Study On Reclaiming Cathodic Material LiCoO₂ From Spent Lithium Ion Batteries

The process of reclaiming valuable metals in positive active materials from spent lithium ion batteries was studied. NMP leaching rate of wastes reaches 100%. The recovery rates of cobalt and lithium get up to 95.06% and 84.02% using mixture solution including sulfuric acid and hydrogen peroxide. respectively.The optimal technological conditions of preparing precursor by co-precipitation process were investigated. The effects of heat-treating on crystal structure of calcined samples were studied. The XRD result shows that the powders prepared at 750℃is the mono-phase crystal structure and well- crystallized in the hexagonal system with space group R-3m. The specific areas of LiCoO₂ powders calcined at 750℃reach 18.55m²/g by BET technique. The average particle size of powder (about 70nm) is observed by SEM. LiCoO₂ prepared at 750℃exhibits excellent performances in term of its high first charge capacity (146 mAh·g^-1) and discharge capacity (142 mAh·g^-1).A sort of composite precipitates in a core-shell form, where the CoOHNO3 was the core and Li₂CO₃ was the shell, were prepared with NH3·H2O and NH4HCO3 as precipitator and PEG as dispersant in the solution with an aqueous nitrate solution containing cobalt ions and lithium ions from spent lithium ion batteries as raw materials The crystal structure of calcined powder was investigated by XRD.LiCoO₂ is layered structure in the hexagonal system with space group R-3m by IR and Raman spectrum analysis. The result shows that layered attribution strengths with baking temperature increasing. The specific surface area (about 7.949m2g^-1) of the powder was measured by BET method. The particles configuration & the average particle size ( lower 0.2μm) of the LiCoO₂ powder were observed by SEM and the grain size increases with temperature. The size of particles prepared by...