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Title: Enabling effective polysulfide trapping and high sulfur loading via a pyrrole modified graphene foam host for advanced lithium-sulfur batteries
Authors: Zhang, K
Xie, KY
Yuan, K
Lu, W 
Hu, ST
Wei, W
Bai, MH
Shen, C
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry A, 2017, v. 5, no. 16, p. 7309-7315 How to cite?
Journal: Journal of materials chemistry A 
Abstract: Traditional Li-ion batteries are facing problems due to the intrinsic limitation of their low energy density. As one type of promising Li battery, lithium-sulfur (Li-S) batteries have an advantage of high theoretical energy density (2600 W h kg(-1)). Nevertheless, the notorious polysulfide shuttle and low sulfur loading are the main obstacles to widespread practical utilization of Li-S batteries. To tackle these issues, we design and construct a pyrrole modified graphene aerogel foam (Py-GF) by a simple hydrothermal and freeze drying method as the sulfur host, where pyrrole provides strong chemical bonding for polysulfide anchoring and graphene aerogel foam serves as a matrix to enhance the conductivity as well as increase the sulfur loading of the cathode simultaneously. The Py-GF@S cathode, with a high sulfur loading of about 6.2 mg cm(-2), displays an improved initial specific capacity (1220 mA h g(-1) at 0.2C and 985.8 mA h g(-1) at 0.5C) and cycle stability (capacity retention of 81% after 100 cycles at 0.5C). We anticipate that the work described here will be helpful to develop Li-S batteries that meet the requirements of practical applications.
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c7ta00445a
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