We present a promising electrolyte candidate, Mg(TFSI)2 dissolved in glyme/diglyme, for future design of advanced magnesium (Mg) batteries. This electrolyte shows high anodic stability on an aluminum current collector and allows Mg stripping at the Mg electrode and Mg deposition on the stainless steel or the copper electrode. It is clearly shown that nondendritic and agglomerated Mg secondary particles composed of ca. 50 nm primary particles alleviating safety concern are formed in glyme/diglyme with 0.3 M Mg(TFSI)2 at a high rate of 1C. Moreover, a Mg(TFSI)2-based electrolyte presents the compatibility toward a Chevrel phase Mo6S8, a radical polymer charged up to a high voltage of 3.4 V versus Mg/Mg(2+) and a carbon-sulfur composite as cathodes.

More oxidative than carbonate solvents such as EC Oxidative additive with high HOMO energy HOMO energy of carbonate solvents such as EC e -Stable SEI layer Energy HOMO energy of high-voltage solvents such as sulfone, fluorinated solvents Highly stable electrolytes at high voltages (without the SEI formation on the cathode) Search for high-voltage electrolytes using HOMO energy calculation Possible candidates by theoretical molecular orbital calculation Screening oxidative additives or high-voltage solvents using electrochemical floating test and LSV/CV Finding the optimized electrolytes for high-voltage cathodes through electrochemical test of cellsWe present the useful processes in the research of functional electrolytes for interfacial stability of high-voltage cathodes in Li-ion batteries.Advanced electrolytes with unique functions such as in-situ formation of a stable artificial solid electrolyte interphase (SEI) layer on the anode and the cathode, and the improvement in oxidation stability of the electrolyte have recently gained recognition as a promising means for highly reliable lithium-ion batteries with high energy density. In this review, we describe several challenges of the cathode (spinel lithium manganese oxide (LMO), lithium cobalt oxide (LCO), lithium nickel cobalt manganese oxide (NCM), spinel lithium manganese nickel oxide (LNMO), and lithium-rich layered oxide (Li-rich cathode))-electrolyte interfaces and highlight the recent 10 progress in the use of oxidative additives and high-voltage solvents in high-performance cells. 75 solvents with high anodic stability, researchers have also investigated the use of functional oxidative additives to modify the surface chemistry of the cathode and attain high-performance cathodes for use in LIBs. [25][26][27] In this review, we present the problematic issues regarding 80

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