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Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries
Solvate ionic liquids (SILs), comprising long-lived, Li solvate cations and counter anions, serve as highly Li-ion-conductive and non-flammable electrolytes for use in lithium secondary batteries. In this work, we synthesized a series of novel redox-active glyme(oligoether)–Li salt-based SILs, consi...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9048989/ https://www.ncbi.nlm.nih.gov/pubmed/35492641 http://dx.doi.org/10.1039/c9ra10149g |
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author | Kemmizaki, Yuta Katayama, Yu Tsutsumi, Hiromori Ueno, Kazuhide |
author_facet | Kemmizaki, Yuta Katayama, Yu Tsutsumi, Hiromori Ueno, Kazuhide |
author_sort | Kemmizaki, Yuta |
collection | PubMed |
description | Solvate ionic liquids (SILs), comprising long-lived, Li solvate cations and counter anions, serve as highly Li-ion-conductive and non-flammable electrolytes for use in lithium secondary batteries. In this work, we synthesized a series of novel redox-active glyme(oligoether)–Li salt-based SILs, consisting of a symmetric ([Li(G3)](+)) or asymmetric ([Li(G3Bu)](+)) triglyme–Li salt complex and redox-active tetrahalogenoferrate ([FeX](−) (X = Br(4), Cl(3)Br, Cl(4))), for use as the catholyte in semi-liquid lithium secondary batteries. The successful formation of stable molten complexes of [Li(G3/G3Bu)][FeX] was confirmed by Raman spectroscopy and thermogravimetry. The melting point (T(m)) depended on both the molecular weights of the complex anions and the structures of the complex cations. [Li(G3)][FeCl(4)] comprised complex cations with a symmetric structure, and the smallest complex anions showed the lowest T(m) of 28.2 °C. The redox properties of the [FeX](−)/[FeX](2−) couple strongly suggested the suitability of [Li(G3/G3Bu)][FeX] as a catholyte. The discharge capacities of semi-liquid lithium secondary batteries utilizing the [Li(G3/G3Bu)][FeX] catholyte depended on the structure of the SILs, and the cell with [Li(G3)][FeCl(4)] showed the highest capacity with relatively good capacity retention. This study confirmed the feasibility of the glyme-based redox-active SILs as catholytes for scalable redox-flow type batteries. |
format | Online Article Text |
id | pubmed-9048989 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90489892022-04-28 Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries Kemmizaki, Yuta Katayama, Yu Tsutsumi, Hiromori Ueno, Kazuhide RSC Adv Chemistry Solvate ionic liquids (SILs), comprising long-lived, Li solvate cations and counter anions, serve as highly Li-ion-conductive and non-flammable electrolytes for use in lithium secondary batteries. In this work, we synthesized a series of novel redox-active glyme(oligoether)–Li salt-based SILs, consisting of a symmetric ([Li(G3)](+)) or asymmetric ([Li(G3Bu)](+)) triglyme–Li salt complex and redox-active tetrahalogenoferrate ([FeX](−) (X = Br(4), Cl(3)Br, Cl(4))), for use as the catholyte in semi-liquid lithium secondary batteries. The successful formation of stable molten complexes of [Li(G3/G3Bu)][FeX] was confirmed by Raman spectroscopy and thermogravimetry. The melting point (T(m)) depended on both the molecular weights of the complex anions and the structures of the complex cations. [Li(G3)][FeCl(4)] comprised complex cations with a symmetric structure, and the smallest complex anions showed the lowest T(m) of 28.2 °C. The redox properties of the [FeX](−)/[FeX](2−) couple strongly suggested the suitability of [Li(G3/G3Bu)][FeX] as a catholyte. The discharge capacities of semi-liquid lithium secondary batteries utilizing the [Li(G3/G3Bu)][FeX] catholyte depended on the structure of the SILs, and the cell with [Li(G3)][FeCl(4)] showed the highest capacity with relatively good capacity retention. This study confirmed the feasibility of the glyme-based redox-active SILs as catholytes for scalable redox-flow type batteries. The Royal Society of Chemistry 2020-01-24 /pmc/articles/PMC9048989/ /pubmed/35492641 http://dx.doi.org/10.1039/c9ra10149g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Kemmizaki, Yuta Katayama, Yu Tsutsumi, Hiromori Ueno, Kazuhide Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title | Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title_full | Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title_fullStr | Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title_full_unstemmed | Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title_short | Redox-active glyme–Li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
title_sort | redox-active glyme–li tetrahalogenoferrate(iii) solvate ionic liquids for semi-liquid lithium secondary batteries |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9048989/ https://www.ncbi.nlm.nih.gov/pubmed/35492641 http://dx.doi.org/10.1039/c9ra10149g |
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