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Dr. Tsuyoshi Hoshino

Breeding Functional Materials Development Group, Department of Blanket Systems Research, Rokkasho Fusion Institute, Fusion Energy Research and Development Directorate, National Institutes for Quantum and Radiological, Japan


Talk Title
Lithium Recovery from Seawater and Batteries by Innovative Electrodialysis using a Lithium Ionic Superconductor Membrane

Talk Abstract

Lithium (Li) is rapidly becoming a valuable commodity. To reduce carbon emissions that contribute to global warming, the world is increasingly turning to Li-ion batteries to power electric vehicles and to store power in the home. In addition, tritium can also be produced by the reaction of lithium with neutrons in tritium-breeding materials, which can then be used to power fusion reactors. I have developed a unique method to recover Li from seawater using an innovative dialysis process where Li permeates from the negative electrode to the positive electrode of a dialysis cell through a Li ionic superconductor functioning as a Li separation membrane (LISM). Experimental measurements of Li-ion concentrations on the positive electrode side revealed that the Li recovery ratio increased to approximately 7% after 72 h with no applied electric voltage, generating electrical power of 0.04 V at 0.1 mA. Moreover, with both ends of the LISM bound with a negative and positive electrode, the hydrated Li ions were transformed to pure Li ions because only Li ions were able to permeate through the LISM, while other ions in the seawater remained on the negative side of the LISM. Furthermore, I developed a process to recycle Li from used Li-ion batteries. Li0.29La0.57TiO3 was selected as the LISM because it exhibits high durability in water. The area and thickness of the LISM are 25 cm2 (5.0 × 5.0 cm) and 0.5 mm, respectively. The positive side of the dialysis cell was filled with Li-ion solution from used batteries, and the negative side was filled with distilled water. Using an electrode area of 16 cm2, the applied dialysis voltage was 5 V and the duration of dialysis was 72 h. The Li recovery ratio increased with electrodialysis time, reaching approximately 10% after 72 h of dialysis. This innovative method for recycling Li-ion batteries displayed good energy efficiency and is easily scalable. This unique method is a viable process for recycling the used Li-ion batteries and has promising applications in the recovery of Li and other rare metals from seawater.

Short Biography

Dr. Tsuyoshi Hoshino obtained his Ph.D degree in engineering from the University of Tokyo in 2003. He joined the National Institutes for Quantum and Radiological Science and Technology(QST) as a Senior Principal Researcher. As a Responsible Officer for the Broader Approach (BA) project at the International Fusion Energy Research Centre (IFERC), Dr. Hoshino has been primarily focused on the R&D of advanced tritium breeders for fusion reactors. Demonstration power reactors (DEMOs) require advanced tritium breeders (lithium ceramics) that have high stability at high temperatures. The development of advanced tritium breeders has been underway at the DEMO R&D facility at the IFERC as a part of the BA project since 2007. Furthermore, Dr. Hoshino has also been involved in the R&D of lithium isotope separation and lithium recovery from seawater for Li-ion batteries as the project leader in Japan’s domestic programme. He proposed his innovative lithium recovery technology for the funding programme of the Next Generation World-Leading Researchers (NEXT Program) sponsored by the Cabinet Office of the Government of Japan, with an award of 1.6 billion Japanese yen (about 2M$) over 4 years. R&D efforts conducted under this programme have been very successful, and this technology continues to attract major attention from electric vehicle developers and other industries using Li-ion batteries.

Talk Keywords
Lithium Recovery; Seawater; Li-ion Batteries; Lithium Ionic Superconductor; World-First Dialysis.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

The International Conference on Innovative Applied Energy (IAPE’18)