polymer now has all the characteristics of a thermodynamic behaviour without any apparent kinetic limitation the following examples 1 to 7 illustrate variant embodiments of the electrochemical generator disclosed hereinbefore in all the examples the same generator structure is used as that shown in fig1 with stainless steel current collectors 3 and 13 a semipermeable membrane 7 made of nafion u00ae a separating material 9 of mineral fibres and an electrolyte formed by a solution of lithium perchlorate in propylene carbonate in a 2 mole 1 concentration of lithium perchlorate in this example the positive active material 5 is formed by a film of polypyrrole is formed by a film of polypyrrole 10 u03bcm in thickness which was produced by electrolytic polymerization in the conditions set forth hereinbefore the negative active material 11 is formed by a 5 u03bcm layer of polypyrrole deposited on the stainless steel support 13 and coated with a second deposit of lithium obtained by electrolysis of lithium perchlorate in propylene carbonate in the compartment 15 of the positive electrode 10 2 mole 1 of ferrocene is added and 2 u00d7 10 2 mole 1 of benzophenone is added in the compartment 17 of the negative electrode this generator has an electromotive force of 3 4 volts with a current density of about 1 2 ma cm 2 in this example the positive active material 5 is formed.