Patent ID: 8318354

Claim:
An electrochemical device, comprising: an anode comprising magnesium; a cathode comprising elemental sulfur as a major component of an active ingredient; and an electrolyte; wherein the electrolyte comprises an electrochemically active salt of a solvated cation species, prepared in a medium, the salt comprising a magnesium ion dimer of formula (V): [Mg 2 X 3 ] + (V) and an anion of formula (VI): [AlCl b R (4-b) ] − (VI) the electrochemically active salt having been crystallized, removed from the medium of preparation and redissolved in an ether solvent to obtain the electrolyte, wherein R is C 1 to C 10 alkyl, optionally substituted phenyl, NR 2 ″ or OR′″, R″ is C 1 to C 10 alkyl, optionally substituted phenyl, a polyaromatic group or SiR 3 ′″, R′″ is independently C 1 to C 10 alkyl or optionally substituted phenyl, X is F, Cl, Br or I, and b is 1,2, or 3.