Jump to main content
Jump to site search

Issue 10, 2010
Previous Article Next Article

Enhancement of long stability of sulfur cathode by encapsulating sulfur into micropores of carbon spheres

Author affiliations

Abstract

To enhance the long stability of sulfur cathode for a high energy lithiumsulfur battery system, a sulfurcarbon sphere composite was prepared by encapsulating sulfur into micropores of carbon spheres by thermal treatment of a mixture of sublimed sulfur and carbon spheres. The elemental sulfur exists as a highly dispersed state inside the micropores of carbon spheres with a large surface area and a narrow pore distribution, based on the analyses of the X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), thermogravimetry (TG) and local element line-scanning. It is demonstrated from galvanostatic discharge–charge process, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) that the sulfurcarbon sphere composite has a large reversible capacity and an excellent high rate discharge capability as cathode materials. In particular, the sulfurcarbon sphere composite with 42 wt% sulfur presents a long electrochemical stability up to 500 cycles, based on the constrained electrochemical reaction inside the narrow micropores of carbon spheres due to strong adsorption. Therefore, the electrochemical reaction constrained inside the micropores proposed here would be the dominant factor for the enhanced long stability of the sulfur cathode. The knowledge acquired in this study is important not only for the design of efficient new electrode materials, but also for understanding the effect of the micropores on the electrochemical cycle stability.

Graphical abstract: Enhancement of long stability of sulfur cathode by encapsulating sulfur into micropores of carbon spheres

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Feb 2010, accepted on 15 Jun 2010 and first published on 16 Aug 2010


Article type: Paper
DOI: 10.1039/C002639E
Energy Environ. Sci., 2010,3, 1531-1537

  •   Request permissions

    Enhancement of long stability of sulfur cathode by encapsulating sulfur into micropores of carbon spheres

    B. Zhang, X. Qin, G. R. Li and X. P. Gao, Energy Environ. Sci., 2010, 3, 1531
    DOI: 10.1039/C002639E

Search articles by author

Spotlight

Advertisements