A carbon-sulfur hybrid with pomegranate-like structure for lithium-sulfur batteries

ÂKGaA, Weinheim. A carbon-sulfur hybrid with pomegranate-like core-shell structure, which demonstrates a high rate performance and relatively high cyclic stability, is obtained through carbonization of a carbon precursor in the presence of a sulfur precursor (FeS2) and a following oxidation of FeS2to sulfur by HNO3. Such a structure effectively protects the sulfur and leaves enough buffer space after Fe3+removal and, at the same time, has an interconnected conductive network. The capacity of the obtained hybrid is 450 mA h g-1under the current density of 5 C. This work provides a simple strategy to design and prepare various high-performance carbon-sulfur hybrids for lithium-sulfur batteries. Pomegranate recipe: A carbon-sulfur hybrid with pomegranate-like core-shell structure was obtained through carbonization of a carbon precursor in the presence of a sulfur precursor (FeS2), followed by oxidation of FeS2to sulfur by HNO3. The hybrid displays a high rate performance and relatively high cyclic stability.