Journal article

Production of lithium hydroxide by electrodialysis with bipolar membranes

Xia Chen, Xinyu Ruan, Sandra E Kentish, Gang Kevin Li, Tongwen Xu, George Q Chen

SEPARATION AND PURIFICATION TECHNOLOGY | ELSEVIER | Published : 2021

Abstract

In conventional lithium extraction processes, highly purified lithium sulfate is generated as an intermediate, which is transformed into lithium hydroxide for lithium-ion battery applications. This study illustrates the technical feasibility of converting the pre-purified lithium sulfate (Li2SO4) into lithium hydroxide (LiOH) and sulfuric acid (H2SO4) using an electrodialysis with bipolar membrane (EDBM) process. A feed solution of 1.5 mol/L Li2SO4 is converted into 2.2 mol/L LiOH and 1.3 mol/L H2SO4 with a specific energy consumption of less than 10 kWh/kg LiOH produced. Due to the increased acid and base volume caused by electroosmosis, both acid and base concentrations are lower than that..

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Grants

Awarded by PhD Research Startup Foundation of Anhui Jianzhu University


Funding Acknowledgements

Xia Chen would like to acknowledge the financial support from the China Scholarship Council and the PhD Research Startup Foundation of Anhui Jianzhu University (2020QDZ33). George Chen acknowledges support from an Early Career Researcher (ECR) Grant awarded by the Melbourne School of Engineering, The University of Melbourne.