Transport Properties of Polysulfide Species in Lithium–Sulfur Battery Electrolytes: Coupling of Experiment and Theory

Safari, Mohammadhosein; Kwok, Chun Yuen; Nazar, Linda F.

doi:10.1021/acscentsci.6b00169

Cited by 73 publications

(69 citation statements)

References 44 publications

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“…On the other hand, the large number of ionic species in Li-S cells is likely to make the Stefan-Maxwell formulation for concentrated solution unwieldy in modelling Li-S cells, especially since the numerous concentration-dependent transport properties are difficult to obtain experimentally. Nazar et al [37] recently demonstrated the significance of cross-term diffusion coefficients in a ternary polysulfide solution containing S 2− 4 in LiTFSI-DOL/DME. It was discovered via concentration cell and constricted diffusion measurements that S limitation during cell discharge.…”

Section: −mentioning

confidence: 99%

Modelling transport-limited discharge capacity of lithium-sulfur cells

Zhang

Marinescu

Waluś

et al. 2016

Electrochimica Acta

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Lithium-sulfur (Li-S) battery could bring a step-change in battery technology with a potential specific energy density of 500 -600 Wh/kg. A key challenge for further improving the specific energy-density of Li-S cells is to understand the mechanisms behind reduced sulfur utilisation at low electrolyte loadings and high discharge currents. While several Li-S models have been developed to explore the discharge mechanisms of Li-S cells, they so far fail to capture the discharge profiles at high currents. In this study, we propose that the slow ionic transport in concentrated electrolyte is limiting the rate capability of Li-S cells. This transport-limitation mechanism is demonstrated through a one-dimensional Li-S model which qualitatively captures the discharge capacities of a sulfolane-based Li-S cell at different currents. Furthermore, our model predicts that a discharged Li-S cell is able regain some capacity with a short period of relaxation. This capacity recovery phenomenon is validated experimentally for different discharge currents and relaxation durations. The transport-limited discharge behavior of Li-S cells highlights the importance of optimizing the electrolyte loading and electrolyte transport property in Li-S cells.

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Section: −mentioning

confidence: 99%

Modelling transport-limited discharge capacity of lithium-sulfur cells

Zhang

Marinescu

Waluś

et al. 2016

Electrochimica Acta

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“…However, the severe shuttle effect and dendrite growth, and the inferior Coulombic efficiency that characterize these Li‐S batteries have greatly limited their lifespan 4, 8, 9, 10. Although much effort has been expended in the development of novel sulfur‐host electrodes,11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 separators,37, 38, 39, 40 and electrolytes41, 42, 43, 44, 45 to resolve these issues, some of which are rather dangerous, the results have been at best minimal in improving current Li‐S battery technology. As a result, the cycling life and Coulombic efficiency of Li‐S batteries, especially in the high‐rate regime, are still far behind the state of the art in lithium‐ion battery technology.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Suppression of the Dendrite Formation and Shuttle Effect in a Lithium–Sulfur Battery by Bilateral Solid Electrolyte Interface

et al. 2018

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Although the reversible and inexpensive energy storage characteristics of the lithium–sulfur (Li‐S) battery have made it a promising candidate for electrical energy storage, the dendrite growth (anode) and shuttle effect (cathode) hinder its practical application. Here, it is shown that new electrolytes for Li‐S batteries promote the simultaneous formation of bilateral solid electrolyte interfaces on the sulfur‐host cathode and lithium anode, thus effectively suppressing the shuttle effect and dendrite growth. These high‐capacity Li‐S batteries with new electrolytes exhibit a long‐term cycling stability, ultrafast‐charge/slow‐discharge rates, super‐low self‐discharge performance, and a capacity retention of 94.9% even after a 130 d long storage. Importantly, the long cycle stability of these industrial grade high‐capacity Li‐S pouch cells with new electrolytes will provide the basis for creating robust energy dense Li‐S batteries with an extensive life cycle.

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“…The composite also cycled well at 0.2 C rate, delivering an initial capacity of 1180 mAh/g and retaining a capacity of 680mAh/g in the 30th cycle. The electrochemical performance of the composite is an indirect indication of both the availability of the active material for energy conversion and the good physical and chemical confinement of polysulfide species by the polymer and the carbon matrix …”

Section: Resultsmentioning

confidence: 99%

“…The shuttling of the polysulfide species can drastically reduce the efficiency of the charge and discharge processes. In typical constant‐current discharge curves, this can result in high‐ and low‐voltage plateaus …”

Section: Resultsmentioning

confidence: 99%

Sulfur/PAN/acetylene black composite prepared by a solution processing technique for lithium–sulfur batteries

Krishnaveni

Subadevi

Raja

et al. 2018

J of Applied Polymer Sci

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A sulfur/poly(acrylonitrile)–PAN/acetylene black–AB composite, comprising sulfur and PAN encapsulated in the pores of AB was prepared by a solution‐based technique with dimethyl sulfoxide as the solvent. The composite was characterized by TGA, X‐ray diffraction, FTIR, Raman, SEM, TEM, and BET studies. The composite exhibited a high discharge capacity of 1330 mAh/g in the first cycle. The AB additive plays multiple roles in the composite, acting as a conducting matrix for electron transport and as a porous framework that adsorbs and retains electrolyte. The presence of PAN along with the porous carbon matrix in the composite provides the necessary resilience to absorb strains due to volume expansion during cycling. The observed improved performance of the composite is primarily attributed to the small size and homogeneous distribution of sulfur in the composite. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46598.

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Transport Properties of Polysulfide Species in Lithium–Sulfur Battery Electrolytes: Coupling of Experiment and Theory

Cited by 73 publications

References 44 publications

Modelling transport-limited discharge capacity of lithium-sulfur cells

Modelling transport-limited discharge capacity of lithium-sulfur cells

Simultaneous Suppression of the Dendrite Formation and Shuttle Effect in a Lithium–Sulfur Battery by Bilateral Solid Electrolyte Interface

Sulfur/PAN/acetylene black composite prepared by a solution processing technique for lithium–sulfur batteries

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