Energy balance of lithium recovery by electrodialysis using La_(0.57)Li_(0.29)TiO_3 electrolyte

摘要

The energy balance of lithium recovery by electrodialysis using the solid electrolyte La0.57Li0.29TiO3 was investigated using AC impedance spectroscopy and overpotential measurements. It was found that most input energy is consumed in the electrolysis of the water associated with electrodialysis. Despite the use of lowperforming model electrodes and electrolyte plates with low Li+ conductivity, most of the overpotential was due to the diffusion impedance of the Li+ between the electrode surface and the offshore in the secondary solution. This suggests that reduction of the solution's diffusion impedance is the key to increasing the lithium recovery rate in an energy-efficient way.