Enhanced separator wettability by LiTFSI and its application for lithium metal batteries

Xie, Yong; Xiang, Hongfa; Shi, Pengcheng; Guo, Jipeng; Wang, Haihui

doi:10.1016/j.memsci.2016.11.021

Cited by 71 publications

(51 citation statements)

References 24 publications

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“…[12] Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is another commonly used salt for LMBs and has been reported for its good separator wettability and dendrite suppression. [13] Unfortunately, LiTFSI-based electrolytes come with a set of disadvantages for LMBs: 1) aluminum current collectors can corrode in LiTFSI-based electrolytes during cycling to form Al(TFSI) 3 and 2) dilute LiTFSI-based electrolytes give rise to an SEI layer that lacks LiF, which is an important component for a stable SEI layer. [9c,12,14] Apart from the mentioned lithium salts, several attempts have been made to improve performances of LMBs by incorporating new lithium salts.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes

Pham

Faheem

Chun

et al. 2021

Advanced Energy Materials

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Lithium metal batteries (LMBs) have the potential to deliver a greater specific capacity than any commercially used lithium battery. However, excessive dendrite growth and low Coulombic efficiencies (CEs) are major hurdles preventing the commercialization of LMBs. In this study, two different salts, lithium difluorophosphate (LiDFP) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), are chosen for use in concentrated electrolytic systems. By mixing salts with vastly different cation–anion interaction energies, the ion solvation structures in the electrolyte can be modulated to enhance the physical/electrochemical properties and suppress Li dendrite growth in LMBs. Among the investigated electrolyte systems, 2.2 m LiDFP + 1.23 m LiTFSI in 1,2‐dimethoxyethane is proposed as a highly promising electrolyte system because of its high conductivity (6.57 mS cm−1), CE (98.3%), and the formation of an extremely stable solid–electrolyte interface layer. The bisalt electrolyte presented herein, as well as the associated concepts, provide a new avenue toward commercial LMBs.

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Section: Introductionmentioning

confidence: 99%

Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes

Pham

Faheem

Chun

et al. 2021

Advanced Energy Materials

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show abstract

“…On the basis of the previous studies [12][13][14][15][16]31], the solvent, the lithium-salt type and its concentration may affect the wettability determined by the contact angle. However, few systematic studies address the effect of salt concentration on surface tension and contact angle.…”

Section: Discussionmentioning

confidence: 99%

“…Wetting properties are determined by the contact angle [11]. Numerous studies show that insufficient wetting gives poor battery performance [12][13][14][15][16]. However, few systematic studies address the effect of salt concentration on surface tension and contact angle.…”

Section: Introductionmentioning

confidence: 99%

Wetting behavior of four polar organic solvents containing one of three lithium salts on a lithium-ion-battery separator

Sun

Radke

McCloskey

et al. 2018

Journal of Colloid and Interface Science

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For DMSO, PC and PC/DMC, surface tensions increase by adding LiClO or LiPF but decrease upon addition of LiTFSI. For DMC, the lithium salts have little impact on the surface tensions. For each solvent, contact angles and adhesion energies follow the same trend as those for surface tensions. The TFSI- anion reduces the surface tension of the solvent, favoring good wettability of the separator. The optimal surface tension for wettability of Celgard 2500 is at or below 26.1 mN/m.

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“…A smaller contact angle usually means higher wettability, which often connotes an improved cycle performance and lifespan of a cell. [ 69,99–101 ]…”

Section: Characterization Of Separatormentioning

confidence: 99%

Recent advances in separator engineering for effective dendrite suppression of Li‐metal anodes

et al. 2021

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Lithium dendrites cause battery failures and safety hazards in liquid‐electrolyte lithium‐based batteries. To address this problem, each component of the battery, such as cathode, anode, electrolyte and separator, should be well matched and engineered for the integrated battery system. The separator plays an increasingly important role owing to its gradual transformation from an inert to an active component in the battery, especially for resolving Li dendrite issues in Li‐metal batteries. Armed with advanced nanotechnology solutions, separator engineering presents a formidable strategy to suppress dendrite growth dynamics by modifying the electrolyte chemistry, regulating/trapping unwanted ionic species and redirecting dendrite growth direction. This review summarizes recent advances in separator engineering for effective dendrite suppression of Li‐metal anodes. We first introduce the challenges that the Li‐metal anode faces and the irreplaceable role of separators in the battery system. The characterization parameters and design principles of separators are also discussed. Then, the mainstream techniques for separator functionalization and their impacts on dendrite suppression are scrutinized and highlighted. Lastly, the conclusion is drawn and the future outlook for separator engineering is presented.

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Enhanced separator wettability by LiTFSI and its application for lithium metal batteries

Cited by 71 publications

References 24 publications

Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes

Synergistic Effects on Lithium Metal Batteries by Preferential Ionic Interactions in Concentrated Bisalt Electrolytes

Wetting behavior of four polar organic solvents containing one of three lithium salts on a lithium-ion-battery separator

Recent advances in separator engineering for effective dendrite suppression of Li‐metal anodes

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