Construction of ultrathin MnO₂ decorated graphene/carbon nanotube nanocomposites as efficient sulfur hosts for high-performance lithium-sulfur batteries.

ABSTRACT: Lithium-sulfur batteries are attracting significant attention due to their high theoretical specific capacity and low cost. However, their applications are hindered by the poor conductivity of sulfur and capacity fading caused by the shuttle effect. Here, ultrathin manganese dioxide decorated graphene/carbon nanotube nanocomposites are designed as sulfur hosts to suppress the shuttle effect and improve the adsorption efficiency of polysulfides. The graphene/carbon nanotube hybrids, with extraordinary conductivity and large surface area, function as excellent channels for electron transfer and lithium ion diffusion. The ultrathin manganese dioxide nanosheets enable efficient chemical interaction with polysulfides and promote the redox kinetics of polysulfides. As a result, an ultrathin mang

SUBMITTER: Wang N 

PROVIDER: S-EPMC9060960 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature