A salt of the general formula: Mg2+(Lx)6(PF6)2 wherein each L is a ligand selected from dichloromethane, a cyclic ether; or a nitrile of the general formula R−C≡N. A preferred halomethane is dichloromethane. Preferred cyclic ethers are crown ethers. A preferred nitrile is acetonitrile. Preferably L is acetonitrile. A preferred salt is Mg(CH3CN)6(PF6)2. A method of making the salt comprises the steps: providing Mg metal, activating the Mg metal in a first dry solution comprising a first ligand solution (L1), treating the dry solution of activated Mg metal and L1 with NOPF6 in a second dry solution comprising a second ligand solution (L2), heating the treated Mg metal solution removing residual solvent under vacuum, and recrystallizing the remaining solid to form the salt, wherein Lx comprises a mixture of L1 and L2. The salt can be used as the salt in an electrolyte, or as an additive to an electrolyte, in a cell or battery.
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