TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Adsorbent: Suitable carriers include silicon dioxide (SiO2). The adsorbent is a base with amino (NH2) groups fixed to a SiO2 matrix by propylene groups.Preferred Method: The adsorbent is added to the finished mixed electrolyte solution; or the adsorbent is added first to the solvent to separate the impurities, then separated before adding the conductive salt. The amount of adsorbent added is 0.2-3, especially 0.4-1.0 wt.%.Preferred Salt: The conductive salt is Li hexafluorophosphate, tetrafluoroborate, hexafluoroarsenate, methide, imide or triflate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Solvent: Suitable solvents for the electrolyte solution are organic carbonates, propionates, formates, acetates, halogenated carbonates and/or ethers; especially propylene, ethylene, butylene, di(m)ethyl, ethyl methyl and (m)ethyl propyl carbonate; (m)ethyl propionate, formate and acetate; chlorinated ethylene carbonate; fluorinated ethylene and propylene carbonate; and dimethoxyethane.    TECHNOLOGY FOCUS - POLYMERS - Preferred Carrier: Suitable carriers include polystyrene and other plastics. SPECIFIC COMPOUNDS - A specific examples of the carrier for the adsorbent is silicon dioxide. Specific examples of the conductive salt are Li hexafluorophosphate (LiPF6), tetrafluoroborate, hexafluoroarsenate, methide, imide and triflate. Specific examples of the solvent in the electrolyte are propylene, ethylene, butylene, di(m)ethyl, ethyl methyl and (m)ethyl propyl carbonate; (m)ethyl propionate, formate and acetate; chlorinated ethylene carbonate; fluorinated ethylene and propylene carbonate; and dimethoxyethane.    EXAMPLE - Lichroprep-NH2 (RTM; adsorbent with NH2 groups as base attached to SiO2 matrix by propylene groups) was dried in vacuo at 100 degrees C for 4 days. An electrolyte solution was prepared by mixing 440 g ethylene carbonate and 440 g dimethyl carbonate, cooling to 10 degrees C, adding 120 g LiPF6 and stirring. 1000 ml electrolyte were treated with 4 g adsorbent and stirrer briefly, then the adsorbent was filtered off immediately. The treated electrolyte contained less than 10 ppm each of HF and water.