Fe2O3 nano particles embedded Fe2O3/BP2000 composite for Li-S battery

Shuttle effect of lithium polysulfides in lithium sulfur batteries greatly influenced their commercialization. Therefore, it is urgent to develop a cheep and effective way to alleviate the shuttle effect. Fe is an active transition element which has good catalytic ability, in this work, a simple wet impregnation method was used to make Fe ions infiltrate into the pores of BP2000 (a kind of commercial conductive carbon), then it was calcined in N₂ atmosphere to get a Fe₂O₃/BP2000 composite and used as a separator modification layer. The Fe₂O₃ nano particles were decorated in the pores of BP2000 which greatly enhanced the absorption ability on lithium polysulfides, additionally it also showed excellent catalytic effect on lithium polysulfides, thus the Fe₂O₃/BP2000 layer can be served as a secondary collector to re-engage the polysulfides in the cathode reaction. In this way, the lithium sulfur batteries equipped with the Fe₂O₃/BP2000 modified separator showed impressive electrochemical performances.