TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The cathode includes a lithium rich metal oxide (LRMO). The LRMO cathode material is of formula (LixMyO2) or (LixNi1-a-bMnaCobO2). The amount of battery electrolyte solution is 3-6 g/Ah cathode capacity.x = greater than 1 to less than 2, preferably 1.01-1.15;y = 1;M = metal that has an oxidation state 2-4;a = 0.2-0.9; andb = 0.1-0.8.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The battery electrolyte solution comprises: 0.85-1 M of the lithium salt; and no more than 1 wt.% of polymerizable ethylenically unsaturated compounds and sulfur-containing compounds.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The nonaqueous solvent phase further comprises: at least one of linear alkyl carbonate, cyclic carbonate, cyclic ester, linear ester, cyclic ether, alkyl ether, nitrile, sulfone, sulfolane, siloxane and sultone; and at least one other carbonate solvent. The nonaqueous solvent phase includes at least one of ethylene carbonate, propylene carbonate, 4-fluoroethylene carbonate, 3,4-difluoroethylene carbonate, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate. The nonaqueous solvent phase comprises: a mixture of (a) 50-94 wt.% (2,2-difluoroethyl) ethyl carbonate, (b) 5-50 wt.% 4-fluoroethylene carbonate and (c) 1-50 wt.% dimethyl carbonate and/or diethyl carbonate (preferred), based on the combined weight of (a), (b) and (c); 50-90 wt.%, preferably 50-75 wt.% (2,2-difluoroethyl) ethyl carbonate, 5-30 wt.%, preferably 5-15 wt.% 4-fluoroethylene carbonate and 5-40 wt.% of dimethyl carbonate and/or diethyl carbonate, preferably 20-35 wt.% diethyl carbonate, based on the combined weight of these components; or 50-99 wt.%, preferably 75-85 wt.% (2,2-difluoroethyl) ethyl carbonate and 1-50 wt.%, preferably 15-25 wt.% 4-fluoroethylene carbonate, based on the combined weight of these components. The components (a), (b) and (c) comprise 95-100 wt.% of the nonaqueous solvent phase. EXAMPLE - Typical formulation comprised of: 90 wt.% 2,2-difluoroethyl ethyl carbonate; 10 wt.% 4-fluoroethylene carbonate; and 1.2 M lithium hexafluorophosphate.