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- W3116306474 abstract "Mg batteries are attractive next-generation energy storage systems due to their high natural abundance, inexpensive cost, and high theoretical capacity compared to conventional Li-ion based systems. The high energy density is achieved by electrodeposition and stripping of a Mg metal anode and requires the development of effective electrolytes enabled by a mechanistic understanding of the charge-transfer mechanism. The magnesium aluminum chloride complex (MACC) electrolyte is a good model system to study the mechanism as the solution phase speciation is known. Previously, we reported that minor addition of Mg(HMDS)2 to the MACC electrolyte causes significant improvement in the Mg deposition and stripping voltammetry resulting in good Coulombic efficiency on cycle one and, therefore, negating the need for electrochemical conditioning. To determine the cause of the improved electrochemistry, here we probe the speciation of the electrolyte after Mg(HMDS)2 addition using Raman spectroscopy, 27Al nuclear magnetic resonance spectroscopy, and 1H–29Si heteronuclear multiple bond correlation spectroscopy on MACC + Mg(HMDS)2 at various Mg(HMDS)2 concentrations. Mg(HMDS)2 scavenges trace H2O, but it also reacts with MACC complexes, namely, AlCl4–, to form free Cl–. We suggest that although both the removal of H2O and the formation of free Cl– improve electrochemistry by altering the speciation at the interface, the latter has a profound effect on electrodeposition and stripping of Mg." @default.
- W3116306474 created "2021-01-05" @default.
- W3116306474 creator A5049886971 @default.
- W3116306474 creator A5062200407 @default.
- W3116306474 date "2020-12-24" @default.
- W3116306474 modified "2023-10-16" @default.
- W3116306474 title "Activating Magnesium Electrolytes through Chemical Generation of Free Chloride and Removal of Trace Water" @default.
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- W3116306474 doi "https://doi.org/10.1021/acsami.0c19053" @default.
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