Bis(2,2,2-trifluoroethyl) Ether As an Electrolyte Co-solvent for Mitigating Self-Discharge in Lithium–Sulfur Batteries

Gordin, Mikhail L.; Dai, Fang; Chen, Shuru; Xu, Terrence; Song, Jiangxuan; Tang, Duihai; Azimi, Nasim; Zhang, Zhengcheng; Wang, Donghai

doi:10.1021/am501665s

Cited by 161 publications

(134 citation statements)

References 28 publications

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“…All the capacity retention and capacity degradation are calculated from the third cycle after achieving stabilized capacity. The achieved cycling ability in Figure 5c,d is much better than that of most previous reports 8, 9, 10, 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, 37, 38, 39, 40, 41, 42, 48. Only very recently, Cui and co‐workers51 successfully demonstrated that the TiO 2 /S yolk–shell composites can be cycled over 1000 times with a capacity decay of 0.033% per cycle.…”

Section: Resultscontrasting

confidence: 55%

“…However, the insulating nature of sulfur (S) and its reaction products (i.e., Li 2 S), the large volume expansion from S to Li 2 S, along with the dissolution of lithium polysulfide intermediates (i.e., Li 2 S x , 4 ≤ x ≤ 8) into liquid electrolyte and the consequent shuttling effect between the anode and cathode, makes it generally display poor rate ability, limited cycle life and severe self‐discharge 1, 2, 3, 4, 5, 6, 7. Therefore, a variety of strategies have been pursued to circumvent the sulfur cathode problems, including optimization of organic electrolytes8, 9 and fabrication of sulfur‐conductive polymer composites10, 11 and sulfur–carbon‐based composites 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, 37, 38, 39, 40, 41, 42, 43, 44, 45. Among these approaches, porous‐carbon/sulfur composites12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 are more attractive because porous carbon can i...…”

Section: Introductionmentioning

confidence: 99%

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Leaf‐Like Graphene‐Oxide‐Wrapped Sulfur for High‐Performance Lithium–Sulfur Battery

et al. 2015

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Carbon/sulfur composites are attracting extensive attention because of their improved performances for Li–S batteries. However, the achievements are generally based on the low S‐content in the composites and the low S‐loading on the electrode. Herein, a leaf‐like graphene oxide (GO), which includes an inherent carbon nanotube midrib in the GO plane, is synthesized for preparing GO/S composites. Owing to the inherent high conductivity of carbon nanotube midribs and the abundant surface groups of GO for S‐immobilization, the composite with an S‐content of 60 wt% exhibits ultralong cycling stability over 1000 times with a low capacity decay of 0.033% per cycle and a high rate up to 4C. When the S‐content is increased to 75 wt%, the composite still shows a perfect cycling performance over 1000 cycles. Even with the high S‐loading of 2.7 mg cm−2 on the electrode and the high S‐content of 85 wt%, it still shows a promising cycling performance over 600 cycles.

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Section: Resultscontrasting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Leaf‐Like Graphene‐Oxide‐Wrapped Sulfur for High‐Performance Lithium–Sulfur Battery

et al. 2015

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“…Due to the increased ion mobility and ionic conductivity, electrolytes with toluene additive have higher redox currents 132. Wang and co‐workers133 firstly reported BTFE with LiNO 3 to form significantly enhanced SEI film, which is a great step to obtain stable and non‐flammable electrolyte for LMBs. Hollenkamp and co‐workers discussed the effect of LiNO 3 additive and pyrrolidinium ionic liquid on the SEI in Li‐S cells and verified the participation of C 4 mpyr‐TFSI on the SEI formation on the anode 134…”

Section: Sei Regulationmentioning

confidence: 99%

A Review of Solid Electrolyte Interphases on Lithium Metal Anode

et al. 2015

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Lithium metal batteries (LMBs) are among the most promising candidates of high‐energy‐density devices for advanced energy storage. However, the growth of dendrites greatly hinders the practical applications of LMBs in portable electronics and electric vehicles. Constructing stable and efficient solid electrolyte interphase (SEI) is among the most effective strategies to inhibit the dendrite growth and thus to achieve a superior cycling performance. In this review, the mechanisms of SEI formation and models of SEI structure are briefly summarized. The analysis methods to probe the surface chemistry, surface morphology, electrochemical property, dynamic characteristics of SEI layer are emphasized. The critical factors affecting the SEI formation, such as electrolyte component, temperature, current density, are comprehensively debated. The efficient methods to modify SEI layer with the introduction of new electrolyte system and additives, ex‐situ‐formed protective layer, as well as electrode design, are summarized. Although these works afford new insights into SEI research, robust and precise routes for SEI modification with well‐designed structure, as well as understanding of the connection between structure and electrochemical performance, is still inadequate. A multidisciplinary approach is highly required to enable the formation of robust SEI for highly efficient energy storage systems.

