Shin, Sunghee Kwak, Jin Hwan Oh, Si Hyoung Kim, Hyung-Seok Yu, Seung-Ho Hee-Dae Lim 2024-01-12T06:35:38Z 2024-01-12T06:35:38Z 2023-07-06 2023-06 1944-8244 https://pubs.kist.re.kr/handle/201004/79904 Practical applications of Mg-metal batteries (MMBs) have been plagued by a critical bottleneck─the formation of a native oxide layer on the Mg-metal interface─which inevitably limits the use of conventional nontoxic electrolytes. The major aim of this work was to propose a simple and effective way to reversibly operate MMBs in combination with Mg(TFSI)2-diglyme electrolyte by forming a Ga-rich protective layer on the Mg metal (GPL@Mg). Mg metal was carefully reacted with a GaCl3 solution to trigger a galvanic replacement reaction between Ga3+ and Mg, resulting in the layering of a stable and ion-conducting Ga-rich protective film while preventing the formation of a native insulating layer. Various characterization tools were applied to analyze GPL@Mg, and it was demonstrated to contain inorganic-rich compounds (MgCO3, Mg(OH)2, MgCl2, Ga2O3, GaCl3, and MgO) roughly in a double-layered structure. The artificial GPL on Mg was effective in greatly reducing the high polarization for Mg plating and stripping in diglyme-based electrolyte, and the stable cycling was maintained for over 200 h. The one-step process suggested in this work offers insights into exploring a cost-effective approach to cover the Mg-metal surface with an ion-conducting artificial layer, which will help to practically advance MMBs. English American Chemical Society Reversible Mg-Metal Batteries Enabled by a Ga-Rich Protective Layer through One-Step Interface Engineering Article 10.1021/acsami.2c20571 1 ACS Applied Materials & Interfaces, v.15, no.23, pp.28684 - 28691 ACS Applied Materials & Interfaces 15 23 28684 28691 N scie scopus 001006325900001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article ELECTROLYTE INTERPHASE LAYER LITHIUM-ION STRUCTURAL-ANALYSIS DENDRITE GROWTH MAGNESIUM SEI PASSIVATION DEPOSITION STABILITY CORROSION magnesium Mg-metal battery artificial layer passivation film Mg surface