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