Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode

The present paper provides a new perspective regarding the influence of anions on the rate of lithium ion insertion into graphite. We compared the properties of a LiFSA and solvent system with those of LiPF6 system containing the same solvent when the ionic conductivity of these systems is comparabl...

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Main Authors:	Satoshi Uchida, Tomohide Katada, Masashi Ishikawa
Format:	Article
Language:	English
Published:	Elsevier 2020-05-01
Series:	Electrochemistry Communications
Online Access:	http://www.sciencedirect.com/science/article/pii/S1388248120300564

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spelling	doaj-869fbb588bbc498599b6bf87e31096762020-11-25T02:01:45ZengElsevierElectrochemistry Communications1388-24812020-05-01114Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrodeSatoshi Uchida0Tomohide Katada1Masashi Ishikawa2Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, 1-8-31 midorigaoka, Ikeda, Japan; Corresponding author.Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 yamate-cho, Suita, JapanDepartment of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 yamate-cho, Suita, JapanThe present paper provides a new perspective regarding the influence of anions on the rate of lithium ion insertion into graphite. We compared the properties of a LiFSA and solvent system with those of LiPF6 system containing the same solvent when the ionic conductivity of these systems is comparable, to elucidate that better rate properties of the former system than the latter is well reflected in the lower desolvation resistance (Rdesolv) and its lower activation energy (Eadesolv) of the former. The solvation circumstances around Li+ are similar for both the LiFSA and LiPF6 systems, while a significant interaction between Li+ and an anion is observed only in the former. In addition to the previously proposed hypothesis that the Eadesolv reflects the energy required to desolvate Li+ from the last solvating molecule, the present result points to the necessity of considering the influence of the counter anion. Keywords: Lithium-ion intercalation kinetics, Desolvation process, Coordination state, Graphite electrode/electrolyte interfacehttp://www.sciencedirect.com/science/article/pii/S1388248120300564
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Satoshi Uchida Tomohide Katada Masashi Ishikawa
spellingShingle	Satoshi Uchida Tomohide Katada Masashi Ishikawa Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode Electrochemistry Communications
author_facet	Satoshi Uchida Tomohide Katada Masashi Ishikawa
author_sort	Satoshi Uchida
title	Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
title_short	Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
title_full	Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
title_fullStr	Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
title_full_unstemmed	Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
title_sort	impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode
publisher	Elsevier
series	Electrochemistry Communications
issn	1388-2481
publishDate	2020-05-01
description	The present paper provides a new perspective regarding the influence of anions on the rate of lithium ion insertion into graphite. We compared the properties of a LiFSA and solvent system with those of LiPF6 system containing the same solvent when the ionic conductivity of these systems is comparable, to elucidate that better rate properties of the former system than the latter is well reflected in the lower desolvation resistance (Rdesolv) and its lower activation energy (Eadesolv) of the former. The solvation circumstances around Li+ are similar for both the LiFSA and LiPF6 systems, while a significant interaction between Li+ and an anion is observed only in the former. In addition to the previously proposed hypothesis that the Eadesolv reflects the energy required to desolvate Li+ from the last solvating molecule, the present result points to the necessity of considering the influence of the counter anion. Keywords: Lithium-ion intercalation kinetics, Desolvation process, Coordination state, Graphite electrode/electrolyte interface
url	http://www.sciencedirect.com/science/article/pii/S1388248120300564
work_keys_str_mv	AT satoshiuchida impactoflithiumioncoordinationincarbonatebasedelectrolyteonlithiumionintercalationkineticsintographiteelectrode AT tomohidekatada impactoflithiumioncoordinationincarbonatebasedelectrolyteonlithiumionintercalationkineticsintographiteelectrode AT masashiishikawa impactoflithiumioncoordinationincarbonatebasedelectrolyteonlithiumionintercalationkineticsintographiteelectrode
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Impact of lithium-ion coordination in carbonate-based electrolyte on lithium-ion intercalation kinetics into graphite electrode

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