Nitrile functionalized silyl ether with dissolved LiTFSI as new electrolyte solvent for lithium-ion batteries

Pohl, Benjamin; Grünebaum, Mariano; Drews, Mathias; Passerini, Stefano; Winter, Martin; Wiemhöfer, Hans‐Dieter

doi:10.1016/j.electacta.2015.09.001

Cited by 19 publications

(13 citation statements)

References 39 publications

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“…In addition, we suggest that the presence of fluorine throughout the SEI may indicate that some of the FEC reduction products encapsulate residual lithium anion salt (TFSI). This unique encapsulation property can explain how siloxane‐based solvents hinder aluminium pitting as was reported by Pohl et al ,…”

Section: Resultssupporting

confidence: 55%

“…The incorporation of siloxane‐, and silane‐ based low viscosity solvents as electrolytes in lithium‐ion batteries can circumvent some of the abovementioned drawbacks, namely chemical stability, relatively high volatility and temperature endurance, while exhibiting a wide potential window. Here, we report the results obtained from characterizations of SEI formed on silicon nanostructures in disiloxane‐based 1,3‐bis(cyanopropyl)tetramethyldisiloxane, a disiloxane with nitrile end groups (TmdSx‐CN, refer to Scheme ) and compare it to an SEI formed with a fluorocarbon additive ubiquitous to silicon anode based batteries .…”

Section: Introductionmentioning

confidence: 99%

“…Here, we report the results obtained from characterizations of SEI formed on silicon nanostructures in disiloxane-based 1,3-bis(cyanopropyl)tetramethyldisiloxane, a disiloxane with nitrile end groups (TmdSx-CN, refer to Scheme 1) and compare it to an SEI formed with a fluorocarbon additive ubiquitous to silicon anode based batteries. [18] We emphasize the critical role of fluoroethylene carbonate (FEC) addition in producing an effective SEI enabling cycling stability and faster C-rate.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Formation of a Solid Electrolyte Interphase (SEI) on a Silicon Nanowire Anode in Liquid Disiloxane Electrolyte with Nitrile End Groups for Lithium‐Ion Batteries

Horowitz

Ben‐Barak

Schneier

et al. 2019

Batteries & Supercaps

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The chemical compatibility of the various compounds and elements used in lithium‐based batteries dictates their safe operation parameters and performance. The lithium salt Li‐bis(trifluoromethanesulfonyl)imide (LiTFSI) has many advantages over the common LiPF6 salt as it does not react with water impurities to form, for example, hydrofluoric acid. To further accommodate safe‐operation chemistry, we use a non‐volatile disiloxane‐based solvent 1,3‐bis(cyanopropyl)tetramethyldisiloxane (TmdSx‐CN). This is a liquid disiloxane functionalized with terminal nitrile groups. In this paper, we report on the electrochemical characterization and the composition of the solid electrolyte interphase (SEI) of 1 mol kg−1 LiTFSI dissolved in TmdSx‐CN in silicon‐lithium batteries. Specifically, we study the SEI formation on silicon nanowire anodes and its composition by several ex‐situ surface techniques (XPS, SEM), and in‐situ via polarization modulation infrared reflectance absorption spectroscopy (PM‐IRRAS). We evaluate the potential application of TmdSx‐CN to silicon‐lithium batteries and conclude that the addition of fluoroethylene carbonate (FEC) at low concentrations (10 wt %) is essential to the formation of an effective SEI. We anticipate that our study will encourage the investigation, design and use of siloxane‐based solvents as safer alternatives to common solvents used in Li‐ion batteries, and specifically as candidate solvents in Li‐metal and silicon‐anode based batteries.

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the Formation of a Solid Electrolyte Interphase (SEI) on a Silicon Nanowire Anode in Liquid Disiloxane Electrolyte with Nitrile End Groups for Lithium‐Ion Batteries

Horowitz

Ben‐Barak

Schneier

et al. 2019

Batteries & Supercaps

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“…[66] The joint anion could improve the electrochemical performance of LiTFSI in ILs, [66][67][68][69] though at the cost of sacrificing both conductivity and viscosity. [71][72][73] A key advantageous feature of LiTFSI as highlighted from the early works is its high solubility. [70] Alternatively, LiTFSI, as an emerging lithium salt, was examined in various solvents.…”

Section: Operating Potential Windowmentioning

confidence: 99%

“…[71][72][73] A key advantageous feature of LiTFSI as highlighted from the early works is its high solubility. [73,[76][77][78][79] In the same line of research, the possibility of utilizing LiTFSI in aqueous electrolytes was investigated. [74] This is the same molten salt introduced by Armand and co-workers, [66,70] but the "IL-in-salt" relied upon the idea of superconcentrated LiTFSI.…”

