Fujiwara Kazuki, Ito Kaisei, Kuzuhara Shunsuke, Terakado Osamu, Hosoya Natsuki, Hayashi Hideo, Kasuya Ryo
National Institute of Technology, Sendai College, 48 Nodayama Medeshima-Shiote, Miyagi, Natori 981-1239, Japan.
National Institute of Technology, Hakodate College, Tokura-cho 14-1, Hokkaido, Hakodate 042-8501, Japan.
Materials (Basel). 2025 Apr 30;18(9):2050. doi: 10.3390/ma18092050.
In order to effectively recover Li from cathode active materials of lithium-ion batteries, model samples of LiCoO 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) and CaCO) and a layered double hydroxide in both dry and wet processing methods. In the wet process, F was fixed by adding Ca(OH) 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 by concentrating the solution.
为了从锂离子电池的阴极活性材料中有效地回收锂，将与聚偏二氟乙烯（PVDF）混合的LiCoO模型样品在氩气或空气气氛下于350-700°C的温度下煅烧。通过在氩气气氛下于400°C煅烧模型样品，然后进行水浸出，实现了锂的完全回收。此外，为了固定PVDF衍生的氟（锂纯化中的一种杂质），我们探索了在干法和湿法处理中使用钙化合物（Ca(OH)₂和CaCO₃）以及层状双氢氧化物。在湿法过程中，通过向含有1000 ppm氟的LiF水溶液中添加Ca(OH)₂来固定氟。我们证实，经过反复固定程序后，98.6%的氟成功从溶液中去除。此外，通过浓缩溶液，溶液中未反应的钙以CaCO₃的形式分离并去除。
