Sulfur–nitrogen doped multi walled carbon nanotubes composite as a cathode material for lithium sulfur batteries

The performance of lithium sulfur (Li/S) battery was greatly improved by the employment of nitrogen doped carbon nanotubes (N-CNTs) based cathode. By manipulating its structure thereby creating more defects, N-CNTs presents better dispersion of sulfur particles on N-CNTs and higher electrical conductivity compared with their non-doped counterpart, which explain the reason why N-CNTs/S composite shows improved performance. The specific discharge capacity was maintained at 625 mAh g−1 and 513 mAh g−1 after 100 cycles at 0.2 C and 0.5 C, respectively, which was about 2 times as that of CNTs. This method is proved to be a promising way to develop cathode materials for lithium sulfur batteries.