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“…The synergetic functions are the result of (1) lower solubility of LiPS in the fluorinated electrolyte, (2) formation of an SEI layer on the surface of the sulfur/carbon cathode by the fluoroether solvent, 13 and (3) formation of the protective layer on the lithium anode by LiNO 3 and TTE reduction reaction. 13,19,26,27 Long-term self-discharge behavior of the cells with different electrolyte compositions was then evaluated by monitoring the voltage decay during resting. As shown in Figure 4a, the cell containing DOL/DME-1.0 M LiTFSI electrolyte without LiNO 3 additive showed severe shuttling during the 1 st and 2 nd charge.…”

Section: Resultsmentioning

confidence: 99%

“…13,19 Fluoroether-containing electrolytes have been reported by other groups to enhance the performance of the Liion battery due to their unique physical and chemical properties; [20][21][22][23] however, it is our idea to use it as an electrolyte co-solvent/additive for the Li-S battery. In this paper, we report the self-discharge characteristics of Li-S battery with the fluorinated electrolyte containing 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE).…”

mentioning

confidence: 99%

Fluorinated Electrolytes for Li-S Battery: Suppressing the Self-Discharge with an Electrolyte Containing Fluoroether Solvent

Azimi

Xue

Rago

et al. 2014

J. Electrochem. Soc.

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The fluorinated electrolyte containing a fluoroether 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) was investigated as a new electrolyte for lithium-sulfur (Li-S) batteries. The low solubility of lithium polysulfides (LiPS) in the fluorinated electrolyte reduced the parasitic reactions with Li anode and mitigated the self-discharge by limiting their diffusion from the cathode to the anode. The use of fluorinated ether as a co-solvent and LiNO 3 as an additive in the electrolyte shows synergetic effect in suppressing the self-discharge of Li-S battery due to the formation of the solid electrolyte interphase (SEI) on both sulfur cathode and the lithium anode. The Li-S cell with the fluorinated electrolyte showed prolonged shelf life at fully charged state. Lithium-sulfur (Li-S) batteries are considered to be promising candidates which can satisfy the demand for high energy density batteries in electronic and transportation devices due to their high theoretical capacity, intrinsic overcharge protection, low cost and nontoxicity. 1,2 Sulfur, one of the most abundant elements in the earth's crust, has a theoretical capacity value of 1675 mAh/g and is the cheapest solid state cathode material for energy storage devices.Despite the considerable advantages, there are several major issues that impede the practical applications of the Li-S battery.3 Sulfur undergoes a series of structural and morphological changes during charge and discharge, which results in the formation of soluble Li 2 S x (4 < x < 8) and insoluble Li 2 S 2 and Li 2 S. The formation of soluble lithium polysulfides (LiPS) and their chemical reaction with the electrolyte and lithium anode leads to low coulombic efficiency and rapid capacity fading. [4][5][6][7] In addition, Li-S battery suffers from severe self-discharge, which is the biggest hurdle for the commercialization of this battery. 8 A secondary battery will lose charge capacity when stored for a period of time at a certain temperature. This behavior is known as self-discharge and depends on the battery chemistry, electrode composition, choice of current collector, electrolyte formulation, and the storage temperature. For Li-S batteries, the self-discharge is a well-known issue due to the severe corrosion of lithium metal anode in the presence of the LiPS in the electrolyte. 5,6,8 Many attempts have been made to overcome the poor cycle life and low sulfur utilization of Li-S batteries.7-14 However, there are only a few publications focused on solving the self-discharge issue of the Li-S battery. Kazazi et al. have reported that the corrosion of the aluminum current collector and the shuttle mechanism play a significant role in the self-discharge of Li-S cells; therefore, LiNO 3 is a suitable electrolyte additive candidate to prevent self-discharge due to its effect on shuttle prevention.8 Mikhaylik and Akridge reported that self-discharge mainly attributed from the high plateau polysulfides. Electrolytes with higher salt concentration also showed lower rates of Li corrosion wit...

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Bis(2,2,2-trifluoroethyl) Ether As an Electrolyte Co-solvent for Mitigating Self-Discharge in Lithium–Sulfur Batteries

Cited by 161 publications

References 28 publications

Leaf‐Like Graphene‐Oxide‐Wrapped Sulfur for High‐Performance Lithium–Sulfur Battery

Leaf‐Like Graphene‐Oxide‐Wrapped Sulfur for High‐Performance Lithium–Sulfur Battery

A Review of Solid Electrolyte Interphases on Lithium Metal Anode

Fluorinated Electrolytes for Li-S Battery: Suppressing the Self-Discharge with an Electrolyte Containing Fluoroether Solvent

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