首页|Highly efficient recovery of waste LiNixCoyMnzO2 cathode materials using a process involving pyrometallurgy and hydrometallurgy
Highly efficient recovery of waste LiNixCoyMnzO2 cathode materials using a process involving pyrometallurgy and hydrometallurgy
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Substantial environmental and economic benefits can be achieved by recycling used lithium-ion batteries.Hydrometallurgy is often employed to recover waste LiNixCoyMnzO2 cathode materials.As Ni,Co and Mn are transition metals,they exhibit similar properties;therefore,separating them is difficult.Thus,most researchers have focused on leaching processes,while minimal attention has been devoted to the separation of valuable metals from waste LiNixCoyMnzO2 cathode materials.Herein,we propose an environment-friendly,gentle process involving the usage of pyrometallurgy and hydrometallurgy to gradually leach valuable metals and effectively separate them.Interestingly,Li is recovered through a reduction roasting and water leaching process using natural graphite powder,Ni and Co are recovered through ammonia leaching and extraction processes and Mn is recovered through acid leaching and evaporation-crystallization processes.Results show that～87％Li,97.01％Co,97.08％Ni and 99％Mn can be leached using water,ammonia and acid leaching processes.The result obtained using the response surface methodology shows that the concentration of(NH4)2SO3 is a notable factor affecting the leaching of transition metals.Under optimal conditions,～97.01％Co,97.08％Ni and 0.64％Mn can be leached out.The decomposition of LiNixCoyMnzO2 is a two-step process.This study provides valuable insights to develop an environment-friendly,gentle leaching process for efficiently recycling valuable metals,which is vital for the lithium-ion battery recycling industry.
Waste LiNixCoyMnzO2 cathode materialsLeachingEffective separationSeries process
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