Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 3, 2016
Previous Article Next Article

Partially unzipped carbon nanotubes for high-rate and stable lithium–sulfur batteries

Author affiliations

Abstract

Lithium–sulfur (Li–S) batteries are attractive due to a high theoretical energy density and low sulfur cost. However, they have critical drawbacks such as drastic capacity fading during cycling, especially under high current density conditions. We report a suitable carbon matrix based on partially unzipped multi-walled carbon nanotubes (UZ.CNTs), which have favorable properties compared to multi-walled carbon nanotubes (MWCNTs) and fully unzipped nanoribbons (UZ.NRs). Partially unzipped walls of MWCNTs lead to increased surface area and pore volume with a retained electron conduction pathway. This also provides accessible inner pores as a stable reservoir for polysulfides. This reservoir is decorated with newly introduced oxygen containing functional groups, and affords a synergistic effect of shortening the depth that electrons penetrate and interacting with polysulfides for high-performance Li–S batteries. The synergistic effect is revealed by Monte Carlo simulations. The resulting partially unzipped MWCNT sulfur composite delivers 707.5 mA h g−1 at the initial discharge and retains 570.4 mA h g−1 after 200 cycles even at a high current rate of 5C (8375 mA g−1).

Graphical abstract: Partially unzipped carbon nanotubes for high-rate and stable lithium–sulfur batteries

Back to tab navigation

Supplementary files

Article information


Submitted
29 Sep 2015
Accepted
01 Nov 2015
First published
03 Nov 2015

J. Mater. Chem. A, 2016,4, 819-826
Article type
Paper

Partially unzipped carbon nanotubes for high-rate and stable lithium–sulfur batteries

Y. C. Jeong, K. Lee, T. Kim, J. H. Kim, J. Park, Y. S. Cho, S. J. Yang and C. R. Park, J. Mater. Chem. A, 2016, 4, 819
DOI: 10.1039/C5TA07818K

Social activity

Search articles by author

Spotlight

Advertisements