Enhanced Selective Recovery of Lithium from Spent Lithium Cobalt Oxide Cathode Materials Co-Roasted with Cobalt Sulfate
Recycling of waste lithium-ion batteries is of great significance in solving the supply of key metal resources and promoting the healthy and sustainable development of the new energy industry.The existing lithium-ion battery recycling process has problems such as low lithium recovery rate,the need to introduce exogenous additives and secondary pollution.The effects of factors such as cobalt sulphate dosage,roasting conditions such as roasting temperature and roasting time,and leaching conditions during the leaching process on the selective extraction of lithium from spent lithium cobalt oxide with cobalt sulfate as roasting additive were researched,and the reaction mechanism was explored through the studies of thermodynamics,thermochemical behaviors,and structural transformations of the physical phases during the reaction process.The results show that the leaching rate of lithium can reach 98.11％,while the leaching rates of nickel,cobalt and manganese are all lower than 0.5％at the material ratio of n(CoSO4)∶n(2Li)=1∶1,roasting temperature of 750 ℃ and roasting time of 2 h.When CoSO4·7H2O reacts with LiCoO2,the dehydration reaction of CoSO4·7H2O occurs first,and then the reaction between CoSO4 and LiCoO2 generates Li2SO4 and Co3O4.This process has the advantages of high lithium recovery,no need to introduce exogenous additives and no secondary pollution.After leaching,the leach residue can be reclaimed to prepare cobalt sulphate to achieve recycling,and it has the prospect of industrial application.
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