Patent ID: 8637192

Claim:
A nonaqueous electrolytic solution comprising magnesium ions dissolved in an ether system organic solvent in which at least one of metal magnesium, alkyl trifluoromethanesulfonate having a general formula RCF 3 SO 3 , a quaternary ammonium salt having a general formula R 1 R 2 R 3 R 4 N + Z − and a 1,3-alkyl methylimidazolium salt having a general formula R(C 3 H 3 N 2 )CH 3 ] + X − are added to the ether system organic solvent; wherein in the general formula RCF 3 SO 3 , R is a methyl group or an ethyl group; wherein in the general formula R 1 R 2 R 3 R 4 N + Z − , each of R 1 , R 2 , R 3 , and R 4 is an alkyl group or an aryl group, and Z − is any one of a chloride ion (Cl − ), a bromide ion (Br − ), an iodine ion (I − ), an acetic acid ion (CH 3 COO − ), a perchloric acid ion (ClO 4 − ), a tetrafluoroboric acid ion (BF 4 − ), a hexafluorophosphoric acid ion (PF 6 − ), a hexafluoroarsenic acid ion (AsF 6 − ), a perfluoroalkylsulfonic acid ion (Rf1SO 3 − ) where Rf1 is a perfluoroalkyl group, and a perfluoroalkylsulfonyl imide ion ((Rf2SO 2 ) 2 N − ) where Rf2 is a perfluoroalkyl group; and wherein in the general formula [R(C 3 H 3 N 2 )CH 3 ] + X − , R is a methyl group, an ethyl group or a butyl group, and X − is any one of a tetrafluoroboric acid ion (BF 4 − ) and a bis(trifluoromethanesulfonyl)imide ion ((SO 2 CF 3 ) 2 N − ); wherein an aluminum halide having a general formula AlY 3 is added to the ether system organic solvent, wherein in the general formula AlY 3 , Y is any one of chlorine (Cl), bromine (Br), and iodine (I).