A simple preparation of polyaniline-coated sulfur composites for use as cathodes in li-s batteries

A polyaniline (PANi)-coated sulfur cathode was prepared by in-situ polymerization to improve the performanc of Li-S batteries and prevent polysulfide dissolution. Because PANi polymerization requires only the addition o sulfur powder, the polymerization method was simple. Battery performance testing was conducted using variou sulfur ratios, with the best performance being exhibited by the 31wt% sulfur PANi composite (approximatel 500mAhg?1S after 50 cycles from an initial capacity of 903mAhg?1 S). Transmission electron microscopy image confirmed that sulfur was coated by an approximately 10-nm-Thick layer of PANi. Cycle testing was conducted at rate of 0.2C with an electrode loading of 2mg cm?2 of sulfur. Thus, a highly homogenous distribution of sulfu particles in PANi was achieved, resulting in sulfur-coated composite materials and allowing for the preparation of conductive polymer by a relatively simple sulfur distribution method.