Enhanced performance of Li-S battery with polymer doped potassium functionalized graphene interlayers as effective polysulfide barrier


Kiai M. S. , Kızıl H.

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, vol.851, 2019 (SCI-Expanded) identifier identifier

Abstract

In this study, the electrochemical performances of the novel glass fiber separators coated with potassium functionalized graphene (K-FGF) doped with polyaniline (PANI), poly 1,5-diaminoanthraquinone (PDAAQ) and PDAAQ/multi wall carbon nanotubes (MWCNT)/cetyltrimethyl-ammoniurn-bromide (CTAB) were evaluated for their ability of polysulfide entrapment to improve the cycling stability and the capacity fading rate. The test results showed that K-FGF coated glass fiber separator doped with PDAAQ and PDAAQ/MWCNT/CTAB displayed incredible improvement in the electrochemical performance of the battery, with high initial capacity of 1346 and 1361 mAh g(-1) and capacity retention of 804 and 968 mAh g(-1) after 200 cycles respectively. It is evident that PDAAQ suppresses the polysulfides shuttle in the electrolyte and offers a strong binding energy for the adsorption of polysulfides on the separator surface. (C) 2019 Elsevier B.V. All rights reserved.