(US5019466-A)      Electrochemical cell comprises anode compartment contg. at coil operating temp. when cell is in charged state, molten alkali metal anode, cathode compartment contg. at operating temp. when cell is discharged, alkali metal Al halide molten salt electrolyte also molten at cell operating temp. having formula MAlHal4 : (where M is alkali metal of anode and Hal is halide).    Cathode compartment contains cathode comprising electronically conductive electrolyte-permeable matrix with Cu dispersed as active cathode substance, matrix being impregnated with electrolyte and separate to separate both anode and cathode compartments from each other. Separator comprises solid alkali metal conductor ions of anode or micromolecular sieve with such sorbed alkali metals.    Mfr. of electrochemical cell comprises: (i) loading housing cell comprising anode compartment electrolyte of formula MAlHal4, Cu active cathode substance and alkali metal halide MHal all into cathode compartment in order to make electrochemical cell precursor; and (ii) charging precursor at temp. at which molten salt electrolyte and alkali metal M are molten.    ADVANTAGE -   When cell is fully charged and all active cathode substance halogenated, ratio of alkali metal ions and Al ions is such that solubility of active cathode substance in molten electrolyte is at or near its min. @(12pp)@    (DE3942181-C2)      The method of making an electrochemical cell comprises loading into the cathode compartment of a cell housing comprising an anode compartment sepd. from a cathode compartment by a separator which is a solid conductor of ions of alkali metal M or is a micromolecular sieve which contains alkali metal M. An alkali metal aluminium halide molten salt electrolyte has the formula MAlHal4, where M is the alkali metal of the anode and Hal is a halide, and Cu as an active cathode substance to make an electrochemical cell precursor.    The precursor is charged at a temp. at which the molten salt electrolyte and alkali metal M are molten, to halogenate the Cu, with alkali metal being produced and passing through the separator into the anode compartment.    The proportions are selected so that when the cell is fully charged and all the available active cathode substance has been halogenated, the proportion of alkali metal ions and aluminium ions is such that the solubility of the active cathode substance in the molten electrolyte is at or near its minimum.