For Publishers
DiscoveryMetadataPeer reviewHostingPublishing
For Researchers
JoinPublishReviewCollect
Register
Blog
About
Search
Advanced search
My ScienceOpen
Search
For Publishers
For Researchers
Blog
About
4
views
38
references
 Top references
cited by
14
    
0 reviews
 Review
0
comments
 Comment
0
recommends
+1 Recommend
0 collections
    0
    shares
      30
      similar
       All similar
      • Record: found
      • Abstract: found
      • Article: not found

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

      research-article
      Author(s): , ,
      Publication date (Electronic):
      Journal: ACS Central Science
      Publisher: American Chemical Society

      Read this article at

      ScienceOpenPublisherPMC
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          A comprehensive experimental and theoretical analysis of the isothermal transport of species for the two model ternary-electrolytes with LiTFSI-Li 2S 4/dioxolane (DOL)-dimethoxyethane (DME) and LiTFSI-Li 2S 6/DOL-DME formulations is presented. An unambiguous picture of the polysulfide’s mobility is set forth after a detailed investigation of the macroscopic transference number and diffusion coefficients. The new findings of incongruent diffusion for Li 2S 4 species and high significance of cross-term diffusion coefficients reformulate a fledgling view of the prevalent redox-shuttle phenomena. The practical implications of this complex mechanism are discussed in detail.

          Abstract

          A comprehensive experimental and theoretical analysis of transport of Li 2S 4 and Li 2S 6 polysulfides reveals incongruent diffusion for Li 2S 4 and significance of cross-term diffusion coefficients relevant to redox-shuttle in Li−S batteries.

          Related collections

          Most cited references38

          • Record: found
          • Abstract: found
          • Article: not found

          The synergetic effect of lithium polysulfide and lithium nitrate to prevent lithium dendrite growth.

          Weiyang Li, Hongbin Yao, Kai Yan … (2015)
          Lithium metal has shown great promise as an anode material for high-energy storage systems, owing to its high theoretical specific capacity and low negative electrochemical potential. Unfortunately, uncontrolled dendritic and mossy lithium growth, as well as electrolyte decomposition inherent in lithium metal-based batteries, cause safety issues and low Coulombic efficiency. Here we demonstrate that the growth of lithium dendrites can be suppressed by exploiting the reaction between lithium and lithium polysulfide, which has long been considered as a critical flaw in lithium-sulfur batteries. We show that a stable and uniform solid electrolyte interphase layer is formed due to a synergetic effect of both lithium polysulfide and lithium nitrate as additives in ether-based electrolyte, preventing dendrite growth and minimizing electrolyte decomposition. Our findings allow for re-evaluation of the reactions regarding lithium polysulfide, lithium nitrate and lithium metal, and provide insights into solving the problems associated with lithium metal anodes.
          Article 0 comments Cited 474 times – based on 0 reviews     Review now
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            New approaches for high energy density lithium-sulfur battery cathodes.

            Scott Evers, Linda Nazar (2013)
            The goal of replacing combustion engines or reducing their use presents a daunting problem for society. Current lithium-ion technologies provide a stepping stone for this dramatic but inevitable change. However, the theoretical gravimetric capacity (∼300 mA h g(-1)) is too low to overcome the problems of limited range in electric vehicles, and their cost is too high to sustain the commercial viability of electrified transportation. Sulfur is the one of the most promising next generation cathode materials. Since the 1960s, researchers have studied sulfur as a cathode, but only recently have great strides been made in preparing viable composites that can be used commercially. Sulfur batteries implement inexpensive, earth-abundant elements at the cathode while offering up to a five-fold increase in energy density compared with present Li-ion batteries. Over the past few years, researchers have come closer to solving the challenges associated with the sulfur cathode. Using carbon or conducting polymers, researchers have wired up sulfur, an excellent insulator, successfully. These conductive hosts also function to encapsulate the active sulfur mass upon reduction/oxidation when highly soluble lithium polysulfides are formed. These soluble discharge products remain a crux of the Li-S cell and need to be contained in order to increase cycle life and capacity retention. The use of mesoporous carbons and tailored designs featuring porous carbon hollow spheres have led to highly stable discharge capacities greater than 900 mA h g(-1) over 100 cycles. In an attempt to fully limit polysulfide dissolution, methods that rely on coating carbon/sulfur composites with polymers have led to surprisingly stable capacities (∼90% of initial capacity retained). Additives will also play an important role in sulfur electrode design. For example, small fractions (> 3 wt%) of porous silica or titania effectively act as polysulfide reservoirs, decreasing their concentration in the electrolyte and leading to a higher utilization of sulfur and increased capacities.
            Article 0 comments Cited 320 times – based on 0 reviews     Review now
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Lithium sulfur batteries, a mechanistic review

              R. Purkayastha, G Minton, M Marinescu … (2015)
              Lithium sulfur batteries, review of current mechanistic understanding and the gap between experimentally derived mechanisms and those used for modelling. Lithium sulfur (Li–S) batteries are one of the most promising next generation battery chemistries with potential to achieve 500–600 W h kg −1 in the next few years. Yet understanding the underlying mechanisms of operation remains a major obstacle to their continued improvement. From a review of a range of analytical studies and physical models, it is clear that experimental understanding is well ahead of state-of-the-art models. Yet this understanding is still hindered by the limitations of available techniques and the implications of experiment and cell design on the mechanism. The mechanisms at the core of physical models for Li–S cells are overly simplistic compared to the latest thinking based upon experimental results, but creating more complicated models will be difficult, due to the lack of and inability to easily measure the necessary parameters. Despite this, there are significant opportunities to improve models with the latest experimentally derived mechanisms. Such models can inform materials research and lead to improved high fidelity models for controls and application engineers.
              Article 0 comments Cited 265 times – based on 0 reviews     Review now
                Bookmark
                All references

                Author and article information

                Journal
                Journal ID (nlm-ta): ACS Cent Sci
                Journal ID (iso-abbrev): ACS Cent Sci
                Journal ID (publisher-id): oc
                Journal ID (coden): acscii
                Title: ACS Central Science
                Publisher: American Chemical Society
                ISSN (Print): 2374-7943
                ISSN (Electronic): 2374-7951
                Publication date (Electronic): 28 July 2016
                Publication date (Print): 24 August 2016
                Volume: 2
                Issue: 8
                Pages: 560-568
                Affiliations
                [1]Department of Chemistry, University of Waterloo , 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
                Author notes
                Article
                DOI: 10.1021/acscentsci.6b00169
                PMC ID: 4999976
                SO-VID: 36cee9de-869e-4094-b00c-cff981148114
                Copyright © Copyright © 2016 American Chemical Society
                License:

                This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

                History
                Date received : 09 June 2016
                Categories
                Subject: Research Article
                Custom metadata
                document-id-old-9 oc6b00169
                document-id-new-14 oc-2016-00169a
                ccc-price

                Data availability:

                Comments

                Comment on this article

                scite_

                Similar content30

                See all similar

                Cited by14

                See all cited by

                Most referenced authors340

                See all reference authors