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Updated: May 15, 2025
Non-aqueous Electrode Processing and Construction of Lithium-ion Coin Cells
Published on: February 1, 2016
Development of Fluorine Fixation Processes for the Horizontal Recycling of Lithium
Kazuki Fujiwara1, Kaisei Ito1, Shunsuke Kuzuhara1
1National Institute of Technology, Sendai College, 48 Nodayama Medeshima-Shiote, Miyagi, Natori 981-1239, Japan.
Abstract:
In order to effectively recover Li from cathode active materials of lithium-ion batteries, model samples of LiCoO2 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)2 and CaCO3) and a layered double hydroxide in both dry and wet processing methods. In the wet process, F was fixed by adding Ca(OH)2 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 CaCO3 by concentrating the solution.
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