(GB2148586-B)      A method of making a unitary electrolyte/composite cathode film component for use in a solid state electrochemical cell comprising an anode having lithium as its active material, a polymeric electrolyte, and a composite cathode in the form of a composite of a cathode material in combination with a polymeric material, which method comprises the steps of: (i) preparing a solution of one of the electrolyte or the composite cathode material in a solvent at an elevated temperature, the polymer and the solvent having the properties that the polymer is readily soluble therein at the elevated temperature and sparingly soluble therein at a lower temperature, and that immediate precipitation of the polymer does not occur on cooling the solution from the elevated temperature to the lower temperature; (ii) cooling the solution to the lower temperature and solution casting onto a film of the other of the electrolyte or the composite cathode material followed by evaporation of the solvent to form a film of said one of the electrolyte or the composite cathode material.h    (US4631810-A)      Solid state electrochemical cell comprising an anode having Li as active material, a polymeric electrolyte and a composite cathode in the form of an insertion electrode material or similar active material in combination with a polymeric material is produced as follows.    A soln. of the polymeric electrolyte or the composite cathode material in solvent at elevated temp. is prepd. The polymer of the electrolyte and cathode is readily soluble in the solvent at the elevated temp. and sparingly soluble at lower temp. Immediate pptn. of the polymer does not occur when the polymer soln. is cooled from the elevated temp. to the lower temp.    The polymer soln. is cooled to the lower temp. then soln. cast onto a film of the other of the polymeric electrolyte or the composite cathode as substrate. Solvent is evapd. to produce a film and a unitary electrolyte/cathode film component is obtd. This is assembled with an anode to form the cell.    ADVANTAGE -   Dissolution of the substrate film in the soln. casting step is avoided. (4pp)