Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions

The performance of a sodium-ion (Na) battery is significantly influenced by its electrolyte characteristics. In particular, the transport properties of the electrolyte have considerable effects on the discharge rate capability. During discharging of a Na battery at high current densities, a concentr...

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Autores principales:	Ryoichi TATARA, Yukihiro OKAMOTO, Yosuke UGATA, Kazuhide UENO, Masayoshi WATANABE, Kaoru DOKKO
Formato:	article
Lenguaje:	EN JA
Publicado:	The Electrochemical Society of Japan 2021
Materias:	sodium batteries ligand exchange transference number concentration polarization Technology T Physical and theoretical chemistry QD450-801
Acceso en línea:	https://doaj.org/article/d51b12f7085640f3a798ef7c19dc3297
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spelling	oai:doaj.org-article:d51b12f7085640f3a798ef7c19dc32972021-11-05T00:17:27ZHighly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions2186-245110.5796/electrochemistry.21-00095https://doaj.org/article/d51b12f7085640f3a798ef7c19dc32972021-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/electrochemistry/89/6/89_21-00095/_html/-char/enhttps://doaj.org/toc/2186-2451The performance of a sodium-ion (Na) battery is significantly influenced by its electrolyte characteristics. In particular, the transport properties of the electrolyte have considerable effects on the discharge rate capability. During discharging of a Na battery at high current densities, a concentration gradient of Na salt develops because both cations and anions are mobile in the liquid electrolyte. Concentration polarization can be suppressed by increasing the Na+ transference number (tNa+) of the electrolyte. This study demonstrates that highly concentrated NaN(SO2F)2 dissolved in 3-methylsulfolane (MSL) exhibits a high tNa+ value of >0.6 under anion-blocking conditions. Raman spectroscopy revealed that Na+ ions formed complexes with MSL and anions in the electrolyte. Na+ ions exchange ligands dynamically and move faster than the ligands, resulting in a high tNa+. The high tNa+ enables a high-rate discharge of the Na battery, despite the low ionic conductivity of the highly concentrated electrolyte.Ryoichi TATARAYukihiro OKAMOTOYosuke UGATAKazuhide UENOMasayoshi WATANABEKaoru DOKKOThe Electrochemical Society of Japanarticlesodium batteriesligand exchangetransference numberconcentration polarizationTechnologyTPhysical and theoretical chemistryQD450-801ENJAElectrochemistry, Vol 89, Iss 6, Pp 590-596 (2021)
institution	DOAJ
collection	DOAJ
language	EN JA
topic	sodium batteries ligand exchange transference number concentration polarization Technology T Physical and theoretical chemistry QD450-801
spellingShingle	sodium batteries ligand exchange transference number concentration polarization Technology T Physical and theoretical chemistry QD450-801 Ryoichi TATARA Yukihiro OKAMOTO Yosuke UGATA Kazuhide UENO Masayoshi WATANABE Kaoru DOKKO Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
description	The performance of a sodium-ion (Na) battery is significantly influenced by its electrolyte characteristics. In particular, the transport properties of the electrolyte have considerable effects on the discharge rate capability. During discharging of a Na battery at high current densities, a concentration gradient of Na salt develops because both cations and anions are mobile in the liquid electrolyte. Concentration polarization can be suppressed by increasing the Na+ transference number (tNa+) of the electrolyte. This study demonstrates that highly concentrated NaN(SO2F)2 dissolved in 3-methylsulfolane (MSL) exhibits a high tNa+ value of >0.6 under anion-blocking conditions. Raman spectroscopy revealed that Na+ ions formed complexes with MSL and anions in the electrolyte. Na+ ions exchange ligands dynamically and move faster than the ligands, resulting in a high tNa+. The high tNa+ enables a high-rate discharge of the Na battery, despite the low ionic conductivity of the highly concentrated electrolyte.
format	article
author	Ryoichi TATARA Yukihiro OKAMOTO Yosuke UGATA Kazuhide UENO Masayoshi WATANABE Kaoru DOKKO
author_facet	Ryoichi TATARA Yukihiro OKAMOTO Yosuke UGATA Kazuhide UENO Masayoshi WATANABE Kaoru DOKKO
author_sort	Ryoichi TATARA
title	Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
title_short	Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
title_full	Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
title_fullStr	Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
title_full_unstemmed	Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions
title_sort	highly concentrated nan(so2f)2/3-methylsulfolane electrolyte solution showing high na-ion transference number under anion-blocking conditions
publisher	The Electrochemical Society of Japan
publishDate	2021
url	https://doaj.org/article/d51b12f7085640f3a798ef7c19dc3297
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Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions

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