Phase Inversion Strategy to Flexible Freestanding Electrode: Critical Coupling of Binders and Electrolytes for High Performance Li–S Battery

Wandi Wahyudi, Zhen Cao, Pushpendra Kumar, Mengliu Li, Yingqiang Wu, Mohammed N. Hedhili, Thomas D. Anthopoulos, Luigi Cavallo, Lain Jong Li, Jun Ming*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Development of flexible and freestanding electrode is attracting great attention in lithium–sulfur (Li–S) batteries, but the severe capacity fading caused by the lithium polysulfides (PSs) shuttle effect remains challenging. Herein, a completely new polymeric binder of polyethersulfone is introduced. Not only it enables massive production of flexible/current-free electrode by a novel concept of “phase-inversion” approach but also the resultant polymeric networks can effectively trap the soluble polysulfides within the electrode, owing to the higher hydrophilicity and stronger affinity properties than the routine polyvinylidene fluoride. Coupling with polysulfide-based electrolyte, the Li–S cell shows a higher capacity of 1141 mAh g−1, a lower polarization of 192 mV, and a more stable capacity retention with 100% Coulombic efficiency over 100 cycles at 0.25C. The advantages of favored binder and electrolyte are further demonstrated in lithium-ion sulfur full battery with lithiated graphite anode, which demonstrates much improved performance than those previously reported. This work not only introduces a novel strategy for flexible freestanding electrodes but also enlightens the importance of coupling electrodes and electrolytes to higher performances for Li–S battery.

Original languageEnglish (US)
Article number1802244
JournalAdvanced Functional Materials
Volume28
Issue number34
DOIs
StatePublished - Aug 22 2018

Bibliographical note

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • flexible freestanding electrodes
  • lithium–sulfur batteries
  • phase inversion
  • polyethersulfone
  • polysulfide-modified electrolytes

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science

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