Confined Sulfur in 3 D MXene/Reduced Graphene Oxide Hybrid Nanosheets for Lithium–Sulfur Battery

5 years ago

Confined Sulfur in 3 D MXene/Reduced Graphene Oxide Hybrid Nanosheets for Lithium–Sulfur Battery

Dawei Su, Wenjian Wu, Guoxiu Wang, Jianjun Song, Jing Xu, Xiuqiang Xie, Xin Guo, Weizhai Bao

Three-dimensional metal carbide MXene/reduced graphene oxide hybrid nanosheets are prepared and applied as a cathode host material for lithium–sulfur batteries. The composite cathodes are obtained through a facile and effective two-step liquid-phase impregnation method. Owing to the unique 3 D layer structure and functional 2 D surfaces of MXene and reduced graphene oxide nanosheets for effective trapping of sulfur and lithium polysulfides, the MXene/reduced graphene oxide/sulfur composite cathodes deliver a high initial capacity of 1144.2 mAh g−1 at 0.5 C and a high level of capacity retention of 878.4 mAh g−1 after 300 cycles. It is demonstrated that hybrid metal carbide MXene/reduced graphene oxide nanosheets could be a promising cathode host material for lithium–sulfur batteries. Composite cathodes: Metal carbide MXene/reduced graphene oxide hybrid nanosheets are applied as cathode host materials for lithium–sulfur batteries. With their unique 3 D layer structure and functional 2 D surfaces for the effective trapping of sulfur and lithium polysulfides, the composite cathodes deliver a high initial capacity (1144.2 mAh g−1 at 0.5 C) and excellent capacity retention (878.4 mAh g−1 after 300 cycles), so are promising candidates for application in lithium–sulfur batteries (see figure).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201702387