Bifunctional interlayer for capturing polysulfide in Li-S battery

摘要

Bifunctional interlayer prepared by the polypyrrole-coated vapor-grown carbon fiber was proposed for efficiently capturing polysulfide in Li-S battery (VGPY). The as-prepared bifunctional VGPY interlayer not only can physically adsorb the polysulfide but also can reduce the polarization of the sulfur cathode. The Li-S battery used bifunctional VGPY interlayer shows the first discharge capacity of 1204.51mAhg(-1) at 0.1C, which is 426.56mAhg(-1) high than that without the interlayer, and the Li-S batteries capacity maintained at 1262.56mAhg(-1) at the current density of 0.1C and 853.71mAhg(-1) at 0.5C, respectively, after 300cycles, demonstrating excellent cycle stability.