was repeated except that 5 0 g of 3 3 39 dimethyl 2 2 39 bithiophene was used instead of pyrrole to obtain a porous film having one blackish blue surface the electric conductivity in the horizontal direction of the obtained film was 4 6 u00d7 10 4 scm 1 while that in the vertical direction was 10 10 scm 1 or lower description will now be given for examples of secondary batteries using any of the foregoing electrically conductive materials as an electrode thereof a porous polyethylene film having a pore size of 0 1 to 10 u03bcm a thickness of 20 u03bcm a length of 10 cm and a width of 20 cm was immersed in a saturated solution of fecl 3 6h 2 o in methanol at room temperature for 30 min dried in air and rid of droplets of the solution of fecl 3 6h 2 o methanol partially remaining on the surface of the film by making them absorbed with a filter paper thus the fecl 3 component was uniformly retained on the porous film in the pores of the film subsequently 4 ml of pyrrole was placed in the bottom of a glass container length 10 cm width 25 cm height 15 cm and the porous film treated as described above was suspended from the upper portion of the glass container followed by tightly covering the upper portion of the container with a glass plate whereby the film was contacted with.