A porous 3D-RGO@MWCNT hybrid material as Li-S battery cathode

• Published in: Beilstein journal of nanotechnology Vol. 10; no. 1; pp. 514 - 521
• Main Authors: Zhang, Yongguang, Ren, Jun, Zhao, Yan, Tan, Taizhe, Yin, Fuxing, Wang, Yichao
• Format: Journal Article
• Language: English
• Published: Germany Beilstein-Institut zur Föerderung der Chemischen Wissenschaften 21.02.2019; Beilstein-Institut
• Subjects: Batteries; Carbon; carbon nanotubes; Cathodes; Composite materials; energy storage and conversion; Full Research Paper; Graphene; Li–S batteries; Metal oxides; Multi wall carbon nanotubes; nanocomposites; Nanoscience; Nanotechnology; Physical restraints; Porous materials; Porous media; Scanning electron microscopy; Spectrum analysis; Sulfur; Thermogravimetric analysis; Three dimensional composites; China; Li–S batteries; carbon nanotubes; energy storage and conversion; nanocomposites
• ISSN: 2190-4286; 2190-4286
• DOI: 10.3762/bjnano.10.52

In this work, a unique three-dimensional (3D) structured carbon-based composite was synthesized. In the composite, multiwalled carbon nanotubes (MWCNT) form a lattice matrix in which porous spherical reduced graphene oxide (RGO) completes the 3D structure. When used in Li-S batteries, the 3D porous lattice matrix not only accommodates a high content of sulfur, but also induces a confinement effect towards polysulfide, and thereby reduces the "shuttle effect". The as-prepared S-3D-RGO@MWCNT composite delivers an initial specific capacity of 1102 mAh·g . After 200 charging/discharge cycles, a capacity of 805 mAh·g and a coulombic efficiency of 98% were maintained, implying the shuttle effect was greatly suppressed by the composite matrix. In addition, the S-3D-RGO@MWCNT composite also exhibits an excellent rate capability.