Lithium-sulfur batteries have attracted wide research interest due to their high specific capacity(1675 mA h g^(-1))and high specific energy(2500 W h kg^(-1)).Herein,the two-dimensional nitrogen/sulfur synchronous-dop...Lithium-sulfur batteries have attracted wide research interest due to their high specific capacity(1675 mA h g^(-1))and high specific energy(2500 W h kg^(-1)).Herein,the two-dimensional nitrogen/sulfur synchronous-doped few-layer graphene(N,S-FLG)was prepared by a simple calcination route at 900℃under an argon atmosphere with g-C_(3)N_(4)as a structural template.The calcination temperature favorably adjusted the doping levels and surface texture of the as-obtained samples.Relying on the synergistic interaction of the structural traits,as the reservoir of sulfur,NS-FLG-900(calcination temperature 900℃)can maintain a reversible capacity of 602 mA h g^(-1)after 300 cycles at a current density of 0.8 A g^(-1)and 506.4 mA h g^(-1)after 500 cycles at a current density of 1.6 A g^(-1).The outstanding performance is obtained due to the synergistic effect of the introduction of N and S into the carbon lattice,the high pore volume(1.31 cm^(3)g^(-1))and large specific surface area(460.9 m^(2)g^(-1)).展开更多
基金financial supports provided by the National Natural Science Fund of China(No.21601108)Young Scholars Program of Shandong University(2017WLJH15)+1 种基金the Fundamental Research Funds of Shandong University(No.2016JC033,2016GN010)the Taishan Scholar Project of Shandong Province(No.ts201511004).
文摘Lithium-sulfur batteries have attracted wide research interest due to their high specific capacity(1675 mA h g^(-1))and high specific energy(2500 W h kg^(-1)).Herein,the two-dimensional nitrogen/sulfur synchronous-doped few-layer graphene(N,S-FLG)was prepared by a simple calcination route at 900℃under an argon atmosphere with g-C_(3)N_(4)as a structural template.The calcination temperature favorably adjusted the doping levels and surface texture of the as-obtained samples.Relying on the synergistic interaction of the structural traits,as the reservoir of sulfur,NS-FLG-900(calcination temperature 900℃)can maintain a reversible capacity of 602 mA h g^(-1)after 300 cycles at a current density of 0.8 A g^(-1)and 506.4 mA h g^(-1)after 500 cycles at a current density of 1.6 A g^(-1).The outstanding performance is obtained due to the synergistic effect of the introduction of N and S into the carbon lattice,the high pore volume(1.31 cm^(3)g^(-1))and large specific surface area(460.9 m^(2)g^(-1)).
