Separation Of NMC And Carbon Nanoparticles Via Sedimentation For Lithium-Ion Battery Direct Recyclin
University of Delaware
Lithium-ion batteries are used in a variety of electronics today and are expected to increase in usage with the rise in electric vehicles. However, the recycling processes of these batteries must be improved to reduce or eliminate the environmental harm created by them. This thesis features the separation of cathode active material in water through the use of a sedimentation pool. The settling behavior of NMC and carbon nanoparticles is characterized by a set of graduated cylinder experiments, where it was found that carbon nanoparticles will typically float in water if they do not form large agglomerates. Observations from this set of trials align with the principles of Stokes’ Law and the interparticle collision theory. Operating parameters of the constructed sedimentation pool were determined through flow visualization and NMC displacement trials. In the NMC region of the sedimentation pool, 92 wt.% of the collected particles were determined to be NMC through the use of thermogravimetric analysis. In the carbon region of the pool, 60 wt.% of the sample collected was NMC. The large amount of NMC collected in the carbon region is suspected to be a result of the formation of carbon agglomerates which trap the metal oxide. The conclusion of the report discusses design recommendations.
Batteries, Recycling, NCM, Carbon nanoparticles