Graphene Oxide/Carbon Nanotube Bilayer Flexible Membrane for High-Performance Li-S Batteries with Superior Physical and Electrochemical Properties

Title
Graphene Oxide/Carbon Nanotube Bilayer Flexible Membrane for High-Performance Li-S Batteries with Superior Physical and Electrochemical Properties
Authors
김선준이동규김용재최현지김대우전환진안치원이재우정희태
Keywords
carbon nanotube; flexible membrane; graphene oxide; interlayer; lithium-sulfur battery
Issue Date
2019-04
Publisher
Advanced materials interfaces
Citation
VOL 6, NO 7-1801992-9
Abstract
Developing a highly effective interlayer inserted between the sulfur electrode and separator is one of the most important issues in Li– S battery research, because this interlayer enhances the cycle performance of the Li– S battery by trapping the lithium polysulfides in the sulfur electrode. Among various interlayer materials, carbon materials such as graphene and carbon nanotubes are particularly appealing because of their high electrical conductivity. Here, a new flexible carbon membrane interlayer consisting of graphene oxide (GO) and carbon nanotubes (CNTs) is developed by a facile vacuum filtration approach to trap the lithium polysulfides in the sulfur electrode. When the GO/CNT bilayer membrane is used as an interlayer between the sulfur electrode and separator (glass fiber), the Li– S battery delivers an initial discharge capacity of 1591.56 mAh g− 1 and maintains a capacity of about 1000 mAh g− 1 over 50 cycles at 0.2C with a low potential difference of 150 mV. This reflects higher electrochemical performance than a GO or CNT monolayer unilaterally. This is attributed to the hydrophilic functional group of the GO layer strongly adsorbing lithium polysulfides dissolved in liquid electrolyte and the CNT layer enhancing the ion conductivity.
URI
http://pubs.kist.re.kr/handle/201004/70401
ISSN
2196-7350
Appears in Collections:
KIST Publication > Article
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