Cargando…

Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions

Room-temperature-fused Li salt solvates that exhibit ionic liquid-like behaviour can be formed using particular combinations of multidentate glymes and lithium salts bearing weakly coordinating anions, and are now deemed a subset of ionic liquids, viz. solvate ionic liquids (SILs). Herein, we report...

Descripción completa

Detalles Bibliográficos
Autores principales: Shigenobu, Keisuke, Nakanishi, Azusa, Ueno, Kazuhide, Dokko, Kaoru, Watanabe, Masayoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9067099/
https://www.ncbi.nlm.nih.gov/pubmed/35519483
http://dx.doi.org/10.1039/c9ra03580j
_version_ 1784699933020913664
author Shigenobu, Keisuke
Nakanishi, Azusa
Ueno, Kazuhide
Dokko, Kaoru
Watanabe, Masayoshi
author_facet Shigenobu, Keisuke
Nakanishi, Azusa
Ueno, Kazuhide
Dokko, Kaoru
Watanabe, Masayoshi
author_sort Shigenobu, Keisuke
collection PubMed
description Room-temperature-fused Li salt solvates that exhibit ionic liquid-like behaviour can be formed using particular combinations of multidentate glymes and lithium salts bearing weakly coordinating anions, and are now deemed a subset of ionic liquids, viz. solvate ionic liquids (SILs). Herein, we report redox-active glyme–Li salt molten solvates consisting of tetraethyleneglycol ethylmethyl ether (G4Et) and lithium iodide/triiodide, [Li(G4Et)]I and [Li(G4Et)]I(3). The coordination structure of the complex ions and the thermal, transport, and electrochemical properties of these molten Li salt solvates were investigated to diagnose whether they can be categorized as SILs. [Li(G4Et)](+) and I(3)(−) were found to remain stable as discrete ions and exist as well-dissociated forms in the liquid state, indicating that [Li(G4Et)]I(3) can be classified as a good SIL. This study also clarified that the I(−) and I(3)(−) counter anions exhibit an electrochemical redox reaction in the highly concentrated molten Li salt solvates. The redox-active molten Li solvates were further studied as a highly concentrated catholyte for use in rechargeable semi-liquid lithium batteries. Although the cell constructed using [Li(G4Et)]I(3) failed to charge after the initial discharge step, the cell containing [Li(G4Et)]I demonstrates reversible charge–discharge behaviour with a high volumetric energy density of 180 W h L(−1) based on the catholyte volume.
format Online
Article
Text
id pubmed-9067099
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher The Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-90670992022-05-04 Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions Shigenobu, Keisuke Nakanishi, Azusa Ueno, Kazuhide Dokko, Kaoru Watanabe, Masayoshi RSC Adv Chemistry Room-temperature-fused Li salt solvates that exhibit ionic liquid-like behaviour can be formed using particular combinations of multidentate glymes and lithium salts bearing weakly coordinating anions, and are now deemed a subset of ionic liquids, viz. solvate ionic liquids (SILs). Herein, we report redox-active glyme–Li salt molten solvates consisting of tetraethyleneglycol ethylmethyl ether (G4Et) and lithium iodide/triiodide, [Li(G4Et)]I and [Li(G4Et)]I(3). The coordination structure of the complex ions and the thermal, transport, and electrochemical properties of these molten Li salt solvates were investigated to diagnose whether they can be categorized as SILs. [Li(G4Et)](+) and I(3)(−) were found to remain stable as discrete ions and exist as well-dissociated forms in the liquid state, indicating that [Li(G4Et)]I(3) can be classified as a good SIL. This study also clarified that the I(−) and I(3)(−) counter anions exhibit an electrochemical redox reaction in the highly concentrated molten Li salt solvates. The redox-active molten Li solvates were further studied as a highly concentrated catholyte for use in rechargeable semi-liquid lithium batteries. Although the cell constructed using [Li(G4Et)]I(3) failed to charge after the initial discharge step, the cell containing [Li(G4Et)]I demonstrates reversible charge–discharge behaviour with a high volumetric energy density of 180 W h L(−1) based on the catholyte volume. The Royal Society of Chemistry 2019-07-23 /pmc/articles/PMC9067099/ /pubmed/35519483 http://dx.doi.org/10.1039/c9ra03580j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Shigenobu, Keisuke
Nakanishi, Azusa
Ueno, Kazuhide
Dokko, Kaoru
Watanabe, Masayoshi
Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title_full Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title_fullStr Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title_full_unstemmed Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title_short Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions
title_sort glyme–li salt equimolar molten solvates with iodide/triiodide redox anions
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9067099/
https://www.ncbi.nlm.nih.gov/pubmed/35519483
http://dx.doi.org/10.1039/c9ra03580j
work_keys_str_mv AT shigenobukeisuke glymelisaltequimolarmoltensolvateswithiodidetriiodideredoxanions
AT nakanishiazusa glymelisaltequimolarmoltensolvateswithiodidetriiodideredoxanions
AT uenokazuhide glymelisaltequimolarmoltensolvateswithiodidetriiodideredoxanions
AT dokkokaoru glymelisaltequimolarmoltensolvateswithiodidetriiodideredoxanions
AT watanabemasayoshi glymelisaltequimolarmoltensolvateswithiodidetriiodideredoxanions