Effect of Fluoroethylene Carbonate on Electrochemical Performances of Lithium Electrodes and Lithium-Sulfur Batteries

Song, Juhye; Yeon, Jin-Tak; Jang, Jun-Yeong; Han, Jung‐Gu; Lee, Sang‐Min; Choi, Nam‐Soon

doi:10.1149/2.101306jes

Cited by 71 publications

(68 citation statements)

References 40 publications

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“…[ 201 ] Alternative additives to LiNO 3 , such as lithium bisoxalatoborate, [ 202 ] P 2 S 5 , [ 203 ] LiClO 4 , [ 161 ] and fl uoroethylene carbonate solvent, [ 204 ] were also found to positively modify the passivation layer on the lithium surface, mitigating the shuttling reaction. A good passivation layer needs to be a good lithium-ion conductor so that it will not block the lithium transport pathway through charge/discharge; meanwhile, the layer has to be condensing enough to block polysulfi de diffusion in case it continuingly reacts with lithium metal.…”

Section: Protection Of Metallic Lithium Anode From Dissolved Polysulfmentioning

confidence: 99%

Progress in Mechanistic Understanding and Characterization Techniques of Li‐S Batteries

Lü

Amine

2015

Advanced Energy Materials

436

336

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Rechargeable lithium‐sulfur batteries that operate at room temperature have attracted much research interest as next‐generation energy storage systems. Although tremendous advances have been made with Li‐S batteries, great challenges still exist in achieving high capacity, high loading, high coulombic efficiency, and long cycle life. These challenges arise from the system complexity, lack of mechanistic understanding of the redox reaction, and operational limitations of Li‐S cells. The focus here is on the recent gains in fundamental understanding of the Li‐S redox reaction mechanism based on the application of advanced characterization techniques. Research results that help with the understanding of the close relationship between cell design (including development of new and advanced electrode materials, electrolytes, separators, binders, and cell configurations), the Li‐S reaction mechanism, characterization methods, and Li‐S battery performance are discussed.

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Section: Protection Of Metallic Lithium Anode From Dissolved Polysulfmentioning

confidence: 99%

Progress in Mechanistic Understanding and Characterization Techniques of Li‐S Batteries

Lü

Amine

2015

Advanced Energy Materials

436

336

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“…Energy Mater. 2015, 1402273 www.MaterialsViews.com www.advenergymat.de [ 64 ] studied the effect of fl uoroethylene carbonate (FEC) as a co-solvent in electrolytes on the electrochemical performance of the Li metal anode in Li-S batteries. The Li|Li symmetric cells with the etherbased electrolytes, 1 M LiPF 6 in tetra(ethylene glycol) dimethyl ether (TEGDME) with and without FEC, showed quite different performances.…”

