Abstract:
Herein, we demonstrate the fabrication of a three-dimensional (3D) polypyrrole-coatedporous graphene (PPy/PG) composite through in-situ polymerization of pyrrole monomer on PG
surface. The PPy/PG displays a 3D hierarchical porous structure and the resulting PPy/PG hybrid
serves as a conductive trap to lithium polysulfides enhancing the electrochemical performances.
Owing to the superior conductivity and peculiar structure, a high initial discharge capacity of
1020 mAh g−1 and the reversible capacity of 802 mAh g−1 over 200 cycles are obtained for the
S/PPy/PG cathode at 0.1 C, remaining the remarkable cyclic stability. In addition, the S/PPy/PG
cathodes demonstrate an excellent rate performance exhibiting 477 mAh g−1 at 2 C.