Development of Fluorine Fixation Processes for the Horizontal Recycling of Lithium
In order to effectively recover Li from cathode active materials of lithium-ion batteries, model samples of LiCoO<sub>2</sub> mixed with polyvinylidene fluoride (PVDF) were calcined at temperatures of 350-700 °C under an Ar or air atmosphere. Complete Li recovery was achieved by calcining the model sample at 400 °C under an Ar atmosphere, followed by water leaching. Additionally, to immobilize PVDF-derived F, an impurity in Li purification, we explored the use of calcium compounds (Ca(OH)<sub>2</sub> and CaCO<sub>3</sub>) and a layered double hydroxide in both dry and wet processing methods. In the wet process, F was fixed by adding Ca(OH)<sub>2</sub> to an aqueous LiF solution containing 1000 ppm of F. We confirmed that 98.6% of F was successfully removed from the solution after repeated fixation procedures. Furthermore, the unreacted Ca in the solution was separated and removed as CaCO<sub>3</sub> by concentrating the solution.
Authors
- Ryo Kasuya (ORCID: https://orcid.org/0000-0001-9835-1017)
- Osamu Terakado (ORCID: https://orcid.org/0000-0001-8613-5579)
- Kei Ito (ORCID: https://orcid.org/0000-0003-2267-1289)
- Hideo Hayashi (ORCID: https://orcid.org/0000-0001-5179-0610)
- Shunsuke Kuzuhara (ORCID: https://orcid.org/0000-0002-8531-9285)
- Kazuki Fujiwara
- Natsuki Hosoya
Institutions
- National Institute of Technology, Hakodate College (JP)
- Sendai National College of Technology (JP)
- National Institute of Technology (JP)
- Tokyo Metropolitan Industrial Technology Research Institute (JP)
- National Institute of Advanced Industrial Science and Technology (JP)
Publication Details
- Journal
- Materials
- Published
- 2025-04-30
- DOI
- https://doi.org/10.3390/ma18092050
- Citations
- 2
- Primary Topic
- Extraction and Separation Processes
- Type
- article
- Field-Weighted Citation Impact
- 1.43
Funders
- Japan Society for the Promotion of Science