concentration of lithium polysulphide in electrolyte were calculated based on the analysis results a porous electrode made up of 50 electroconductive carbon black ketjenblack ec 600jd available from akzo nobel polymer chemicals bv netherlands and 50 polyethylene oxide peo 4 000 000 molecular weight available from sigma aldrich uk as a binder was prepared according to the following procedure a mixture of dry components was milled in a high speed grinder microtron mb550 for 15 to 20 minutes acetonitryl was then added to the mixture as a solvent for the binder the resulting suspension was then mixed for 15 to 20 hours in a dlh laboratory stirrer the solids content of the suspension was 5 the suspension thus produced was deposited by an automatic film applicator elcometer sprl to one side of an 18 u03bcm thick aluminum foil with an electroconductive carbon coating product no 60303 available from rexam graphics south hadley mass as a current collector the carbon coating was dried in ambient conditions for 20 hours after drying the electrode was pressed at a pressure of 1000 kg cm 2 the resulting dry cathode layer had a thickness of 8 u03bcm after pressing and contained 0 47 mg cm 2 of carbon peo mixture the volume density of the carbon layer was 590 mg cm 3 and the porosity was 72 a suspension comprising a mixture of lithium sulphide with sulphur in an electrolyte was produced lithium sulphide 98 sigma aldrich uk and sublimated sulphur 99 5 fisher scientific uk were ground at.