Noh Woo-joo, Ph.D. candidate at KIST, Han Jong-hyun, postdoctoral researcher, Hwang Jin-yeon, Principal Researcher at Rumplifier (Former Senior Researcher at KIST), and Oh Si-hyung, Principal Researcher. Photo courtesy of KIST.
A know-how has been developed to beat the vulnerability to moisture, the principle weak spot of magnesium batteries, that are thought-about a next-generation various to lithium batteries.
The Korea Institute of Science and Technology (KIST) introduced on the ninth {that a} analysis workforce led by Dr. Oh Si-hyung, a Principal Researcher on the Energy Storage Research Center, has developed an ‘air-stable magnesium metallic anode’ that operates reliably in a standard atmospheric atmosphere. The analysis was printed in the worldwide educational journal ‘Nature Communications’ on the ninth of final month.
Magnesium is ample in seawater and the Earth’s crust, cheap, and chemically extra stable than lithium, ensuing in a decrease threat of fireside and explosion. It may retailer extra power in the identical quantity, making it a promising next-generation materials to switch lithium batteries.
Its weak spot is that even hint quantities of moisture in the air can immediately type a non-conductive movie on the electrode floor, blocking the battery response altogether. Previous analysis might solely be performed inside particular sealed gear that utterly blocks out moisture. This makes mass manufacturing tough attributable to excessive prices.
The analysis workforce adopted a technique of actively eradicating incoming moisture relatively than blocking it. By immersing the magnesium metallic in a particular answer referred to as ‘trimethyl phosphate’ for quarter-hour, an invisibly skinny protective layer is fashioned on the floor. This layer first reacts with and chemically decomposes any penetrating moisture whereas concurrently trapping the remaining moisture, stopping it from reaching the electrode floor. In essence, the protective layer offers with the moisture earlier than it may possibly attain the magnesium.
Conventional magnesium electrodes would instantly cease working even in the presence of hint moisture at ranges of simply tens of components per million (ppm), typical of dry indoor air. In distinction, the electrode coated with the protective layer developed by the analysis workforce charged and discharged stably in an atmosphere with over 6500 ppm of moisture, equal to humid indoor air. Under situations of 1050 ppm, its efficiency was maintained for over 1200 hours.
The workforce additionally demonstrated {that a} battery cell assembled in ambient air, with out the necessity for particular sealed gear to dam out moisture and oxygen, operated usually. This proves its potential to be used in normal manufacturing facility settings.
This know-how is critical as a result of it solves the moisture drawback—the most important impediment to the commercialization of magnesium batteries—with a easy dipping course of. It can considerably scale back manufacturing prices by eliminating the necessity for costly moisture-blocking gear, and its simplicity makes it straightforward to scale up for mass manufacturing.
Dr. Oh Si-hyung acknowledged, “By shifting from the conventional passive approach of blocking moisture to an active design strategy that removes it, we have overcome a key obstacle to the commercialization of magnesium batteries.” He added, “Given that the difficulty of moisture control has constrained the expansion of research, this technology will serve as a major catalyst for advancing magnesium battery studies.”
doi: 10.1038/s41467-026-70378-3
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