The invention provides a lithium-sulfur electric current producing cell comprising an anode; electrolyte; and cathode, where the cathode comprises a polymer-sulfur composite comprising: 5 to 80 wt% sulfur; 0 to 90 wt% conductive polymer; 0 to 50 wt% of one or more conductive agents, other than the conductive polymer; and 0.5 to 20 wt% a first dopant comprising a negatively charged organic polymer; wherein the conductive polymer is doped with the first dopant.