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Magnesium-air battery cathode material and preparation method thereof

An anode material and air battery technology, applied in the direction of battery electrodes, fuel cell half-cells and secondary battery-type half-cells, circuits, etc., can solve the problem of reducing surface active area, reducing battery efficiency, and reducing battery discharge voltage, etc. problems, to achieve the effect of reducing the accumulation thickness, optimizing the discharge process, and excellent discharge performance

Active Publication Date: 2020-07-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the discharge reaction is in progress, a large amount of discharge products will be produced, which will reduce the active area of ​​the surface, reduce the discharge voltage of the battery, and reduce the efficiency of the battery

Method used

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  • Magnesium-air battery cathode material and preparation method thereof
  • Magnesium-air battery cathode material and preparation method thereof
  • Magnesium-air battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A magnesium-air battery anode material, the mass composition percentage of the anode material: Zn 2.0wt.%, Ca 0.1wt.%, the rest is magnesium.

[0026] (1) Take by weighing commercial pure magnesium (99.95wt.%), pure zinc (98.5wt.%), Mg-9.4wt.% according to the above-mentioned content Zn 2.0wt.%, Ca 0.1wt.%. %Ca intermediate alloy, and remove the oxide skin on the surface;

[0027] (2) Put the pure magnesium in (1) into a clean cast iron crucible and put them together in the hearth of a resistance furnace, preheat at 150°C for 20min to remove the moisture in the crucible, pure zinc and Mg-9.4wt. The %Ca master alloy is put into another clean cast iron crucible and put into another electric resistance furnace hearth, and is kept at a constant temperature of 300°C for standby;

[0028] (3) Raise the temperature of the resistance furnace with pure magnesium in (2) to 700°C, and feed a volume ratio of 19:1 (N 2 :SF 6 ) protective gas, when the melt temperature reaches 720...

Embodiment 2

[0031] A magnesium-air battery anode material, the mass composition percentage of the anode material: Zn 2.0wt.%, Ca 0.2wt.%, the rest is magnesium.

[0032] (1) Take by weighing commercial pure magnesium (99.95wt.%), pure zinc (98.5wt.%), Mg-9.4wt.% according to the above-mentioned content Zn 2.0wt.%, Ca 0.2wt.%. %Ca intermediate alloy, and remove the oxide skin on the surface;

[0033] (2) Put the pure magnesium in (1) into a clean cast iron crucible and put them together in the hearth of a resistance furnace, preheat at 200°C for 15min to remove the moisture in the crucible, pure zinc and Mg-9.4wt. The %Ca master alloy is put into another clean cast iron crucible and put into another electric resistance furnace hearth, and is kept at a constant temperature of 300°C for standby;

[0034] (3) Raise the temperature of the resistance furnace with pure magnesium in (2) to 710°C, and feed a volume ratio of 19:1 (N 2 :SF 6 ) protective gas, when the melt temperature reaches 725...

Embodiment 3

[0037]A magnesium-air battery anode material, the mass composition percentage of the anode material: Zn 2.0wt.%, Ca 0.5wt.%, the rest is magnesium.

[0038] (1) Take by weighing commercial pure magnesium (99.95wt.%), pure zinc (98.5wt.%), Mg-9.4wt.% according to the above-mentioned content Zn 2.0wt.%, Ca 0.5wt.%. %Ca intermediate alloy, and remove the oxide skin on the surface;

[0039] (2) Put the pure magnesium in (1) into a clean cast iron crucible and put them together in the hearth of a resistance furnace, preheat at 250°C for 15min to remove the moisture in the crucible, pure zinc and Mg-9.4wt. The %Ca master alloy is put into another clean cast iron crucible and put into another electric resistance furnace hearth, and is kept at a constant temperature of 300°C for standby;

[0040] (3) Raise the temperature of the resistance furnace with pure magnesium in (2) to 713°C, and feed a volume ratio of 19:1 (N 2 :SF 6 ) protective gas, when the melt temperature reaches 728°...

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Abstract

The invention discloses a magnesium-air battery cathode material and a preparation method thereof, and relates to the technical field of magnesium-air batteries. The magnesium-air battery cathode material comprises the following components in percentages by weight: 1.0-5.0wt% of Zn, 0.1-2.0wt% of Ca and the balance of magnesium. The preparation method comprises the following steps: (1) weighing pure magnesium, pure zinc and Mg-Ca intermediate alloy according to 1.0-5.0wt% of Zn, 0.1-2.0wt% of Ca and the balance of magnesium, and removing oxide skin on the surface; (2) placing an alloy treatedin the step (1) in a crucible to be preheated, and sequentially placing the alloy in the crucible to be melted; and (3) casting molten liquid in the step (2) in a metal mold at a proper temperature for cooling. According to the preparation method, a hydrogen evolution reaction of a metal cathode in an NaCl neutral solution is relieved, the discharging process is optimized at the forming position of the second phase of dotted Ca2Mg6Zn3, the stacking thickness of a discharging product on the surface of the cathode is reduced, and product falling is accelerated.

Description

technical field [0001] The invention relates to the technical field of magnesium-air batteries, in particular to an anode material for a magnesium-air battery with high anode efficiency and a preparation method thereof. Background technique [0002] In response to the depletion of fossil fuels and the increasingly serious pollution problems, safe and pollution-free magnesium-air batteries, as a new type of energy conversion and storage device, have attracted widespread attention. [0003] Magnesium alloy is not only the lightest structural material among metals, but also non-toxic, non-polluting and abundant in reserves. It is well known that the magnesium anode has a standard electrode potential (-2.37V vs. SHE), a high theoretical electrochemical equivalent (2200mAh g -1 ), higher energy density (6.800Wh·kg -1 ). After the battery is formed, the anode reactant is magnesium alloy, and the cathode reactant is oxygen in the air, which greatly saves the space inside the bat...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/03H01M4/46H01M12/08
CPCC22C1/03C22C23/04H01M4/466H01M12/08Y02E60/10
Inventor 李淑波李函杜文博赵晨辰王朝辉刘轲杜宪于子健
Owner BEIJING UNIV OF TECH
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