Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)

An electrical conductivity and its activation energy are measured for solid-liquid coexistence systems consisting of TiO2 powder/highly concentrated LiTFSA aqueous electrolyte (20.5 mol kg−1). The conductivity increases exponentially with an increase of the liquid content up to ca. 40 vol%, and the...

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Main Authors: Jingchao XU, Hideshi MAKI, Hiro MINAMIMOTO, Minoru MIZUHATA
Format: Article
Language:English
Published: The Electrochemical Society of Japan 2025-01-01
Series:Electrochemistry
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Online Access:https://www.jstage.jst.go.jp/article/electrochemistry/93/1/93_24-00115/_html/-char/en
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author Jingchao XU
Hideshi MAKI
Hiro MINAMIMOTO
Minoru MIZUHATA
author_facet Jingchao XU
Hideshi MAKI
Hiro MINAMIMOTO
Minoru MIZUHATA
author_sort Jingchao XU
collection DOAJ
description An electrical conductivity and its activation energy are measured for solid-liquid coexistence systems consisting of TiO2 powder/highly concentrated LiTFSA aqueous electrolyte (20.5 mol kg−1). The conductivity increases exponentially with an increase of the liquid content up to ca. 40 vol%, and the activation energy of the conductivity increases with a decrease of the liquid content below 35 vol%. Various spectroscopic measurement, such as Raman, near-infrared (NIR), and NMR spectra indicated that the presence of TiO2 disrupts the nanoscale water channel structure in the water-enriched regions of the bulk solution in the TiO2 powder/20.5 mol kg−1 LiTFSA solid-liquid coexistence system with a liquid phase volume fraction below 40 vol%, resulting in an unusual decrease in the electrical conductivity. The strong influence of the solid phase on the electrical conduction of the highly concentrated LiTFSA electrolyte was found to be significant only in the region below 50 vol% in the liquid content, while in the region of the liquid content above 50 vol%, there were no differences due to electrolyte concentration and ion species, indicating the influence of the solid phase on electrical conduction.
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institution Kabale University
issn 2186-2451
language English
publishDate 2025-01-01
publisher The Electrochemical Society of Japan
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series Electrochemistry
spelling doaj-art-458f022224ac470193c4ad0a16174d652025-01-23T01:11:02ZengThe Electrochemical Society of JapanElectrochemistry2186-24512025-01-0193101700301700310.5796/electrochemistry.24-00115electrochemistryEffect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)Jingchao XU0https://orcid.org/0009-0007-3697-0497Hideshi MAKI1https://orcid.org/0000-0002-8960-4833Hiro MINAMIMOTO2https://orcid.org/0000-0002-2360-577XMinoru MIZUHATA3https://orcid.org/0000-0002-4496-2215Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe UniversityDepartment of Chemical Science and Engineering, Graduate School of Engineering, Kobe UniversityDepartment of Chemical Science and Engineering, Graduate School of Engineering, Kobe UniversityDepartment of Chemical Science and Engineering, Graduate School of Engineering, Kobe UniversityAn electrical conductivity and its activation energy are measured for solid-liquid coexistence systems consisting of TiO2 powder/highly concentrated LiTFSA aqueous electrolyte (20.5 mol kg−1). The conductivity increases exponentially with an increase of the liquid content up to ca. 40 vol%, and the activation energy of the conductivity increases with a decrease of the liquid content below 35 vol%. Various spectroscopic measurement, such as Raman, near-infrared (NIR), and NMR spectra indicated that the presence of TiO2 disrupts the nanoscale water channel structure in the water-enriched regions of the bulk solution in the TiO2 powder/20.5 mol kg−1 LiTFSA solid-liquid coexistence system with a liquid phase volume fraction below 40 vol%, resulting in an unusual decrease in the electrical conductivity. The strong influence of the solid phase on the electrical conduction of the highly concentrated LiTFSA electrolyte was found to be significant only in the region below 50 vol% in the liquid content, while in the region of the liquid content above 50 vol%, there were no differences due to electrolyte concentration and ion species, indicating the influence of the solid phase on electrical conduction.https://www.jstage.jst.go.jp/article/electrochemistry/93/1/93_24-00115/_html/-char/enhighly concentrated litfsa electrolytesolid/liquid interfaceionic conductivity
spellingShingle Jingchao XU
Hideshi MAKI
Hiro MINAMIMOTO
Minoru MIZUHATA
Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
Electrochemistry
highly concentrated litfsa electrolyte
solid/liquid interface
ionic conductivity
title Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
title_full Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
title_fullStr Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
title_full_unstemmed Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
title_short Effect of Coexisting TiO2 Powder on Ionic Conduction of Highly Concentrated LiTFSA Aqueous Electrolyte (20.5 mol kg−1)
title_sort effect of coexisting tio2 powder on ionic conduction of highly concentrated litfsa aqueous electrolyte 20 5 mol kg 1
topic highly concentrated litfsa electrolyte
solid/liquid interface
ionic conductivity
url https://www.jstage.jst.go.jp/article/electrochemistry/93/1/93_24-00115/_html/-char/en
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AT hideshimaki effectofcoexistingtio2powderonionicconductionofhighlyconcentratedlitfsaaqueouselectrolyte205molkg1
AT hirominamimoto effectofcoexistingtio2powderonionicconductionofhighlyconcentratedlitfsaaqueouselectrolyte205molkg1
AT minorumizuhata effectofcoexistingtio2powderonionicconductionofhighlyconcentratedlitfsaaqueouselectrolyte205molkg1