Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 161, Issue 14, Pages D820-D823Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0871414jes
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [21246113]
- Grants-in-Aid for Scientific Research [21246113] Funding Source: KAKEN
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An investigation was carried out to determine the viability of electrowinning lithium from LiOH in molten chloride, with a view to developing a system for the storage and transportation of hydrogen using LiH as the storage medium. It was predicted from the chemical potential diagram for the Li-O-H system that Li metal cannot be electrowon from a LiOH-containing salt, as any Li generated by electrolysis will readily react with LiOH to form Li2O. Electrolysis in molten LiCl-42 mol% KCl or molten LiCl-17 mol% KCl-26 mol% CsCl was therefore utilized, in which LiOH was fed into an anode compartment separated from the Li metal deposited at the cathode by a porous magnesia diaphragm, thereby preventing the transportation of LiOH into a cathode compartment. Using this arrangement, Li metal was successfully obtained with a cathode current efficiency of 84-86%. The generation of CO2 at the graphite anode was also found to decrease with decreasing electrolysis temperature when using a chloride melt with a lower eutectic temperature. (C) The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. All rights reserved.
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