Abstract: The cathode material of lithium/sulfur rechargeable batteries,sulfur,exhibits poor conductivity,and its dischange product is partially soluble,leading to capacity decay during cycling.To mitigate these problems,we proposed to design the cathode material with a conducting skeleton and energy-storing side chains,and prepared a novel material carbyne polysulfide.The products obtained by co-heating carbon containing carbyne moieties and element sulfur were characterized by elemental analysis,¹³C NMR,Raman,and DSC/TG,and the product obtained at 300℃ was proved to have a sp² hybride carbon skeleton with polysulfide attached on it,which resembles the theoretical structure of carbyne polysulfide.This material exhibits a high capacity of 773 mA·h/g at 400 mA/g and a stable reversible capacity of 350 mA·h/g after 50 cycles.The good performance of this cathode material under swift discharge condition and its good cycling properties indicate the success of our new design principle.