Section: Operating Potential Windowmentioning

confidence: 99%

High‐Energy Aqueous Lithium Batteries

Eftekhari¹

2018

Advanced Energy Materials

157

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research, aqueous electrolytes were occasionally employed for the investigation of cathode materials instead of the conventional nonaqueous electrolytes. [9,10] It was discussed that the simplicity of an aqueous electrolyte provides a better opportunity for the fundamental studies of the process of intercalation/deintercalation of Li-ions as opposed to the nonaqueous electrolytes. For instance, although the formation of solid electrolyte interphase (SEI) is of utmost importance for the cyclability of LIB, the significant role of the electrolyte does not allow to exclusively study the electrochemical behavior of the electrode material under consideration. The current research has specifically targeted the development of ARLBs, but in practice, most of the recent papers have followed the same line of research in investigating a limited range of cathode and anode materials in the same aqueous electrolytes. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] A possible reason is that the key advantage of ARLBs was low cost, and thus, the focus was limited to a few inexpensive materials (e.g., lithium salts). Aqueous electrolytes are definitely excellent choices for the fundamental studies of electrode materials, but the practical development of ARLBs needs overcoming the key obstacles rather than finding more cathode materials.In any case, aqueous electrolytes were occasionally used during the 2000s by various research groups, but there was no vivid plan for the development of ARLBs. These works have been extensively reviewed before, [29][30][31][32][33] and it is not aimed to repeat the general works on aqueous electrolytes here. During the recent years, new opportunities have been introduced, which can extend the stable potential window of aqueous electrolyte to the range of 3-4 V. Upon this advancement, aqueous electrolytes can fairly compete with the conventional nonaqueous electrolytes for the fabrication of cheaper and safer LIBs. On the other hand, novel designs such as self-healing [34] or flexible [16,35,36] ARLBs have paved the path for new practical potentials of aqueous electrolytes. The present paper specifically focuses on the recent advancements and attempts to foster the strategy of research to shed light on the pathway of this emerging area of research. Two factors are directly responsible for achieving a high energy density, the specific capacity, and the cell voltage. Since the former is not massively controlled by the electrolyte and the specific capacity of most electroactive Owing to the high voltage of lithium-ion batteries (LIBs), the dominating electrolyte is non-aqueous. The idea of an aqueous rechargeable lithium battery (ARLB) dates back to 1994, but it had attracted little attention due to the narrow stable potential window of aqueous electrolytes, which results in low energy density. However, aqueous electrolytes were employed during the 2000s for the fundamental studies of electrode materials in the absence of side reactions such as the decomposition of organic spec...

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Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

Wang

Chen

et al. 2021

Advanced Energy Materials

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Nowadays excessive consumption of fossil fuels due to population growth and industrial development induced serious energy and environmental crisis. To alleviate the ecological crisis and comply with the ever-increasing energy demand, developingThe electrolyte has been considered as a key factor toward higher energy density for Li-ion and Li-metal batteries. However, conventional electrolytes suffer from uncontrolled interfacial reactions and irreversible decomposition causing performance deterioration and potential safety hazard. Organosilicon compounds have attracted great interest as promising electrolyte components due to facile chemical modifications, low glass transition temperatures (T g ), superior chemical, and thermal stabilities. Considerable investigation efforts have been devoted to developing better overall performance of organosilicon-based electrolytes in the past few years. Herein, the recent research progress of organosilicon-based functional electrolytes for the development of liquid, gel, and solid state electrolytes in Li-ion and Li-metal batteries is summarized. Attention is devoted to various types of organosilicon such as silane, siloxane, polysiloxane, and polyhedral oligomeric silsesquioxanes in terms of molecular design, ionic conductivity, functions shown in batteries, thermal, chemical, electrochemical stability, safety, etc. The feasible strategies are also discussed that may promote the comprehensive electrochemical performances of organosilicon-based electrolytes in different types of electrolytes and batteries. Finally, the challenges facing organosilicon-based electrolytes and proposed their possible solutions are presented alongside promising development directions.

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Nitrile functionalized silyl ether with dissolved LiTFSI as new electrolyte solvent for lithium-ion batteries

Cited by 19 publications

References 39 publications

Study of the Formation of a Solid Electrolyte Interphase (SEI) on a Silicon Nanowire Anode in Liquid Disiloxane Electrolyte with Nitrile End Groups for Lithium‐Ion Batteries

Study of the Formation of a Solid Electrolyte Interphase (SEI) on a Silicon Nanowire Anode in Liquid Disiloxane Electrolyte with Nitrile End Groups for Lithium‐Ion Batteries

High‐Energy Aqueous Lithium Batteries

Organosilicon‐Based Functional Electrolytes for High‐Performance Lithium Batteries

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