Mesoporous Carbon-Carbon Nanotube-Sulfur Composite Microspheres for High-Areal-Capacity Lithium-Sulfur Battery Cathodes

摘要

Lithium-sulfur (Li-S) batteries offer theoretical energy density much higher than that of lithium-ion batteries, but their development faces significant challenges. Mesoporous carbon—sulfur composite microspheres are successfully synthesized by combining emulsion polymerization and the evaporation-induced self-assembly (EISA) process. Such materials not only exhibit high sulfur-specific capacity and excellent retention as Li—S cathodes but also afford much improved tap density, sulfur content, and areal capacity necessary for practical development of high-energy-density Li—S batteries. In addition, when incorporated with carbon nanotubes (CNTs) to form mesoporous carbon—CNT—sulfur composite microspheres, the material demonstrated superb battery performance even at a high current density of 2.8 mA/cm~2, with a reversible capacity over 700 mAh/g after 200 cycles.