EFFECT OF ADDITION OF GRAPHITE AND LITHIUM AND POTASSIUM HALIDES ON THE POTENTIAL OF A SULFUR ELECTRODE

The effect of addition of graphite powder or a mixture of alkali metal halides on the potential of a sulfur electrode containing lithium was experimentally investigated at 693 K. The electrode was separated fro m the molten electrolyte by a solid glassy electrolyte membrane with l ithium ion conductivity. The potential of the sulfur electrode was mea sured relative to the lithium reference electrode. Incorporation of 6. 2 to 23.4 wt. % graphite in the lithium - sulfur electrode did not aff ect its potential, which remained equal to 2.194+/-0.001 V. When LiCl- KCl or LiF-LiCl-LiI eutectic salt mixtures were added to the electrode , the electrode potential increased slightly, indicating a phase inter action.