Abstract
Reductive leaching of LiCoO 2 from spent lithium ion battery was investigated in terms of reaction variables. The leaching efficiency of LiCoO 2 increased with increasing temperature, and concentration of HNO 3, but with decreasing solid/liquid (S/L) ratio. Li and Co from LiCoO 2 were leached over 95% with the addition of 1.7 vol.% H 2O 2 as a reducing agent. This is due to the reduction of Co 3+ to Co 2+ which can be readily dissolved. The dissolution rates of Co and Li were inversely proportional to their respective concentrations in the solution. Apparent activation energies of 12.5 and 11.4 kcal/mol were obtained for Co and Li, respectively. This indicates that the dissolution of LiCoO 2 is controlled by surface chemical reaction.
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