Protecting Li Metal Anode While Suppressing “Shuttle Effect” of Li-S Battery Through Localized High-Concentration Electrolyte

Hou, Zhenpeng; Wang, Peng-Fei; Sun, Xiance; Li, Wei; Sheng, Chuanchao; He, Ping

doi:10.1007/s11664-022-09751-z

Cited by 7 publications

(3 citation statements)

References 40 publications

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“…These fluorine species are regarded as effective components of the SEI layer that prevent electrolyte decomposition during cycling. [61][62][63] Here, it is important to note that the fluorine species most likely originated from the decomposition of TFSI anions in the electrolyte, indicating that the TFSI anions may participate in the formation of SEI layers by an electrochemical reaction at the Li anode, even though the decomposition of TFSI has not been well recognized. This indicated that DEE may accelerate the electrochemical reaction of TFSI upon cycling at the Li anode.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the DEE‐based electrolyte had a higher proportion of fluorine species, such as fluorocarbons (687.9 eV: 1.9% and 689.8 eV: 4.2%) 58,59 and lithium fluoride (685.4 eV: 6.0%), 60 than the DOL‐based electrolyte alone (0.5%, 0.2%, and 2.3%, respectively). These fluorine species are regarded as effective components of the SEI layer that prevent electrolyte decomposition during cycling 61–63 . Here, it is important to note that the fluorine species most likely originated from the decomposition of TFSI anions in the electrolyte, indicating that the TFSI anions may participate in the formation of SEI layers by an electrochemical reaction at the Li anode, even though the decomposition of TFSI has not been well recognized.…”

Section: Resultsmentioning

confidence: 99%

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1,1‐Diethoxyethane as an interfacial‐stabilizing solvent for lithium–sulfur batteries

Park,

Kim,

Yim

2023

Bulletin Korean Chem Soc

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Lithium–sulfur batteries (LSBs) have gained remarkable attention over the past several years, however, their inherent limitations, such as the poor interfacial stability of their Li anodes and the severe dissolution of polysulfide, are regarded as bottlenecks that prevent these batteries from entering commercial markets. In this study, a 1,1‐diethoxyethane (DEE), which has been functionalized with acetal groups, is proposed as an electrolyte cosolvent to complement the limitations of the electrode materials of LSBs. In Li/Li symmetric cells, the DEE cosolvent exhibited stable cycling behavior, whereas the cell with the baseline electrolyte exhibited rapidly increasing polarization, even after 650 h. In LSB cells, the electrolyte that contains 50% DEE exhibits the highest cycling retention (65.0%) compared to the baseline electrolyte (49.8%) because it effectively protects the interface of the Li anode, but also suppresses the dissolution of polysulfide species.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

1,1‐Diethoxyethane as an interfacial‐stabilizing solvent for lithium–sulfur batteries

Park,

Kim,

Yim

2023

Bulletin Korean Chem Soc

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“…); − (iii) compositing Li metal anodes with various 3D current collectors, − including carbon-based frameworks, such as carbon fiber, graphene sheets, and carbon nanotube (CNT) paper, etc., as well as metal-based substrates, such as Ni foam, Cu foam, porous Cu, etc. ; (iv) designing functional electrolytes, − such as using functional Li salts or cosolvent, to improve the concentration of Li salts (high-concentration or local high-concentration electrolyte); (v) using alloyed Li metal or mixed Li metal anodes, − e.g., Li-Sn, Li-Si alloys, or Li x Si-C composite anodes; (vi) using a stabilized Li powder, − typically Li metal powder produced by FMC Co. (Figure ). All of these strategies have made Li metal anodes a research hotspot, triggering great innovations in many fields, including materials engineering, interface chemistry, solution chemistry, catalysis, etc.…”

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confidence: 99%

Air-Stable Lithium Metal Anodes: A Perspective of Surface Engineering from Different Dimensions

Wang,

Ren,

et al. 2023

ACS Energy Lett.

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Figure 14. Preparing air-stable Li electrode based on 3D Li host. (a) Schematic illustration of the hierarchically structured rAGA-Li. Reproduced with permission from ref 143. Copyright 2020 Wiley-VCH. (b) Voltage−time profiles of symmetrical cells using the two airtreated samples at current densities of 1 mA cm −2 with stripping/plating capacity of 1 mAh cm −2 . Reproduced with permission from ref 143. Copyright 2020 Wiley-VCH. (c) Schematic illustration of fabrication of Li-KNiF 3 electrode. Reproduced with permission from ref 187. Copyright 2022 Elsevier. (d) Optical photographs of bare Li and Li-KNiF 3 after exposure to ambient air with ∼50% RH for various times. Reproduced with permission from ref 187.

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Tuning the FEC‐Related Electrolyte Solvation Structures in Ether Solvents Enables High‐Performance Lithium Metal Anode

Zhang,

Li,

Cao

et al. 2024

Adv Funct Materials

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Lithium metal is the most promising high‐energy‐density anode. However, it is incompatible with high‐voltage cathodes in ether solvents due to their narrow electrochemical window. Herein, fluoroethylene carbonate (FEC) co‐solvent is introduced to regulate the Li+ solvation structures in ether solvents, including cyclic ether (1,3‐dioxolane [DOL]) and linear glymes with different chain lengths (1,2‐dimethoxyethane [DME], diglyme [G2] and triglyme [G3]). The apparently different effects of ether solvents on solvation ability and interaction strength with FEC are revealed. FEC plays a diverse role and function in 1 m lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)‐ether/FEC electrolyte, thus relevant batteries perform distinct performances due to various ionic dynamics and solid‐electrolyte interphase. The Li+‐solvation structures are explored by Raman and nuclear magnetic resonance spectroscopies. Specifically, part of FEC molecules are inserted into the first solvation shell in 1 m LiTFSI‐DOL/FEC because of the weak solvation ability of DOL and strong interaction of DOL‐FEC, leading to few coordinated TFSI− and sluggish interfacial kinetics. In sharp contrast, FEC as a weak coordinated solvent almost exclusively occupies the second solvation sheath in 1 m LiTFSI‐glyme/FEC, favoring TFSI− coordination and rapid de‐solvation dynamics. Ultimately, the LiNi0.8Co0.1Mn0.1O2/Li battery in G2/FEC presents the most excellent performance, derived from abundant free‐FEC and rapid ionic kinetics.

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Protecting Li Metal Anode While Suppressing “Shuttle Effect” of Li-S Battery Through Localized High-Concentration Electrolyte

Cited by 7 publications

References 40 publications

1,1‐Diethoxyethane as an interfacial‐stabilizing solvent for lithium–sulfur batteries

1,1‐Diethoxyethane as an interfacial‐stabilizing solvent for lithium–sulfur batteries

Air-Stable Lithium Metal Anodes: A Perspective of Surface Engineering from Different Dimensions

Tuning the FEC‐Related Electrolyte Solvation Structures in Ether Solvents Enables High‐Performance Lithium Metal Anode

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