KFU. Card publication. Structural and Ion Dynamics in Fluorine-Free Oligoether Carboxylate Ionic Liquid-Based Electrolytes

KAZAN
FEDERAL UNIVERSITY

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STRUCTURAL AND ION DYNAMICS IN FLUORINE-FREE OLIGOETHER CARBOXYLATE IONIC LIQUID-BASED ELECTROLYTES

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Gnezdilov Oleg Ivanovich, author

Filippov Andrey Vasilevich, author

Bibliographic description in the original language

Shah F.U, Gnezdilov O.I, Khan I.A, Structural and Ion Dynamics in Fluorine-Free Oligoether Carboxylate Ionic Liquid-Based Electrolytes//Journal of Physical Chemistry B. - 2020. - Vol. 124., P.- 9670-9700

Annotation

we investigate the physicochemical and electrochemical properties of fluorine-free ionic liquid (IL)-based electrolytes with two different cations, tetrabutylphosphonium, (P4,4,4,4)+, and tetrabutylammonium, (N4,4,4,4)+, coupled to a new anion, 2-[2-(2-methoxyethoxy)ethoxy]acetate anion (MEEA)−, for both neat and (P4,4,4,4)(MEEA) also doped with 10−40 mol % of Li(MEEA). We find relatively weaker cation−anion interactions in (P4,4,4,4)(MEEA) than in (N4,4,4,4)(MEEA), and for both ILs, the structural flexibility of the oligoether functionality in the anion results in low glass transition temperatures, also for the electrolytes made. The pulsed field gradient nuclear magnetic resonance (PFG NMR) data suggest faster diffusion of the (MEEA)− anion than (P4,4,4,4)+ cation in the neat IL, but the addition of a Li salt results in slightly lower mobility of the former than the latter and lower ionic conductivity. This agrees with the combined 7Li NMR and attenuated total reflection−Fourier transform infrared (ATR−FTIR) spectroscopy data, which unambiguously reveal preferential interactions between the lithium cations and the carboxylate groups of the IL anions, which also increased as a function of the lithium salt concentration. In total, these systems provide a stepping stone for further design of fluorine-free and low glass transition temperature IL-based electrolytes and also stress how crucial it is to control the strength of ion−ion interactions.

Keywords

fluorine-free ionic liquids, electrolytes, pulsed field gradient nuclear magnetic resonance, conductivity, diffusion, cation−anion interactions

The name of the journal

Journal of Physical Chemistry B

URL

https://dx.doi.org/10.1021/acs.jpcb.0c04749facs.jpcb.0c04749&partnerID=40&md5=6c7fa77a2cf970afaa0b3e5cb4590087

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=242049&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Gnezdilov Oleg Ivanovich	ru_RU
dc.contributor.author	Filippov Andrey Vasilevich	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Shah F.U, Gnezdilov O.I, Khan I.A, Structural and Ion Dynamics in Fluorine-Free Oligoether Carboxylate Ionic Liquid-Based Electrolytes//Journal of Physical Chemistry B. - 2020. - Vol. 124., P.- 9670-9700	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=242049&p_lang=2	ru_RU
dc.description.abstract	Journal of Physical Chemistry B	ru_RU
dc.description.abstract	we investigate the physicochemical and electrochemical properties of fluorine-free ionic liquid (IL)-based electrolytes with two different cations, tetrabutylphosphonium, (P4,4,4,4)+, and tetrabutylammonium, (N4,4,4,4)+, coupled to a new anion, 2-[2-(2-methoxyethoxy)ethoxy]acetate anion (MEEA)−, for both neat and (P4,4,4,4)(MEEA) also doped with 10−40 mol % of Li(MEEA). We find relatively weaker cation−anion interactions in (P4,4,4,4)(MEEA) than in (N4,4,4,4)(MEEA), and for both ILs, the structural flexibility of the oligoether functionality in the anion results in low glass transition temperatures, also for the electrolytes made. The pulsed field gradient nuclear magnetic resonance (PFG NMR) data suggest faster diffusion of the (MEEA)− anion than (P4,4,4,4)+ cation in the neat IL, but the addition of a Li salt results in slightly lower mobility of the former than the latter and lower ionic conductivity. This agrees with the combined 7Li NMR and attenuated total reflection−Fourier transform infrared (ATR−FTIR) spectroscopy data, which unambiguously reveal preferential interactions between the lithium cations and the carboxylate groups of the IL anions, which also increased as a function of the lithium salt concentration. In total, these systems provide a stepping stone for further design of fluorine-free and low glass transition temperature IL-based electrolytes and also stress how crucial it is to control the strength of ion−ion interactions.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	fluorine-free ionic liquids	ru_RU
dc.subject	electrolytes	ru_RU
dc.subject	pulsed field gradient nuclear magnetic resonance	ru_RU
dc.subject	conductivity	ru_RU
dc.subject	diffusion	ru_RU
dc.subject	cation−anion interactions	ru_RU
dc.title	Structural and Ion Dynamics in Fluorine-Free Oligoether Carboxylate Ionic Liquid-Based Electrolytes	ru_RU
dc.type	Articles in international journals and collections	ru_RU