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Quaternary ammonium cationic polymer as a superior bifunctional binder for lithium – sulfur batteries and effects of counter anion

Title:

Quaternary ammonium cationic polymer as a superior bifunctional binder for lithium – sulfur batteries and effects of counter anion

Liao, Junbin and Ye, Zhibin (2017) Quaternary ammonium cationic polymer as a superior bifunctional binder for lithium – sulfur batteries and effects of counter anion. Electrochimica Acta . ISSN 00134686 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.electacta.2017.10.194

Abstract

Bifunctional polymer binders featured with both strong binding and superior polysulfide trapping properties are highly desired for the fabrication of sulfur cathodes with suppressed polysulfide shuttling in Li–S batteries. In this paper, we have explored the potential of a quaternary ammonium cationic polymer, polydiallyldimethylammonium (PDADMA-X; X = T, B, P, and Cl) with different counter anions (TFSI–, BF4−, PF6−, and Cl−, respectively) as the bifunctional binder. We have also revealed the dramatic effects of the counter anion on the performance of the cationic polymer binder. PDADMA-X's containing the former three weakly associating anions have been demonstrated to show polysulfide adsorption capability. In particular, PDADMA-T having the largest, least interacting TFSI– anion shows the optimum performance, with strong binding strength and the best polysulfide adsorption capability. Relative to commercial PVDF and PDADMA-X's of other counter anions, it offers sulfur cathodes with lowered polarization, higher discharge capacity, significantly better capacity retention, and improved cycling stability. With its convenient synthesis from commercially available PDADMA-Cl, cationic PDADMA-T having the TFSI– anion is a promising bifunctioal binder for sulfur cathodes in practical Li-sulfur batteries.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Chemical and Materials Engineering
Item Type:Article
Refereed:Yes
Authors:Liao, Junbin and Ye, Zhibin
Journal or Publication:Electrochimica Acta
Date:31 October 2017
Funders:
  • Canada Research Chair (CRC, Grant #230723)
  • Natural Sciences and Engineering Research Council of Canada (NSERC Grant # 477901-2015)
Digital Object Identifier (DOI):10.1016/j.electacta.2017.10.194
Keywords:Lithium-sulfur battery; Binders; Cathodes; Cationic polymers; Counter anions
ID Code:983150
Deposited By: DANIELLE DENNIE
Deposited On:02 Nov 2017 12:44
Last Modified:01 Nov 2018 00:00
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