NOVELTY - A shaped article is formed by combining a fluorinated ionomer with a polar aprotic liquid, mixing the ingredients to form a plastically formable composition and forming the composition into a shaped article.    USE - In electrochemical applications such as batteries, fuel cells, electrolysis cell, ion-exchange membranes, sensors, electrochemical capacitors, electrochromic windows and modified electrodes especially in lithium batteries. The composition can be molded into films or sheets. The films or sheets may be further formed into shaped articles.    ADVANTAGE - The composition is a single ion conductor not susceptible to performance degrading, charged polarization, exhibits high stability and can be combined with aprotic polar solvents to form highly conductive compositions. The continuous melt processability provides a significant reduction in the manufacturing cost.    DETAILED DESCRIPTION - A shaped article is formed by combining in a vessel a polymer comprising vinylidene fluoride and perfluoroalkenyl monomer unit (2-50 mol%) having a pendant group of formula (I) with a polar aprotic liquid. The ingredients are mixed to form a plastically formable composition. The composition is formed into a shaped article by applying heat and/or pressure.    R,R' = F, Cl or 1-10C perfluoroalkyl optionally substituted by an ether oxygen;    a = 0-2;    b = 0-6;    M+ = H+ or monovalent metal cation;    X = O, C or N;    d is 0 when X is O, otherwise d is 1.    c is 1 when X is C and c is 0 when X is N.    When c is 1, Y and Z are CN, SO2Rf, SO2R3, P(O)(OR3)2, CO2R3, P(O)R32, C(O)Rf, C(O)R3 or cycloalkenyl, where    Rf = 1-10C perfluoroalkyl optionally substituted by oxygen;    R3 = 1-6C alkyl optionally substituted by oxygen or aryl    When c is 0, Y = SO2R'f, where    R'f = radical of formula (II);    R''f = -CnF2n-;    n = 1-10;    m = 0 or 1;    R'''f = -CnF2n+1, optionally substituted by an ether oxygen.    An INDEPENDENT CLAIM is also included for forming an electrochemical cell. The process comprises layering the shaped article with a positive electrode, a separator, a negative electrode or a current collector. The layer articles are consolidated to form the electrochemical cell.