following steps: And melting the high-purity magnesium ingot, the high-purity indium ingot and the magnesium-strontium intermediate alloy In a protective atmosphere, stirring and standing, fishing out surface scum, carrying out heat preservation refining, casting after refining is finished, and cooling to obtain the as-cast Mg-Sr-In anode material. Further, the melting temperature is 700 ℃ to 780 ℃. Further, the refining temperature is 720 ℃, and the refining time is 20min. Further, the protective atmosphere is argon. The magnesium strontium indium (Mg-Sr-In) alloy anode material for the magnesium air battery is used for preparing the magnesium air battery and is applicable to any shape In the use process. Further, the magnesium air battery device includes a Mg-Sr-In anode, an electrolyte, and a commercial cathode. The invention changes the microstructure of the magnesium alloy by doping proper amount of Sr and In elements into the pure magnesium anode for micro alloying. For as-cast Mg-Sr-In anode materials, strontium exists mainly In two forms, namely (1) a second phase Mg 17Sr2 exists In an alpha-Mg matrix, strip-shaped Mg 17Sr2 is distributed along grain boundaries, granular Mg 17Sr2 is distributed In crystals, and (2) a small amount of strontium is dissolved In the alpha-Mg matrix In an atomic form. The strontium element can form a SrO modified MgO/Mg (OH) 2 film layer in the discharge process, so that the corrosion resistance is enhanced and the discharge product is easy to peel off. Mg 17Sr2 can be used as a weak cathode to accelerate the discharge dissol