TECHNOLOGY FOCUS - POLYMERS - Preferred Polymer: R groups comprise methoxyethoxyethoxy groups. Hydrophobic groups comprise F-containing moieties, especially OCH2CF3, OCH2CH2CF3, OCH2(CF2)vCF3 (v = 1-1,000), OCH2(CF2)pCF2H (p = 0-1,000), n-propyl, I-propyl, n-butyl, I-butyl, OCH2Si(CH3)2 or (OSi(CH3)2)pOSi(CH3)3).Preferred Gel System: System comprises:(a) a co-substituted linear phosphazene component;(b) a small organic molecule additive to impart ionic conductance and to plasticize the polymer; and(c) a metal salt component to impart ionic conductance.Gel electrolyte system has a conductance at room temperature of at least 10-4 S/cm.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Additives: Organic additive comprises alkylene carbonate, lactone, n-methyl pyrrolidone, tetramethylene sulfone, dioxolane, glyme, short chain ethylene oxide, short chain ethylene glycol, cyclic phosphazene trimer or tetramer, alkylphosphate, alkyl phosphite, alkylphosphine, dibutyl phthalate, dimethylacetamide, dimethylformamide, hexamethyl phosphoramide, substituted pyridine, crown ether, cryptand, podand and/or dioctyl sebacate. Metal salt component is a salt of Li, Mg, Na, K, Rb, Cs, Be, Ca, Mg, Ba, Cu or Zn, especially Li trifluoromethanesulfonate, Li perchlorate, Li (bis trifluoromethylsulfonyl)imide, Ba trifluoromethanesulfonate, copper perchlorate etc. EXAMPLE - 2-(2'-Methoxyethoxy)ethanol (1.24 g) was added to sodium hydride (0.42 g) in dry THF (125 mL) and the mixture was stirred overnight at room temperature to form the corresponding sodium salt. 2,2,2-Trifluoroethanol (4.40 g) was added to NaH (1.76 g) in dry THF (125 mL) and the mixture stirred overnight at room temperature to form the corresponding sodium salt. Polydichlorophosphazene (3.0 g) was dissolved in THF (500 mL) and the solution stirred overnight. The solution of the Na salt of 2-(2'-methoxyethoxy)ethanol was added dropwise. The resulting solution was stirred at 50degreesC overnight. The partially substituted polymer solution was allowed to cool to room temperature and the Na salt of 2,2,2-trifluoroethanol was added dropwise to the polymer solution at room temperature. The resulting solution was stirred at 50 degreesC overnight. The polymer reaction mixture was concentrated by rotary evaporation and precipitated twice into water and twice into hexanes. The final polymer (N P(OCH2CH2OCH2CH2OCH3)0.41(OCH2CF3)1.59)n was isolated as a white rubbery solid.