Sulfur impregnation in polypyrrole-modified MnO2 nanotubes: efficient polysulfide adsorption for improved lithium–sulfur battery performance

PPy-coated MnO₂ nanotubes were fabricated as a highly efficient sulfur host. Hollow interior of the MnO₂ nanotubes and the polypyrrole outer layer can effectively improve the specific capacity and maintain an extremely stable cycling performance.