well as an oxygen and water free environment the completed cell was repeatedly discharged and charged several times at 400 microamperes a cathode was constructed by coating carbonized mos 2 onto an aluminum foil strip measuring 2 5 cm u00d7 10 cm u00d7 20 microns as follows a the aluminum substrate was baked at 590 u00b0 c in a purified nitrogen atmosphere for about 20 minutes b after the foil cooled a suspension of 10 by weight mos 2 in heavy lubricating oil was applied to the foil as a film the average mos 2 particle diameter was 0 25 microns the foil substrate with applied film was placed on a quartz slab measuring 15 cm u00d7 4 cm u00d7 0 5 cm c the foil substrate with applied film and slab were placed in a quartz tube having a 2 inch diameter nitrogen was caused to flow through the tube at 400 cc min oxygen was caused to flow through the tube at 0 2 cc min d when the gas flow through the tube had stabilized the tube was inserted in a furnace which had been preheated to 590 u00b0 c e the oxygen flow was turned off about 5 minutes after the tube had been placed in the furnace the nitrogen flow was held constant at 400 cc min f the tube was removed from the furnace about 15 minutes after it was first placed in the furnace g the tube was allowed to cool to room temperature after which time the nitrogen flow was turned off and the completed cathode removed from the tube the coat thickness of the cathode was measured to be 0 5 mg cm 2 a 7 cm 2 piece of coated substrate was used.