Selective extraction of lithium ions from spent electrode materials enhanced by mechanical grinding
Selective extraction of lithium ions from electrode materials is an important step in the recycling process of spent lithium-ion batteries.In this study,selective extraction of lithium ions from electrode material derived from spent lithium ion battery was enhanced by low temperature heat treatment-mechanical grinding-sieving for impurity removal.Through the phase,morphology,surface element chemical forms and particle size,the enhancing mechanism of selective extraction of lithium from electrode materials by the pretreating process was analyzed.The results show that the migration of partial lithium ion can be realized synchronously during the removal of organic binders at low temperature of 500℃in an oxygen-free atmosphere.Large particle aggregates can be dissociated by wet mechanical grinding while 16.09%of lithium ion can be recycled at the same time.After mechanical grinding and screening,aluminum content in eletrode material decreases from 3.25%to 0.63%(mass fraction)while copper content decreases from 2.75%to 0.48%(mass fraction).In addition,more than 80%of copper and aluminum can be removed in the sieving process.Pretreatment can effectively promote the reduction process between graphite and cathode materials,which can strengthen the migration of lithium ions in electrode materials.After low temperature roasting-mechanical grinding-sieving process,selective extraction efficiency of lithium from electrode materials increase from 76.81%to 86.08%.
spent lithium-ion batteryelectrode materialreduction roastingselective extraction of lithiumprocess intensification
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