A polysulfide reduction accelerator – NiS2-modified sulfurized polyacrylonitrile as a high performance cathode material for lithium–sulfur batteries

Abstract

A NiS₂-modified sulfurized polyacrylonitrile composite is prepared by simply co-heating a mixture of sulfur, NiCO₃, and polyacrylonitrile. The NiS₂–SPAN cathode exhibits superior electrochemical performance, delivering a high reversible capacity of 1533 mA h g_sulfur⁻¹ (705 mA h g_composite⁻¹) at 0.2 A g⁻¹ after 100 cycles and good rate capability (1180 mA h g_sulfur⁻¹ at 2 A g⁻¹).