Facile Synthesis of a 'Two-in-One' Sulfur Host Featuring Metallic-Cobalt-Embedded N-Doped Carbon Nanotubes for Efficient Lithium-Sulfur Batteries
| Autor: | A-Hu Shao, Dong-Gen Xiong, Zhenyu Yang, Jianxin Cai, Ze Zhang, Ji Yu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Heteroatom Electrochemical kinetics Nanoparticle chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Sulfur 0104 chemical sciences law.invention chemistry Chemical engineering law General Materials Science 0210 nano-technology Cobalt Sulfur utilization |
| Zdroj: | ACS applied materialsinterfaces. 12(5) |
| ISSN: | 1944-8252 |
| Popis: | The exploration of efficient host materials of sulfur is significant for the practical lithium-sulfur (Li-S) batteries, and the hosts are expected to be highly conductive for high sulfur utilization and exhibit strong interaction toward polysulfides to suppress the shuttle effect for long-lasting cycle stability. Herein, we propose a simple synthesis of metallic cobalt-embedded N-doping carbon nanotubes (Co@NCNT) as a "two-in-one" host of sulfur for efficient Li-S batteries. In the binary host, the N-doped CNTs, cooperating with metallic Co nanoparticles, can serve as 3D conductive networks for fast electron transportation, while the synergetic effect of metallic Co and doping N heteroatoms helps to chemically confine polysulfides, acting as active sites to accelerate electrochemical kinetics. With these advantages, the S/Co@NCNT composite delivers an excellent cycling stability with a capacity decay of 0.08% per cycle averaged within 500 cycles at a current density of 1 A g-1 and a high rate performance of 530 mA h g-1 at 5 A g-1. Further, the superior electrochemical performance of the S/Co@NCNT electrode can be maintained under a high sulfur loading up to 4 mg cm-2. Our work demonstrates a feasible strategy to design promising host materials simultaneously featuring high conductivity and strong confinement toward polysulfides for high-performance Li-S batteries. |
| Databáze: | OpenAIRE |
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