TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: (I) has a ratio of cathode capacity to anode capacity of 2 or greater, preferably 2-3. The consistent charge and discharge cycling of (I) has no more than a 2.3% capacity loss after 12 continuous cycles at 133 degrees C.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The anode comprises a lithium intercalated electrode material, preferably lithium titanium oxide (Li4Ti5O12). The cathode comprises lithium manganese oxide compound of formula (LixMn2O4), lithium cobalt oxide (LixCoO2), modified lithium manganese oxide compound of formula (LixMn2O4) electrodes, lithium manganese copper oxide compound of formula (LixMn2-xCuxO4), lithium manganese oxide compound of formula (LiM(0.02)Mn(1.98)O4), a transition metal oxide or an electrochemically active conductive polymer. The cathode is lithium cobalt oxide (LiCoO2), or lithium iron phosphate (LiFePO4).M = B, Cr, Fe or Ti; andx = greater than 0.1 and less than 0.5.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The electrolyte comprises a binary salt mixture comprising a mixture of single salts, at least one of which contains the pyrazolium cation or the imidazolium cation. The binary salt mixture comprises a second cation which differs from the imidazolium cation. The second cation is in the form of the lithium salt comprising Li imide, Li bis(perfluoroethylsulfonyl)imide, Li methide or Li triflate. The imidazolium cation and the second cation are: each in the form of a salt and the two salts are different; and both in the form of a salt and at least one of the two salts comprises 1,3-dimethylimidazolium (DMI) bis(perfluoroethylsulfonyl)imide, 1-ethyl-3-methylimidazolium (EMI) bis(perfluoroethylsulfonyl)imide, DMI imide, EMI imide, DMI methide, EMI methide, DMI triflate or EMI triflate. The binary salt mixture comprises a second cation which differs from the pyrazolium cation. The pyrazolium cation and the second cation are: each in the form of a salt and the two salts are different; and both in the form of a salt and at least one of the two salts comprises 1,2-dimethylpyrazolium (DMP) bis(perfluoroethylsulfonyl)imide, 1-ethyl-2-methylpyrazolium (EMP) bis(perfluoroethylsulfonyl)imide, DMP imide, EMP imide, DMP methide, EMP methide, DMP triflate, or EMP triflate. The electrolyte comprises a ternary salt mixture comprising a mixture of three single salts, at least one of which contains the pyrazolium cation or the imidazolium cation. The ternary salt mixture comprises a second cation which differs from the imidazolium cation, and a third cation which differs from the imidazolium cation and the second cation. At least one of the second and third cations is in the form of the lithium salt comprising Li imide, Li bis(perfluoroethylsulfonyl)imide, Li methide and/or Li triflate. The imidazolium cation, the second cation, and the third cation are: in the form of a salt, and one of the anions of the three salts is different from the other two; and in the form of a salt, and the anions of the three salts are the same. The pyrazolium cation or the imidazolium cation, the second cation, and the third cation are in the form of a salt, and at least one of the three salts comprises DMP bis(perfluoroethylsulfonyl)imide, DMI bis(perfluoroethylsulfonyl)imide, EMP bis(perfluoroethylsulfonyl)imide, EMI bis(perfluoroethylsulfonyl)imide, DMP imide, EMP imide, DMI imide, EMI imide, DMP methide, DMI methide, EMP methide, EMI methide, DMP triflate, DMI triflate, EMP triflate, or EMI triflate. The imidazolium cation, the second cation, and the third cation are in the form of a salt, and at least one of the three salts comprises DMP bis(perfluoroethylsulfonyl)imide, DMI bis(perfluoroethylsulfonyl)imide, EMP bis(perfluoroethylsulfonyl)imide, EMI bis(perfluoroethylsulfonyl)imide, DMP imide, EMP imide, DMI imide, EMI imide, DMP methide, DMI methide, EMP methide, EMI methide, DMP triflate, DMI triflate, EMP triflate and another one of the three salts comprises Li bis(perfluoroethylsulfonyl)imide, Li imide, Li methide or Li triflate. The pyrazolium cation, and/or the imidazolium cation is present as a pyrazolium salt, an imidazolium salt, or a pyrazolium and imidazolium salts, together with dissolved lithium salts, which are distributed throughout a polymer matrix. The cation is an imidazolidine cation compound of formula (a1) or a pyrazolidine cation compound of formula (b1). The non-Lewis acid derived counterion is sulfonic acid anion compound of formula (R6SO3-), a nitrogen anion compound of formula (R7-SO2-N--SO2-R8), cyclic nitrogen anion compound of formula (c1), or carbanion compound of formula (R7-SO2-C-(R8-SO2)-SO2-R10). The electrolyte comprises an imidazolium or pyrazolium cation and a non-Lewis acid derived anion. The anode and the cathode have equal electrode area.R1, R2 = 1-12C alkyl;R3-R5 = H or 1-5C alkyl;R6-R8, R10 = 1-4C halogenated alkyl; andR9 = 2-6C halogenated alkylene.