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Magnesium-air battery anode material and preparation method thereof

An air battery and anode material technology, which is applied in battery electrodes, fuel cell type half cells and secondary battery type half cells, circuits, etc., can solve the problem of reducing battery life, self-discharge and discharge loss, and reducing anode efficiency. and other problems, to achieve the effect of slowing the hydrogen desorption reaction, excellent discharge performance, and reducing the thickness of the stack

Inactive Publication Date: 2020-12-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, magnesium-air batteries still face many problems, mainly including low anode efficiency and slow oxygen reduction reaction kinetics at the cathode.
Among them, when the magnesium used as the anode is polarized to a value higher than its self-corrosion potential during the discharge process, it is very easy to self-corrode in the electrolyte, resulting in self-discharge and discharge loss, reducing the efficiency of the anode and reducing the service life of the battery.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A magnesium-air battery anode material, the mass composition percentage of the anode material: Al 2.8wt.%, Zn0.8wt.%, Gd 1.0wt.%, the balance is magnesium.

[0027] (1) according to above-mentioned content Al 2.8wt.%, Zn 0.8wt.%, Gd 1.0wt.%, balance is the mass percent of magnesium and takes commercial AZ31 magnesium alloy (Mg-3.1Al-0.82Zn-0.33Mn), Pure aluminum (99.99%), pure zinc (99.995%) and Mg-25wt.% Gd master alloy, and remove the surface oxide scale;

[0028] (2) Put the AZ31 magnesium alloy 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, remove the moisture in the crucible, pure zinc, pure aluminum and The Mg-Gd master alloy is placed in another electric resistance furnace and kept at a constant temperature of 250°C for standby;

[0029] (3) Heat up the resistance furnace of AZ31 magnesium alloy in (2) to 700°C, and feed a volume ratio of 97:3 (CO 2 :SF 6 ) protective gas, when th...

Embodiment 2

[0032] A magnesium-air battery anode material, the mass composition percentage of the anode material: Al 2.8wt.%, Zn0.8wt.%, Gd 2.5wt.%, the balance is magnesium.

[0033] (1) According to the above-mentioned content Al 2.8wt.%, Zn 0.8wt.%, Gd 2.5wt.%, the balance is the mass percentage of magnesium and takes commercial AZ31 magnesium alloy (Mg-3.1Al-0.82Zn-0.33Mn), Pure aluminum (99.99%), pure zinc (99.995%) and Mg-25wt.% Gd master alloy, and remove the surface oxide scale;

[0034] (2) Put the AZ31 magnesium alloy 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, remove the moisture in the crucible, pure zinc, pure aluminum and The Mg-Gd master alloy is placed in another electric resistance furnace and kept at a constant temperature of 250°C for standby;

[0035] (3) Heat up the resistance furnace of AZ31 magnesium alloy in (2) to 700°C, and feed a volume ratio of 97:3 (CO 2 :SF 6 ) protective g...

Embodiment 3

[0038] A magnesium-air battery anode material, the mass composition percentage of the anode material: Al 2.8wt.%, Zn0.8wt.%, Gd 5.8wt.%, the balance is magnesium.

[0039] (1) according to above-mentioned content Al 2.8wt.%, Zn 0.8wt.%, Gd 5.8wt.%, balance is the mass percent of magnesium and takes by weighing commercial AZ31 magnesium alloy (Mg-3.1Al-0.82Zn-0.33Mn), Pure aluminum (99.99%), pure zinc (99.995%) and Mg-25wt.% Gd master alloy, and remove the surface oxide scale;

[0040] (2) Put the AZ31 magnesium alloy 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, remove the moisture in the crucible, pure zinc, pure aluminum and The Mg-Gd master alloy is placed in another electric resistance furnace and kept at a constant temperature of 250°C for standby;

[0041] (3) Heat up the resistance furnace of AZ31 magnesium alloy in (2) to 700°C, and feed a volume ratio of 97:3 (CO 2 :SF 6 ) protective ...

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Abstract

The invention discloses a magnesium-air battery anode material and a preparation method thereof, and relates to the technical field of magnesium-air batteries. The magnesium-air battery anode materialis prepared from the components: 2.0-3.0 wt.% of Al, 0.8-1.1 wt.% of Zn, 1.0- 7.5 wt.% of Gd and the balance of magnesium. The preparation method comprises the following steps that (1) an AZ31 magnesium alloy, pure aluminum, pure zinc and an Mg-Gd intermediate alloy are weighted according to 2.0-3.0 wt.% of Al, 0.8-1.1 wt.% of Zn, 1.0- 7.5 wt.% of Gd and the balance of magnesium, and surface oxide skin is removed; (2) the metal and the alloy of which the oxide skin is removed in the step (1) are put into a preheated crucible, and heating is carried out to 700 DEG C until the metal and the alloy are molten; and (3) the solution in the step (2) is heated to 780 DEG C, the temperature is kept for 5 minutes, rapidly cooling is carried out to 720 DEG C, and the solution is cast into a graphitemold preheated to 200 DEG C for cooling. Hydrogen evolution reaction of a metal anode in a NaCl neutral solution is inhibited, the formation of a needle-like Al2Gd second phase optimizes the discharge process, the falling of discharge products on the surface of an electrode is accelerated, the peeling of anode metal particles is reduced, the discharge reaction area is increased, and the specificcapacity and power density are improved.

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 increasing demand for energy supply and the increasingly serious environmental pollution problems, safe and pollution-free magnesium-air batteries, as a new type of energy storage and conversion device, have attracted widespread attention. [0003] Magnesium alloy is not only the lightest metal structure material, but also non-toxic, non-polluting, abundant in reserves and low in price. Magnesium has a low standard electrode potential (-2.37V vs. SHE), a high theoretical specific capacity (2200m Ah g -1 ), higher energy density (6800mW h g -1 ) and low density (1.74g·cm -3 ) and other characteristics, it is an extremely ideal anode material for air batteries. When the battery is assembled, the anode reactan...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C23/06C22C1/03H01M4/46H01M12/08
CPCC22C1/03C22C23/02C22C23/06H01M4/466H01M12/08Y02E60/10
Inventor 熊伟李权于思荣刘瑛李京刘林毕晓健张凯朱光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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