The impact of polymeric binder on the morphology and performances of sulfur electrodes in lithium–sulfur batteries

Shafique, Ahmed; Rangasamy, Vijay Shankar; Vanhulsel, Annick; Safari, Mohammadhosein; Bael, Marlies K. Van; Hardy, An; Sallard, Sébastien

doi:10.1016/j.electacta.2020.136993

Cited by 17 publications

(43 citation statements)

References 44 publications

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“…This might be explained by a microstructural rearrangement within the porous electrode due to the volume changes during the (dis)charge step. We did not report such anomalous first discharge previously with raw sulfur and LiPAA as the binders . However, in the present case, the areal sulfur loading was increased by 12.5% up to 4.5 mg/cm 2 .…”

Section: Resultscontrasting

confidence: 70%

“…Each sample was tested with at least five different Li–S cells using an electrode protocol with LiPAA as a binder and (Figure a–d) obtained good repeatability of the electrochemical properties . Compared to all other samples, the reproducibility clearly improved for Li–S cells containing the optimum-PEDOT-coated sulfur powder.…”

Section: Resultsmentioning

confidence: 94%

“…Raw and PEDOT-coated sulfur-based electrodes were prepared with an established protocol . Typically, a tape casting method was used by mixing sulfur, carbon black, and binder (LiPAA) with a composition of 66:24:10 in weight ratio using mechanical stirring at 650 rpm for 15 min.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The scan rate of the linear sweep voltammetry (LSV) tests was 0.1 mV/s over a voltage range of 1.5–5.0 V vs Li + /Li. Postmortem SEM analysis of the electrodes was performed as reported in our previous article …”

Section: Experimental Sectionmentioning

confidence: 99%

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Dielectric Barrier Discharge (DBD) Plasma Coating of Sulfur for Mitigation of Capacity Fade in Lithium–Sulfur Batteries

Shafique

Rangasamy

Vanhulsel

et al. 2021

ACS Appl. Mater. Interfaces

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Sulfur particles with a conductive polymer coating of poly(3,4ethylene dioxythiophene) "PEDOT" were prepared by dielectric barrier discharge (DBD) plasma technology under atmospheric conditions (low temperature, ambient pressure). We report a solvent-free, low-cost, low-energyconsumption, safe, and low-risk process to make the material development and production compatible for sustainable technologies. Different coating protocols were developed to produce PEDOT-coated sulfur powders with electrical conductivity in the range of 10 −8 −10 −5 S/cm. The raw sulfur powder (used as the reference) and (low-, optimum-, high-) PEDOT-coated sulfur powders were used to assemble lithium−sulfur (Li−S) cells with a high sulfur loading of ∼4.5 mg/cm 2 . Long-term galvanostatic cycling at C/10 for 100 cycles showed that the capacity fade was mitigated by ∼30% for the cells containing the optimum-PEDOT-coated sulfur in comparison to the reference Li−S cells with raw sulfur. Rate capability, cyclic voltammetry, and electrochemical impedance analyzes confirmed the improved behavior of the PEDOT-coated sulfur as an active material for lithium−sulfur batteries. The Li−S cells containing optimum-PEDOT-coated sulfur showed the highest reproducibility of their electrochemical properties. A wide variety of bulk and surface characterization methods including conductivity analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and NMR spectroscopy were used to explain the chemical features and the superior behavior of Li−S cells using the optimum-PEDOT-coated sulfur material. Moreover, postmortem [SEM and Brunauer−Emmett−Teller (BET)] analyzes of uncoated and coated samples allowed us to exclude any significant effect at the electrode scale even after 70 cycles.

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Section: Resultscontrasting

confidence: 70%

Section: Resultsmentioning

confidence: 94%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

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Dielectric Barrier Discharge (DBD) Plasma Coating of Sulfur for Mitigation of Capacity Fade in Lithium–Sulfur Batteries

Shafique

Rangasamy

Vanhulsel

et al. 2021

ACS Appl. Mater. Interfaces

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“…Currently, PVDF binder has been successfully commercialized in traditional LIBs due to its strong adhesion property and superior chemical stability in the organic electrolyte. [ 154 ] Unfortunately, PVDF binder generally exhibits dissatisfied electrochemical performance when used in LSBs. First, the weak adhesion of PVDF based on van der Waals forces is not enough to withstand huge volume expansion of sulfur cathode and maintain the electrode integrity during discharge/charge process.…”

Section: Polymer Binders In Cathodesmentioning

confidence: 99%

Polymers in Lithium–Sulfur Batteries

et al. 2021

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Lithium–sulfur batteries (LSBs) hold great promise as one of the next‐generation power supplies for portable electronics and electric vehicles due to their ultrahigh energy density, cost effectiveness, and environmental benignity. However, their practical application has been impeded owing to the electronic insulation of sulfur and its intermediates, serious shuttle effect, large volume variation, and uncontrollable formation of lithium dendrites. Over the past decades, many pioneering strategies have been developed to address these issues via improving electrodes, electrolytes, separators and binders. Remarkably, polymers can be readily applied to all these aspects due to their structural designability, functional versatility, superior chemical stability and processability. Moreover, their lightweight and rich resource characteristics enable the production of LSBs with high‐volume energy density at low cost. Surprisingly, there have been few reviews on development of polymers in LSBs. Herein, breakthroughs and future perspectives of emerging polymers in LSBs are scrutinized. Significant attention is centered on recent implementation of polymers in each component of LSBs with an emphasis on intrinsic mechanisms underlying their specific functions. The review offers a comprehensive overview of state‐of‐the‐art polymers for LSBs, provides in‐depth insights into addressing key challenges, and affords important resources for researchers working on electrochemical energy systems.

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Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

Sun

Shi

et al. 2021

Adv Funct Materials

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Binders play an important role in battery systems. The lithium-sulfur (Li-S) batteries have poor cycling performance owing to large volume alteration of sulfur and shuttle effect. Herein, a novel water-soluble functional binder (named GN-BA) is prepared by the cross-linking effect between gelatin and boric acid. The excellent binder can effectively maintain the integrated electrode stable, buffer the volume changes, prevent active materials exfoliation from current collectors, and anchor polysulfides by chemical bonding. Sulfur electrodes in this binder also exhibit a loosely stacked porous structure, which is advantageous to the electrolyte permeation and fast ion diffusion. X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, and density functional theory calculations further verified that the binder can anchor polysulfides by forming BOLi, COLi, and CNLi chemical bonds. At 0.5 C, a high initial capacity of 980 mA h g −1 can be obtained, which is higher than those sulfur cathodes with traditional poly(vinylidene fluoride) binder. When the sulfur loading is up to 5.0 mg cm −2 , a high areal specific capacity of 5.7 mA h cm −2 and excellent cycling stability are achieved. This study proposes an economical and environmentally friendly strategy for the construction of advanced binders and promotes the practical application of high-energy Li-S batteries.

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The impact of polymeric binder on the morphology and performances of sulfur electrodes in lithium–sulfur batteries

Cited by 17 publications

References 44 publications

Dielectric Barrier Discharge (DBD) Plasma Coating of Sulfur for Mitigation of Capacity Fade in Lithium–Sulfur Batteries

Dielectric Barrier Discharge (DBD) Plasma Coating of Sulfur for Mitigation of Capacity Fade in Lithium–Sulfur Batteries

Polymers in Lithium–Sulfur Batteries

Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

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