2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 18 Intl. Symp on Advanced Materials, Polymers, Composite, Nanomaterials, Nanotechnologies and Manufacturing
| Editors: | F. Kongoli, F. Marquis, N. Chikhradze, T. Prikhna, M. De Campos, S. Lewis, S. Miller, S. Thomas. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2022 |
| Pages: | 290 pages |
| ISBN: | 978-1-989820-68-1(CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Transfer Rate Change by Concentration of Secondary Side Solution in Electrodialysis Using Lithium-Ion-Conductive Solid Electrolyte La0.57Li0.29TiO3
Hiroto Takahashi1; Kiyoto Shin-mura2; Ryoya Tokuyoshi3; Kazuya Sasaki1;1GRADUATE SCHOOL OF SCIENCE AND TECHNOLOGY, HIROSAKI UNIVERSITY, Hirosaki, Japan; 2, Hirosaki, Japan; 3DEPARTMENT OF SCIENCE AND TECHNOLOGY, HIROSAKI UNIVERSITY, Hirosaki, Japan;
Type of Paper: Regular
Id Paper: 71
Topic: 43
Abstract:
The demand for lithium is rapidly increasing with the production of lithium-ion batteries. Today’s lithium is produced from brine or ore [1]. The challenges of the former are long process time and large environmental burdens. The latter challenge is the high cost for high purity [2-3]. We have investigated lithium recovery by electrodialysis using a lithium ion conductive solid electrolyte La0.57Li0.29TiO3 (LLTO). When this recovery is performed in a batch system, the lithium ion concentration of the solution changes as the recovery of lithium proceeds. To increase the energy efficiency of recovery, the effects of various factors should be elucidated and optimized. In this study, we investigated the effect of lithium ion concentration in the secondary solution on lithium recovery rate by electrodialysis using LLTO.
An anode (primary side) and a cathode (secondary side) electrodes were prepared on the surface of LLTO using a platinum paste. A reference electrode was also formed on each surface. Electrodialysis was performed by applying a DC voltage of 2.0 V between the anode and the cathode. The electrochemical impedance was measured by a 2-terminal method and a 3-terminal method using a reference electrode. The primary side solution was a 1.0 M aqueous lithium hydroxide solution. The secondary side solution was pure water or an aqueous lithium hydroxide solution having a concentration of 10-3-1.0 M. The amount of transferred lithium was estimated by Faraday's law using the current value.
The lithium transfer rate reached a maximum when the lithium concentration in the secondary solution was 10-2M. It was confirmed that the electrolyte impedance near the secondary surface of the electrolyte decreased with increasing lithium concentration. Beacause the same impedance was obtained in the OCV state and at 2 V, the decrease in the electrolyte resistance can be attributed to the increase in the pH of the solution.
Keywords:
Energy; New and advanced technology;References:
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