Glucose-Derived Micro-Mesoporous Carbon Spheres for High- Performance Lithium-Sulfur Batteries

作者：Xu, Cheng Y.; Du, R.^*; Yu, Chuan B.; Shi, Zhang Y.; Wang, Jiang L.; Li, Tian R.

来源：Energy and Fuels, 2022.

DOI：10.1021/acs.energyfuels.2c03421

• COATING LAYER
• GRAPHENE
• NITROGEN
• FRAMEWORK
• ELECTRODE
• CATHODE
• DESIGN

Glucose-derived micro-mesoporous carbon spheres (GMCS) are prepared using glucose as the carbon source and ZnCl2 as the chemical activator through hydrothermal, impregnation treatment and high-temperature calcination. The GMCS have a large specific surface area (SBET = 2128 m2 g-1) such that sulfur can effectively disperse on the surface and inside the micro- mesoporous structure of GMCS; such a micro-mesoporous structure can also inhibit the shuttle effect by adsorbing the polysulfides, thereby enhancing the electrochemical capabilities of lithium-sulfur batteries. As the cathode materials of lithium-sulfur batteries, the S@GMCS composites have good electrochemical performance. The initial discharge capacity of the S@GMCS composites is 1396 mA h g-1 at 0.1 C. When the batteries are cycled for 100 cycles, their discharge capacity remains 1014 mA h g-1, and the coulomb efficiency is close to 100%, which indicates excellent cyclic stability. This study demonstrated that the S@GMCS composites are lithium-sulfur batteries' ideal cathode materials, owing to their unique micro-mesoporous carbon sphere structure and remarkable electrochemical properties.

• 单位
  桂林理工大学