Nitrogen-doped porous carbon was prepared from peony shell for the cathode material of lithium-sulfur battery

摘要

A kind of nitrogen-oxygen dual-doped porous carbon (NOPC) was successfully prepared from biomass waste peony shell by a simple carbonization and activation. Three kinds of N and O dual-doped materials were prepared by the ratio of different carbon materials to urea, among which the NOPC-2 has ultra-high specific surface area (3177 m(2) g(-1)), high pore volume (1.994 cm(3) g(-1)), high mesoporous ratio(31%) and appropriate N,O co-doping. Then, the NOPC-2/S was prepared by co-thermal melting of NOPC-2 with sulfur, and the NOPC-2/S cathode showed excellent electrochemical properties in lithium sulfur battery. The capacity of NOPC-2/S with sulfur content of 70.1% was 618mAhg(-1) after 200 cycles at 0.2 degrees C and remained a reversible capacity of 449.3mAhg(-1), even after 400 cycles at 1C with only 0.085% capacity fade per cycle. Its excellent electrochemical performance is mainly attributed to its high mesoporous ratio and N,O co-doping. (C) 2020 Elsevier B.V. All rights reserved.