Selective recovery of lithium from spent lithium iron phosphate batteries using oxidation pressure sulfuric acid leaching system
De-you WU, Dong-xing WANG, Zhi-qiang LIU, Shuai Rao, Kui-fang ZHANG
Abstract
Oxidation pressure leaching was proposed to selectively dissolve Li from spent LiFePO4 batteries in a stoichiometric sulfuric acid solution. Using O2 as an oxidant and stoichiometric sulfuric acid as leaching agent, above 97% of Li was leached into the solution, whereas more than 99% of Fe remained in the leaching residue, enabling a relatively low cost for one-step separation of Li and Fe. And then, by adjusting the pH of leachate, above 95% of Li was recovered in the form of the Li3PO4 product through iron removal and chemical precipitation of phosphate.
Topics & Concepts
Leaching (pedology)Sulfuric acidIron phosphateStoichiometryLeachateChemistryInorganic chemistryPhosphateSelective leachingLithium iron phosphateNuclear chemistryElectrochemistryEnvironmental chemistryOrganic chemistryElectrodeEnvironmental scienceSoil waterPhysical chemistrySoil scienceExtraction and Separation ProcessesAdvancements in Battery MaterialsAdvanced Battery Materials and Technologies