TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - (Preparation): (I) (where x and y are not 0) is prepared by fluorinating hydridodecaborates in liquid medium to provide a fluorododecaborate (having at least 5, usually at least 8 or at least 10 but |) 12 hydrogen atoms replaced with fluorine); followed by metathesis using lithium hydroxide; and optionally further halogenating the partially fluorinated hydridodecaborate. Preferred Electrolyte: The electrolyte further comprises at least one from lithium hexafluoro phosphate, lithium perchlorate, lithium hexafluoroarsenate, lithium trifluoromethylsulfonate, lithium tetrafluoroborate, lithium bromide or lithium hexafluoroantimonate. The electrolyte comprises a gel and at least one polymer solvent (s2).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: (s1) is at least one from organic carbonate, ester, ketone or nitrite (preferably dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, dipropyl carbonate, bis(trifluoroethyl) carbonate, bis(pentafluoropropyl) carbonate, trifluoroethyl methyl carbonate, pentafluoroethyl methyl carbonate, heptafluoropropyl methyl carbonate, perfluorobutyl methyl carbonate, trifluoroethyl ethyl carbonate, pentafluoroethyl ethyl carbonate, heptafluoropropyl ethyl carbonate, perfluorobutyl ethyl carbonate, fluorinated oligomer, dimethoxyethane, triglyme, dimethylvinylene carbonate, tetraethyleneglycol, dimethyl ether, polyethylene glycol, sulfone or gamma-butyrolactone).    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: (s2) is polyether, polyethylene oxide, polyimide, polyphosphazine, polyacrylonitrile, polysiloxane, polyether grafted polysiloxane or their derivative, copolymer, crosslinked or network structures. SPECIFIC COMPOUNDS - 12 compounds are specifically disclosed as (I) e.g. Li2B12F11H.    EXAMPLE - K2B12F3H9 (3.78 g) mixture was dissolved in 1 M hydrochloric acid (100 ml). The mixture was heated to 100degreesC and chlorine gas was bubbled through the mixture. The effluent was passed through a solution of potassium hydroxide and sodium sulfite. After 8 hours of bubbling of chlorine gas, the solution was purged with air. The precipitate formed was filtered out. The solution was brought to a pH of 9 by the addition of triethyl amine. The solution was cooled to 0degreesC to maximize precipitation and then filtered, washed with cold water and dried in a vacuum to give Li2B12F3Cl9.