Issue 44, 2017

Understanding the function of cetyltrimethyl ammonium bromide in lithium/sulfur cells

Abstract

A surfactant material plays a significant role in creating a sulfur/carbon composite for lithium/sulfur cells. CTAB (cetyltrimethylammoniumbromide) is a widely used surfactant material in various fields. In this study we identified the functions of CTAB in a sulfur–graphene oxide composite used as the cathode material for lithium/sulfur cells, and the key features for enhancing the capacity of the cells. The CTAB added in the synthesis procedure reacts with polysulfides during the 155 °C heat treatment and produces cetylamine, cetylmethylamine, cetyldimetylamine, and dimethylpolysulfide as products. Furthermore the composite produced by the reactions between cetyldimetylamine and sulfur cover the surface of the sulfur. These work to enhance the performance of the cells. The findings presented here can be applied to various kinds of sulfur/carbon composites to enhance the performance of the sulfur electrode.

Graphical abstract: Understanding the function of cetyltrimethyl ammonium bromide in lithium/sulfur cells

Supplementary files

Article information

Article type
Paper
Submitted
26 Aug 2017
Accepted
17 Oct 2017
First published
18 Oct 2017

J. Mater. Chem. A, 2017,5, 23094-23102

Understanding the function of cetyltrimethyl ammonium bromide in lithium/sulfur cells

A. Kawase and E. J. Cairns, J. Mater. Chem. A, 2017, 5, 23094 DOI: 10.1039/C7TA07522G

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