Format

Send to

Choose Destination
Chemistry. 2015 Jan 12;21(3):1343-9. doi: 10.1002/chem.201404686. Epub 2014 Nov 20.

Sulfur encapsulated in a TiO2-anchored hollow carbon nanofiber hybrid nanostructure for lithium-sulfur batteries.

Author information

1
School of Metallurgy and Environment, Central South University, Changsha 410083 (P.R. China), Fax: (+86) 731-88830649. zza75@163.com.

Abstract

A hollow carbon nanofiber hybrid nanostructure anchored with titanium dioxide (HCNF@TiO2) was prepared as a matrix for effective trapping of sulfur and polysulfides as a cathode material for Li-S batteries. The synthesized composites were characterized and examined by X-ray diffraction, nitrogen adsorption-desorption measurements, field-emission scanning electron microscopy, scanning transmission electron microscopy, and electrochemical methods such as galvanostatic charge/discharge, rate performance, and electrochemical impedance spectroscopy tests. The obtained HCNF@TiO2-S composite showed a clear core-shell structure with TiO2 nanoparticles coating the surface of the HCNF and sulfur homogeneously distributed in the coating layer. The HCNF@TiO2-S composite exhibited much better electrochemical performance than the HCNF-S composite, which delivered an initial discharge capacity of 1040 mA h g(-1) and maintained 650 mAh g(-1) after 200 cycles at a 0.5 C rate. The improvements of electrochemical performances might be attributed to the unique hybrid nanostructure of HCNF@TiO2 and good dispersion of sulfur in the HCNF@TiO2-S composite.

KEYWORDS:

cathodes; electrochemistry; hollow carbon nanofibers; hybrid nanostructures; lithium-sulfur batteries; titanium dioxide

PMID:
25413990
DOI:
10.1002/chem.201404686

Supplemental Content

Loading ...
Support Center