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Recovery of Li and Co From Waste Li-Ion Batteries Using Bipolar Membrane Electrodialysis with a Complexing Agent

Tuesday, November 9, 2010
Hall 1 (Salt Palace Convention Center)
Hiroki Nagasawa1, Yasunobu Yamashita2, Atsushi Iizuka3, Akihiro Yamasaki4 and Yukio Yanagisawa1, (1)Department of Environment Systems, The University of Tokyo, Kashiwa, Chiba, Japan, (2)Department of Chemical System Engineering, The University of Tokyo, Kashiwa, Chiba, Japan, (3)Research Center for Sustainable Materials & Engineering, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, Japan, (4)Department of Materials and Life Science, Seikei University, Musashino, Japan

A new recovery process of lithium and cobalt in waste Li-ion batteries was investigated using a bipolar membrane electrodialysis (BMED). To make the mutual separation of lithium and cobalt available, BMED treatment was performed in the presence of complexing agent such as EDTA. When the pH of the solution is 5 – 8, in the presence of EDTA, while lithium exists in the form of monovalent cation (Li+), cobalt exists in the form of divalent anion complex with EDTA (CoY2-). Therefore, under this condition, Li+ is separated through cation exchange membrane and CoY2- is separated through anion exchange membrane. The experimental studies was conducted with a solution containing LiNO3, Co(NO3)2 and EDTA. The effects of initial pH, concentration EDTA, and current density on the separation efficiency was evaluated.

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See more of this Session: Poster Session: General On Separations
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