Improving the performance of PEDOT-PSS coated sulfur@activated porous graphene composite cathodes for lithium–sulfur batteries

Li, Han; Sun, Minqiang; Zhang, Tao; Fang, Yuqian; Wang, Gengchao

doi:10.1039/c4ta03366c

Cited by 87 publications

(64 citation statements)

References 75 publications

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“…The ionic (lithium) conductivity in PEDOT:PSS has been estimated to be on the order of 10 -6 S cm -1 [61,62]. Despite PEDOT:PSS not allowing very high ionic transport, it has been speculated that a nanoscale-thick PEDOT:PSS coating layer would be too thin to slow down the overall kinetics of the electrochemical process, as we observed in previous results [60,63,64]. We formed a conformal layer of PEDOT:PSS with a coating of 0.07 mg cm -2 by spray-coating onto the pristine separator; a cross-sectional image of the bifunctional separator revealed (Figure 1b) the thickness of the PEDOT:PSS film to be approximately 800 nm.…”

Section: Resultssupporting

confidence: 58%

Bifunctional separator as a polysulfide mediator for highly stable Li–S batteries

Abbas

Ibrahem

et al. 2016

J. Mater. Chem. A

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CitationBifunctional separator as a polysulfide mediator for highly stable Li-S batteries 2016 J. Graphical Abstract ABSTRACTThe shuttling process involving lithium polysulfides is one of the major factors responsible for the degradation in capacity of lithium-sulfur batteries (LSBs). Herein, we demonstrate a novel and simple strategy-using a bifunctional separator, prepared by spraying poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) on pristine separator-to obtain long-cycle LSBs. The negatively charged SO 3 -groups present in PSS act as an electrostatic shield for soluble lithium polysulfides through mutual coulombic repulsion, whereas PEDOT provides chemical interactions with insoluble polysulfides (Li 2 S, Li 2 S 2 ). The dual shielding effect can provide an efficient protection from the shuttling phenomenon by confining lithium polysulfides to the cathode side of the battery. Moreover, coating with PEDOT:PSS transforms the surface of the separator from hydrophobic to hydrophilic, thereby improving the electrochemical performance. We observed an ultralow decay of 0.0364% per cycle when we ran the battery for 1000 cycles at 0.25 C-far superior to that of the pristine separator and one of the lowest recorded values reported at a low current density. We examined the versatility of our separator by preparing a flexible battery that functioned well under various stress conditions; it displayed flawless performance. Accordingly, this economical and simple strategy appears to be an ideal platform for commercialization of LSBs.

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Section: Resultssupporting

confidence: 58%

Bifunctional separator as a polysulfide mediator for highly stable Li–S batteries

Abbas

Ibrahem

et al. 2016

J. Mater. Chem. A

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“…1 33 the XRD patterns suggest that the coating process with solution-based PEDOT:PSS does not disturb the structural characteristics of the sulfur material. Fig.…”

Section: Resultsmentioning

confidence: 97%

“…31 Yi Cui et al 32 and Wang et al 33 studied the effect of a coating of conducting polymer on a sulfur/carbon and sulfur/graphene composites, respectively, using an additional heat-treatment process to obtain carbon/sulfur materials before coating with poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS). Although the previous reports mentioned above addressed the improved electrochemical performances of sulfur electrodes, the incorporation of carbon or graphene materials lead to the decrease in volumetric energy density of sulfur electrodes.…”

Section: −30mentioning

confidence: 99%

Surface Modification of Sulfur Cathodes with PEDOT:PSS Conducting Polymer in Lithium-Sulfur Batteries

Lee

Choi

2015

J. Electrochem. Soc.

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Sulfur powder was coated with poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS) using a wet mixing process in water. The modified sulfur material was investigated for use as a cathode in lithium-sulfur (Li-S) batteries. The surface modification with the conducting polymer was identified with Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) analyses. Electrochemical evaluation revealed that surface modification with PEDOT:PSS leads to increases in initial capacity and improvements in the rate capability and cyclability of sulfur electrodes. Electrochemical impedance spectroscopy (EIS) measurements certified a decreased resistance of the PEDOT:PSS-coated sulfur electrode compared to a pure sulfur electrode, indicating that surface modification with a conducting polymer effectively enhanced the electrochemical performance of sulfur electrodes in Li-S batteries.

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“…The first discharge plateau is relatively shorter, whereas the second discharge extends longer and contributes to the main discharge capacity. For G/S-200 composite, the first plateau around 2.25 V can be assigned to the reduction of sulfur to higher-order lithium polysulfides (Li2Sn, 4 n 8), and the second plateau around 2.05 V is caused by the changes from higher-order lithium polysulfides to lower-order lithium polysulfides (Li2S2 or Li2S) [43]. The G/S-200 shows the smallest potential separation between the charge and discharge plateaus among the composites, indicating the best kinetic characteristics [44].…”

Section: Resultsmentioning

confidence: 99%

Facile assembly of partly graphene-enveloped sulfur composites in double-solvent for lithium–sulfur batteries

Wei

Yuan

Chen

et al. 2015

Electrochimica Acta

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Improving the performance of PEDOT-PSS coated sulfur@activated porous graphene composite cathodes for lithium–sulfur batteries

Abstract: A novel PEDOT/S@aPG composite with good cycling stability and excellent rate capability is prepared.

Cited by 87 publications

References 75 publications

Bifunctional separator as a polysulfide mediator for highly stable Li–S batteries

Bifunctional separator as a polysulfide mediator for highly stable Li–S batteries

Surface Modification of Sulfur Cathodes with PEDOT:PSS Conducting Polymer in Lithium-Sulfur Batteries

Facile assembly of partly graphene-enveloped sulfur composites in double-solvent for lithium–sulfur batteries

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