ИСТИНА

The search for new functional materials for chemical power sources is an urgent task of electrochemical energy. In the present work, we have synthesized composites based on phosphorus sulfide and carbon (PxSy@C). Synthesis of PxSy@C was carried out in an atmosphere of argon at a temperature of 470 ° C for 2 hours. The stoichiometric mixtures of red phosphorus and sulfur were used as starting reagents. Two types of carbon black with diffefent speсific surface area: Ketjen Black-300 (KB-300) and Ketjen Black-600 (KB-600) were used as a carbon substrate. For physico-chemical and electrochemical characterization of the synthesized samples scanning electron spectroscopy, Raman spectroscopy, electron dispersion analysis, cyclic chronopotentiometry were used. As a result, the synthesized composites were found to have the composition P4S3@C, and the morphology of the synthesized samples is determined by the morphology of the carbon substrate. Electrochemical tests showed that lithium and sodium are capable of being reversibly incorporated into the synthesized composites. The reversible capacity for lithium insertion at a current density of 250 mA/g was about 550 and 660 mAh/g for P4S3@KB-600 and P4S3@KB-300, respectively. Reversible capacity when introducing sodium in P4S3@C was much lower and for both composites did not exceed 300 mAh/g. Acknowledgments This work was supported by the Russian Foundation for Basic Research, project nos. 19-03-00236.