ORALS

SESSION: ElectrochemistryTueAM-R2	Amatore International Symposium on Electrochemistry for Sustainable Development
Tue Nov, 6 2018 / Room: Copacabana B (150/1st)
Session Chairs: Tsuyoshi Hoshino; Session Monitor: TBA

12:35: [ElectrochemistryTueAM04] Invited
Lithium Recycling from Used Li-ion Batteries using Innovative Electrodialysis with Lithium Ionic conductor
Tsuyoshi Hoshino¹ ; ¹Rokkasho Fusion Energy Research Centre, Rokkasho-mura, Kamikita-gun, Japan;
Paper Id: 100 [Abstract]

In recent years, the industrial importance of lithium (Li) has increased due to its use in Li-ion batteries. Previously, the author had developed a method for the recovery of Li from seawater using a Li ionic superconductor functioning as a Li-ion separation membrane (LISM). In this method, only Li ions were successfully recovered from seawater through the LISM. Consequently, the author then developed a new innovative method for recycling Li from used Li-ion batteries using the LISM. This innovative method involves the use of an LISM, whereby only Li ions in a solution of used Li-ion batteries permeate from the positive electrode side to the negative electrode side during electrodialysis; the other ions, including Co, Al, and F, do not permeate the membrane. Li_0.29La_0.57TiO₃ was selected as the LISM. The positive side of the dialysis cell was filled with used Li-ion battery solution. Then the negative side was filled with distilled water. The applied dialysis voltage was 5 V, and electrode area was 16 cm2. The Li recovery ratio increased with electrodialysis time. Subsequently, Co, Al, and F were not permeated. After electrodialysis, CO₂ gas was bubbled in the Li recovery water to produce lithium carbonate (Li₂CO₃) as a raw material for Li-ion batteries. The Li₂CO₃ deposition was easily generated by the reaction of CO₂ gas and the Li recovery solution as a lithium hydroxide (LiOH) solution. This new method for recycling Li-ion batteries shows good energy efficiency and is easily scalable. Thus, this electrodialysis method is suitable for the recovery of Li from used Li-ion batteries.

References:
[1] T. Hoshino, Desalination, 359, 59-63 (2015).