In:
Materials Research Express, IOP Publishing, Vol. 8, No. 12 ( 2021-12-01), p. 126531-
Abstract:
In this work, the self-corrosion and discharge performance of the as-cast Mg- x Sn ( 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 Mg 2 Sn 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 Mg 2 Sn phase dispersed in the matrix, which facilitates more uniform dissolution.
Type of Medium:
Online Resource
ISSN:
2053-1591
DOI:
10.1088/2053-1591/ac4439
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2021
detail.hit.zdb_id:
2760382-9
