Introduction
The lithium/sulfur cell was an extremely attractive redox couple because of high theoretical specific energy of 2600Wh/kg(1672mAh/g-sulfur), assuming complete reaction to the Li2S. The successful development of a lithium sulfur battery requires extensive research on the electrochemical behaviors under various operation conditions.[1,2,3,4,5] Cheon et al. reported that the capacity of Li/S cell decreased with the increasing of current density and thick Li2S layer formed at the surface of the cathode causes the diminution of the second discharge region at high discharge rate by using the scanning electronmicroscope (SEM).[6] In this paper, the performance changes of the lithium/sulfur (Li/S) battery with discharge rate are reported. The change of sulfur electrode was tested by scanning electron microscopy (SEM), X-ray diffractometer (XRD), differential scanning calorimeter (DSC) et al. Based on the above analysis results, we tried to find factors that affects the rate capability of the Li/S batteries.