Section: Dendrite Prevention In Li-s Batteries Using Liquid Electrmentioning

confidence: 99%

Anodes for Rechargeable Lithium‐Sulfur Batteries

Cao

et al. 2015

Advanced Energy Materials

457

311

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this makes it one of the most promising candidates to meet the energy needs for powering future EVs. [ 6,[19][20][21][22][23][24][25][26] Research on Li-S batteries began in the early 1960s. [ 24,27 ] In the following fi ve decades, only limited progress was made based on sporadic research efforts in this fi eld. Recently, in the light of nanoporous carbon materials, the cell performance was greatly improved and the research passion on Li-S batteries has been revived. [ 20,28,29 ] Unlike Li-ion batteries that use Li + -ion insertion chemistry in intercalation inorganic compounds for both cathode and anode, Li-S batteries are based on a conversion reaction of S forming Li 2 S via polysulfi des as intermediate species (Li 2 S n , n = 4-8), which could deliver a high specifi c capacity of 1672 mAh g −1 . [ 20,24 ] However, to realize commercial Li-S batteries, there are still many technical challenges to be solved from cathode to anode, as well as electrolyte. [ 22,30,31 ] The performances of different components in Li-S batteries are often related to each other. For example, the improvements in S based cathode could benefi t from reduced degradation in metallic Li anode by minimizing polysulfi de migration and shuttle effect. In general, Li-S batteries suffer from low S utilization and short cycle life, which originate from poor conductivity of sulfur and its discharged product Li 2 S, self-discharge, large volume expansion (≈80%) upon the formation of Li 2 S, and the dissolution of polysulfi des in liquid electrolytes. [ 24,32,33 ] The insulating nature of S and the large volume expansion of S cathode upon discharge can be largely overcome via forming nanocomposite with highly porous carbon materials, which could greatly improve the S utilization and rate performance. [ 21,25,32,34 ] In addition, the porous cathode structure could hold the formed polysulfi des in the pores so as to reduce the degree of dissolution of polysulfi des into the electrolyte. Recently, it was also found that the synthesis of metastable small S molecules of S 2-4 confi ned in a conductive microporous carbon matrix could avoid the unfavorable formation of long chain polysulfi des, thus avoiding the S dissolution problem. [35][36][37] Although signifi cant improvements have been made in the cyclability of S/C composite cathodes, [ 21,24,28,38 ] there are still many problems involved in Li-S batteries before this technology can be adopted for practical applications. In contrast to the enormous research efforts on S cathode side, the Li metal anode in Li-S batteries, which is directly involved in the shuttle mechanism and the capacity failure, has attracted much less attention. [ 24,39 ] Recently, with the signifi cant improvements in the development of high capacity S cathodes using stable C/S composites, the research spotlight is falling on the anode side With the signifi cant progress that has been made toward the development of cathode materials and electrolytes in lithium-sulfur (Li-S) batteries in recent years, the stability of the anod...

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“…6a compares the SEI compositional variation with the increased detection depth in the DOL/TTE system, showing F 1s, N 1s, and S 2p spectra. It can be seen that the intensity of the F 1s signal at 689.5 eV corresponding to fluorine-and oxygen-containing species is dominant on the first SEI layer but Please do not adjust margins Please do not adjust margins drops after sputtering for 4 s. 41,42 After sputtering for 4 s, i.e., down to a distance of ~ 2 nm from the top interface, a new peak at 685.5 eV emerges, suggesting the enriching of LiF species. 41,42 With an increased detection depth of ~ 150 nm beneath the top interface (after sputtering for 300 s), the intensity of the peak at 685.5 eV increases, indicating that LiF accumulates near the lithium-metal surface.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte

et al. 2015

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High energy density Li-S battery is a promising green battery chemistry, but the polysulfide shuttling and lithium anode degradation hinder the practical use of Li-S batteries. Tremendous efforts have been made including confining sulfur in a closed cathode porous matrix and stabilizing lithium-metal anode with additives; however, satisfactory confinement is challenging to achieve and electrolyte additives could be electrochemically unstable, deteriorating the long-term cyclability of Li-S batteries. Here, we demonstrate the control of polysulfide shuttling and stabilization of the lithium-metal anode with a fluorinated ether electrolyte without either cathode confinement or additives, which can be beneficial for both the efficient use of electrolyte and safe operation of Li-S batteries. Moreover, solid-electrolyte interphase (SEI) layer with a hierarchical chemical composition of LiF and sulfate/sulfite/sulfide was identified on lithium anode, which suppresses parasitic reactions and helps preserve the anode quality.

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Effect of Fluoroethylene Carbonate on Electrochemical Performances of Lithium Electrodes and Lithium-Sulfur Batteries

Cited by 71 publications

References 40 publications

Progress in Mechanistic Understanding and Characterization Techniques of Li‐S Batteries

Progress in Mechanistic Understanding and Characterization Techniques of Li‐S Batteries

Anodes for Rechargeable Lithium‐Sulfur Batteries

Insight into lithium–metal anodes in lithium–sulfur batteries with a fluorinated ether electrolyte

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