An energy storage system includes, in an exemplary embodiment, a first current collector having a first surface and a second surface, a first electrode including a plurality of carbon nanotubes on the second surface of the first current collector. The plurality of carbon nanotubes include a polydisulfide applied onto a surface of the plurality of nanotubes. The energy storage system also includes an ionically conductive separator having a first surface and a second surface, with first surface of the ionically conductive separator positioned on the first electrode, a second current collector having a first surface and a second surface, and a second electrode including a plurality of carbon nanotubes positioned between the first surface of the second current collector and the second surface of the ionically conductive separator.