Electrowinning of lithium from LiOH in molten chloride

Osamu Takeda, Mingming Li, Takahiro Toma, Keita Sugiyama, Masayoshi Hoshi, Yuzuru Sato

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)D820-D823
JournalJournal of the Electrochemical Society
Volume161
Issue number14
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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