Lithium fluoride recovery from cathode material of spent lithium-ion battery
10.1039/C8RA00061A
This study investigates a hydrometallurgical method for recovering lithium fluoride from spent lithium-ion batteries (LIBs) to address environmental pollution and resource shortage issues. The researchers used formic acid and hydrogen peroxide to selectively leach lithium and cobalt from the cathode material. By optimizing parameters such as leaching temperature, time, stoichiometric ratio, H2O2 concentration, and solid-to-liquid ratio, they achieved leaching efficiencies of 99.90% for lithium and 99.96% for cobalt. The leaching kinetics were evaluated, revealing that the process fits a chemical control model with apparent activation energies of 44.12 kJ/mol for lithium and 51.75 kJ/mol for cobalt. Through fractional precipitation, high-purity (99.0%) lithium fluoride was obtained. This study demonstrates an effective and environmentally friendly approach to recycling valuable metals from spent LIBs, contributing to sustainable resource management.
Sound speed measurements in lithium fluoride single crystals shock compressed to 168?GPa along [100]
10.1063/5.0056659
This research investigates the shock wave response of [100] lithium fluoride (LiF) single crystals under high stress, aiming to address conflicting reports about the melting point of LiF under shock compression. The study conducted plate impact experiments using a two-stage light gas gun facility, compressing LiF single crystals to 168 GPa and measuring wave profiles with laser interferometry. The results show that the measured sound speeds in the shock-compressed LiF increase monotonically with stress, with no evidence of the previously reported sound speed drop at 152 GPa, thereby establishing a lower bound of 168 GPa for the onset of melting in shock-compressed LiF single crystals. This finding challenges earlier reports of melting between 134 and 152 GPa and suggests that the onset of melting may occur at higher stresses, around 200 GPa, as indicated by the loss of optical transparency in previous studies.
10.1073/pnas.1911017116
This research investigates the role of lithium fluoride (LiF) in solid electrolyte interphases (SEIs) on lithium metal anodes, aiming to understand its intrinsic protective function and impact on lithium (Li) cycling behavior. The study compares ex situ and in situ LiF-enriched SEIs, finding that the mechanical integrity of ex situ LiF layers is easily compromised during cycling, failing to protect Li. In contrast, in situ LiF SEIs, formed from fluorinated electrolytes, show better performance due to their ability to repair and maintain a thin, compact SEI layer. The research demonstrates that the stability and performance of LiF-enriched SEIs are highly dependent on the electrolyte's ability to continuously repair the interface, rather than the intrinsic properties of LiF itself. The findings highlight the importance of considering the combined role of ionic and electrolyte-derived layers in future design strategies for improved Li battery performance.
T
T:Toxic;
