Phosphorus-Modified Fe4N@N, P Co-doped Graphene as Efficient Sulfur Host for High-Performance Lithium-Sulfur Batteries

摘要: Lithium–sulfur batteries have attracted increasing attention in the field of energy storage due to their advantages high specific and density. However, there are still many difficulties practical application lithium–sulfur batteries, such as large volume expansion sulfur shuttle effect polysulfides, which led rapid capacity attenuation poor cycling performance. To address these problems, herein, nanosized phosphorus-modified Fe4N supported by nitrogen, phosphorus co-doped graphene nanosheets (P-Fe4N@NPG) has been synthesized a simple solvothermal method combined with subsequent nitriding phosphating calcination, then used host for batteries. Benefiting from electrical conductivity, multiple composition unique structure, obtained P-Fe4N@NPG/S cathode exhibits excellent electrochemical performances: presents initial 1386.1 mA h g−1 at 0.1C, distinct performance (417.4 1C after 1000 cycles) rate loading 73 wt%. Even if increases 3.52 5.65 mg cm−2, displays an outstanding areal 6.03 respectively. These results indicate that our design P-Fe4N@NPG is great development hosts