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

Dong Kyu Lee, Seon Joon Kim, Yong Jae Kim, Hyunji Choi, Dae Woo Kim, Hwan Jin Jeon, Chi Won Ahn, Jae W. Lee, Hee Tae Jung

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Article number1801992
JournalAdvanced Materials Interfaces
Volume6
Issue number7
DOIs
Publication statusPublished - 2019 Apr 9

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Electrochemical properties
Graphene
Carbon nanotubes
Physical properties
Polysulfides
Membranes
Sulfur
Oxides
Electrodes
Lithium
Separators
Carbon
Glass fibers
Functional groups
Monolayers
Electrolytes
Vacuum
Ions
Liquids

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Lee, Dong Kyu ; Kim, Seon Joon ; Kim, Yong Jae ; Choi, Hyunji ; Kim, Dae Woo ; Jeon, Hwan Jin ; Ahn, Chi Won ; Lee, Jae W. ; Jung, Hee Tae. / Graphene Oxide/Carbon Nanotube Bilayer Flexible Membrane for High-Performance Li–S Batteries with Superior Physical and Electrochemical Properties. In: Advanced Materials Interfaces. 2019 ; Vol. 6, No. 7.
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Graphene Oxide/Carbon Nanotube Bilayer Flexible Membrane for High-Performance Li–S Batteries with Superior Physical and Electrochemical Properties. / Lee, Dong Kyu; Kim, Seon Joon; Kim, Yong Jae; Choi, Hyunji; Kim, Dae Woo; Jeon, Hwan Jin; Ahn, Chi Won; Lee, Jae W.; Jung, Hee Tae.

In: Advanced Materials Interfaces, Vol. 6, No. 7, 1801992, 09.04.2019.

Research output: Contribution to journalArticle

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AU - Choi, Hyunji

AU - Kim, Dae Woo

AU - Jeon, Hwan Jin

AU - Ahn, Chi Won

AU - Lee, Jae W.

AU - Jung, Hee Tae

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