Microstructure and battery performance of Mg-Zn-Sn alloys as anodes for magnesium-air battery

Pei

J. Electrochem. Sci. Technol

et al. 2022

The effect of solution-treated on the self-corrosion performance and discharge performance of AZ91 magnesium alloy as anode material was analyzed by microscopic characterization, immersion tests, electrochemical measurements, and discharge performance tests. The study shows that the β-phase in the AZ91 magnesium alloy gradually dissolved in the matrix with the increase of the solution temperature, and the electrochemical activity of the magnesium alloy anode was significantly improved. Through the comparison of three different solution-treated processes, it is found that the AZ91 magnesium alloy has the most vigorous activity and better discharge performance after solution-treated of 415 o C+12 h. In addition, the proportion and distribution of β-phase AZ91 magnesium alloy have a direct impact on its discharge performance as an anode material.

Section: Electrochemical Analysismentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Solution-treated on Electrochemical Properties of AZ91 Magnesium Alloy Anode

Pei

J. Electrochem. Sci. Technol

et al. 2022

“…When the current density is greater than 2.5 mA cm −2 , the average discharge voltage of the Mg-9Sn anode exceeds the Mg-5Sn anode due to the cracks in the discharge product film, which ensures the contact between the electrolyte and the anode surface [9]. In addition, with the increase of Sn content, the volume fraction of the Mg 2 Sn phase increases, which accelerates the dissolution of the Mg anode and significantly improves the discharge performance of the Mg-air battery [47].…”

Section: Performance Of Mg-air Batteriesmentioning

confidence: 99%

Electrochemical behaviors and discharge performance of Mg-Sn binary alloys as anodes for Mg-air batteries

Han

Zhang

Guo

et al. 2021

Mater. Res. Express

In this work, the self-corrosion and discharge performance of the as-cast Mg-xSn (x=1, 5, 9 wt.%) anodes for primary Mg-air batteries were studied through microstructure characterization, electrochemical testing and discharge experiments. With the increase of Sn content, the volume fraction of the Mg2Sn phase increases, promoting dendrite refining. According to the electrochemical test, the Mg-1Sn anode shows a higher open circuit potential, resulting in a stronger electrochemical activity. The polarization curve and electrochemical impedance spectra show the corrosion resistance order as Mg-1Sn>Mg-5Sn>Mg-9Sn. In the discharge measurement, the Mg-1Sn anode achieves the best average discharge voltage, anode efficiency, specific capacity, and energy density under all current densities tested. At 10 mA cm-2, the energy density of Mg-1Sn is 1239.621 mWh g-1, which is higher than the Mg-5Sn anode and Mg-9Sn anode, 37% and 25%, respectively. The optimal discharge performance of the Mg-1Sn anode is mainly attributed to the high electrochemical activity and the micron-sized Mg2Sn phase dispersed in the matrix, which facilitates more uniform dissolution.

“…Meanwhile, the Mg anode and electrolyte can be mechanically replaced to make it "refuellable". [3,6,[10][11][12][13][14] However, the sluggish kinetics of oxygen reduction reaction (ORR) at the air cathode is one of the biggest challenges for Mg-air batteries and seriously impends the practical applications. [15][16][17][18] It is crucial to develop effective catalysts to accelerate the ORR kinetics for boosting the performance of Mg-air batteries.…”

Section: Introductionmentioning

confidence: 99%

“…The primary Mg‐air batteries are usually utilized in aqueous electrolytes and endlessly breathed oxygen from the atmosphere as reactants at the cathode, contributing to the extremely high energy density. Meanwhile, the Mg anode and electrolyte can be mechanically replaced to make it “refuellable” [3,6,10–14] . However, the sluggish kinetics of oxygen reduction reaction (ORR) at the air cathode is one of the biggest challenges for Mg‐air batteries and seriously impends the practical applications [15–18] .…”

Section: Introductionmentioning

confidence: 99%

Bimetallic CuCo@Nitrogen/Carbon Nanoparticles as a Cathode Catalyst for Magnesium‐Air Batteries

Dong

Wang

et al. 2022

ChemElectroChem

Mg‐air batteries are regarded as one of the most promising electrochemical energy storage and conversion devices. Developing high‐performance, low‐cost and durable non‐noble metal electrocatalysts for oxygen reduction reaction (ORR) at cathode is extremely critical for promoting the practical applications of Mg‐air batteries. The bimetallic M−N−C catalysts possess the superior ORR activity and stability due to the synergetic effect of metal atoms. Herein, prussian blue analogues (PBA) were employed as precursors to prepare bimetallic M−N−C electrocatalysts. The CuCo@N/C and Co@N/C were derived from CuCo−PBA and CoCo−PBA calcined under different temperatures. The bimetallic CuCo@N/C nanoparticles pyrolyzed at 800 °C (CuCo@N/C‐800) displays superior ORR performances and outstanding stability in alkaline and neutral electrolytes. The primary Mg‐air batteries assembled with the CuCo@N/C‐800 as the cathode catalyst displays better discharge performances than that of Co@N/C‐800. This work provides an effective strategy to synthesize bimetallic and non‐noble ORR catalysts for Mg‐air batteries.