Boosting the polysulfides adsorption-catalysis process on carbon nanotube interlayer via a simple polyelectrolyte-assisted strategy for high-performance lithium sulfur batteries

●A multifunctional CNT/PDDA-TFSI interlayer was fabricated through a simple polyelectrolyte-assisted strategy.●The continuous CNT skeleton facilitates electron transport.●The interlayer ensures the effective polysulfides adsorption by electrostatic interaction.●The interlayer accelerates the lithium...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 894; p. 162556
Main Authors Fan, Xuliang, Wang, Yongyin, Zeng, Meng, He, Huimin, Huang, Jianyi, Feng, Ziwen, Li, Jing, Liang, Zhongxin, Zhou, Tao
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 15.02.2022
Elsevier BV
Subjects
Adsorption
Carbon nanotube
Carbon nanotubes
Catalysis
Electrochemical analysis
Electron transport
Interlayers
Lithium sulfur batteries
Lithium sulfur battery
Multifunctional interlayer
Polyelectrolyte
Polyelectrolytes
Polysulfides
Carbon nanotube
Polyelectrolyte
Multifunctional interlayer
Lithium sulfur battery
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Summary:●A multifunctional CNT/PDDA-TFSI interlayer was fabricated through a simple polyelectrolyte-assisted strategy.●The continuous CNT skeleton facilitates electron transport.●The interlayer ensures the effective polysulfides adsorption by electrostatic interaction.●The interlayer accelerates the lithium polysulfides conversion. [Display omitted] The introduction of conductive interlayer is an effective strategy to improve the sulfur utilization and restrict the migration of polysulfides for high-performance Li-S battery. Herein, a multifunctional CNT based interlayer was obtained by a simple polyelectrolyte (PDDA-TFSI) modified method. Due to the electro-positivity of PDDA-TFSI and the electronic coupling between CNT and PDDA-TFSI, the CNT/PDDA-TFSI interlayer exhibits a strong adsorption and effective catalysis towards polysulfides. Furthermore, the continuous CNT network ensures the successful electron transport during the charge-discharge process. As expected, the electrochemical properties of Li-S battery can be promoted significantly with the assistance of CNT/PDDA-TFSI interlayer. Even after 300 cycles, the CNT/PDDA-TFSI interlayer-based Li-S battery also delivers a higher capacity retention of 79.2%, proceeding Li-S batteries with and without CNT interlayer. This work proves that CNT/PDDA-TFSI film as a multifunctional interlayer has a promising application in advanced Li-S battery.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.162556