phosphate tris 2 chloroethyl phosphate tris 2 2 2 trifluoroethyl phosphate tripropyl phosphate triisopropyl phosphate tributyl phosphate trihexyl phosphate triphenyl phosphate tritolyl phosphate and combinations thereof other solvents may be used so long as they are non aqueous and aprotic and are capable of dissolving the solute salts in a preferred embodiment the solvent is selected from the group consisting of ethylene carbonate ec propylene carbonate pc dimethyl carbonate dmc ethyl methyl carbonate emc diethyl carbonate dec and combinations thereof in another embodiment the solvent comprises about 1 50 by volume vol ec and about 1 99 vol emc and about 1 99 vol dec in another embodiment the non aqueous solvent comprises ec emc and dec in a volume ratio of about 1 1 1 cathode the cathode comprises a lithium metal oxide compound in particular the cathode comprises at least one lithium mixed metal oxide mmo lithium mmos contain at least one other metal besides lithium typically this other metal is a transition metal preferably the transition metal is selected from the group consisting of mn co cr fe ni v and combinations thereof for example the following lithium mmos may be used in the cathode limno 2 limn 2 o 4 licoo 2 li 2 cr 2 o 7 li 2 cro 4 linio 2 lifeo 2 lini z co 1 u2212 z o 2 0 lt z lt 1 lifepo 4 li 3 vpo 4 limn 0.