A novel suspension polymerization process to prepare sulfur composite cathode materials for lithium/sulfur batteries

The sulfur-containing PAN composite cathode materials for lithium/sulfur batteries were prepared by suspension polymerization method and electrochemical properties of lithium/sulfur cells were investigated. The sulfur composite cathode was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The structure analysis showed that the sulfur composite is constituted by homogenous flake-like crystallites with the size about 100 nm. The sulfur composite cathode showed a not very high initial capacity of 546.6 mAh•g⁻¹, but the cycle performance was excellent and had a slowly capacity fade after the second cycle, and remained at a reversible capacity of 400mAh•g⁻¹ after 30 cycles.