Doped Carbon-Based Materials as Li–S Battery Separator

The shuttle problem of polysulfides has always been a major challenge for lithium–sulfur batteries. Carbon-based materials are favored in diaphragm modification because of their excellent physical and chemical stability, high electrical conductivity and controllable shape. However, due to the weak contact between non-polar carbon matrix and polar lithium polysulfide, carbon-based materials doped with N, O, P, S and other heteroatoms were studied. With the gradual deepening of the research of lithium–sulfur battery, the design of multi-functional separator combined with the synergistic effect of a variety of technologies and functions can restrain the shuttle effect of lithium–sulfur battery and improve the performance of lithium–sulfur battery. In addition to these strategies, this chapter will also summarize and review the development of heteroatom doping and multifunctional separators in reducing polysulfide ion shuttling and lithium anode failure (pulverization or dendritic) to improve the overall performance of the battery.