Details

Autor(en) / Beteiligte

• Ma, Zheng
• Kar, Mega
• Xiao, Changlong
• Forsyth, Maria
• MacFarlane, Douglas R.

Titel

Electrochemical cycling of Mg in Mg[TFSI]2/tetraglyme electrolytes

Ist Teil von

• Electrochemistry communications, 2017-05, Vol.78, p.29-32

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The electrochemical reversibility of magnesium was observed in an electrolyte consisting of 0.5M 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 6mM 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 −0.35V vs. Mg and subsequent oxidation around 0V vs. Mg. Stable cyclic efficiency of approximately 75% over 500cycles is demonstrated on a platinum substrate. Mg cycling on magnesium, copper and aluminium substrates all show stable cycling over 500cycles with cyclic efficiency >73%. •Reversible Mg electrochemistry is presented in Mg[TFSI]2/tetraglyme electrolytes.•Very low water content in electrolytes is essential for Mg deposition and stripping reversibility.•CV measurement on different substrates exhibited stable cycling over 500cycles.•Charge/discharge cycles on Cu showed stable coulombic efficiency around 75%.