Issue 16, 2018

Nanopore-confined g-C3N4 nanodots in N, S co-doped hollow porous carbon with boosted capacity for lithium–sulfur batteries

Abstract

Benefiting from the high theoretical specific capacity and low cost consumption, lithium–sulfur batteries have been regarded as the promising next-generation energy storage technology. However, lithium–sulfur batteries still encounter a series of challenges such as low conductivity and serious volumetric expansion of sulfur during the discharge process as well as the stubborn “shuttle effect” of polysulfides. Such problems have greatly plagued the real applications of lithium–sulfur batteries. Herein, we have synthesized below-5-nm g-C3N4 nanodots based on a pore confinement effect, and they are embedded in a MOF-derived N, S co-doped hollow porous carbon shell (CN@NSHPC) via a unique double solvent-induced strategy. CN@NSHPC displays superior lithium polysulfide (LiPS) adsorptivity and a high sulfur loading of 73%. When applied as an electrode in lithium–sulfur batteries, the CN@NSHPC electrode delivers an excellent specific capacity of 1447 mA h g−1 at 0.2C, good rate capability of 387 mA h g−1 at 5C, and excellent cycling stability, specifically, only 0.048% decay per cycle at 1.0C over 500 cycles. This proposed strategy provides an insight into a new pathway to construct co-doped carbon hollow nanostructure and nanodot materials by the pore confinement effect.

Graphical abstract: Nanopore-confined g-C3N4 nanodots in N, S co-doped hollow porous carbon with boosted capacity for lithium–sulfur batteries

Supplementary files

Article information

Article type
Paper
Submitted
17 Janv. 2018
Accepted
19 Marts 2018
First published
20 Marts 2018

J. Mater. Chem. A, 2018,6, 7133-7141

Nanopore-confined g-C3N4 nanodots in N, S co-doped hollow porous carbon with boosted capacity for lithium–sulfur batteries

H. Zhang, Z. Zhao, Y. Hou, Y. Tang, Y. Dong, S. Wang, X. Hu, Z. Zhang, X. Wang and J. Qiu, J. Mater. Chem. A, 2018, 6, 7133 DOI: 10.1039/C8TA00529J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements