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Electroreflning reaction of sodium in sodium-bis(trifluoremethylsulfonyl)imide and tetraethylammonium-bis(trifluoremethylsulfonyl)imide mixture ionic liquid

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Title: Electroreflning reaction of sodium in sodium-bis(trifluoremethylsulfonyl)imide and tetraethylammonium-bis(trifluoremethylsulfonyl)imide mixture ionic liquid
Authors: Ueda, Mikito Browse this author →KAKEN DB
Honda, Kazuya Browse this author
Ohtsuka, Toshiaki Browse this author →KAKEN DB
Keywords: Sodium-sulfur secondary battery
Electrorefining of sodium
Ionic liquid
Recycling of metallic sodium
Issue Date: 30-Jun-2013
Publisher: Elsevier
Journal Title: Electrochimica Acta
Volume: 100
Start Page: 265
End Page: 268
Publisher DOI: 10.1016/j.electacta.2012.10.097
Abstract: To develop a electrorefining process of sodium for the recycling of used sodium-sulfur secondary battery, a non-aqueous electrolytic melt was investigated as a candidate for the process. A mixed ionic liquid of NaTFSI (sodium-bis(trifluoremethylsulfonyl)imide)-TEATFSI (tetraethylammonium-bis(trifluoremethylsulfonyl)imide) was selected for the electrolyte, since it has a wide potential window and a weak reactivity with metallic sodium. From AC impedance measurements, the maximum electric conductivity of 36 mS cm(-1) was found for a concentration of 20 mol% NaTFSI-TEATFSI at 433 K. The cathodic deposition of liquid sodium, 99.99% pure, was obtained on a glassy carbon electrode by constant current electrolysis. The calcium concentration in the sodium was decreased from 500 to 12 ppm by the electrorefining. A cathodic current efficiency at 88% was achieved in these electrorefining experiments. (C) 2012 Elsevier Ltd. All rights reserved.
Type: article (author version)
URI: http://hdl.handle.net/2115/53248
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上田 幹人

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