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A polyaniline (PANi)-coated sulfur cathode was prepared by in-situ polymerization to improve the performance of Li–S batteries and prevent polysulfide dissolution. Because PANi polymerization requires only the addition of sulfur powder, the polymerization method was simple. Battery performance testing was conducted using various sulfur ratios, with the best performance being exhibited by the 31wt% sulfur PANi composite (approximately 500mAhg−1S after 50 cycles from an initial capacity of 903mAhg−1S). Transmission electron microscopy images confirmed that sulfur was coated by an approximately 10-nm-thick layer of PANi. Cycle testing was conducted at a rate of 0.2C with an electrode loading of 2mgcm−2 of sulfur. Thus, a highly homogenous distribution of sulfur particles in PANi was achieved, resulting in sulfur-coated composite materials and allowing for the preparation of a conductive polymer by a relatively simple sulfur distribution method. © The Electrochemical Society of Japan, All rights reserved.

A Simple Preparation of Polyaniline-coated Sulfur Composites for use as Cathodes in Li&ndash;S Batteries

A Simple Preparation of Polyaniline-coated Sulfur Composites for use as Cathodes in Li–S Batteries