Electrochemical cycling of Mg in Mg[TFSI]2/tetraglyme electrolytes
By Ma, Zheng; Kar, Mega; Xiao, Changlong; Forsyth, Maria; MacFarlane, Douglas R.
Published in Electrochemistry Communications
NULL
2017
Abstract
Abstract The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5 M Mg[TFSI]2 in tetraglyme in the presence of a small amount of Mg[BH4]2. The cyclic efficiency of the cathodic/anodic process was found to increase initially with [BH4]? then plateau at about 75% beyond 6 mM in these experiments. This concentration is in the region of that indicated by Karl Fischer analysis of the electrolyte as required of [BH4]? as a dehydrating agent. Cyclic voltammetry showed the reduction onset potential at approximately ? 0.35 V vs. Mg and subsequent oxidation around 0 V vs. Mg. Stable cyclic efficiency of approximately 75% over 500 cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500 cycles with cyclic efficiency > 73%.
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