Graphene-wrapped sulfur nanospheres with ultra-high sulfur loading for high energy density lithium-sulfur batteries

- A graphene-wrapped sulfur nanospheres composite with 91 wt% S is prepared.
- It shows highly improved electrochemical performance as cathode for Li-S cell.
- The PVP coating and conductive graphene minimize polysulfides dissolution.
- The flexible coatings with void space accommodate the volume expansion of sulfur.