PEMUNGUTAN LOGAM KOBALT (Co) DARI LIMBAH LITHIUM�ION BATTERIES (LIB) MENGGUNAKAN ASAM SITRAT

Leaching process of Cobalt (Co) compound from spent Lithium�Ion Batteries (LIB) by using citric acid as the leaching agent and H2O2 as the reductant had been conducted. The variated parameters are the amount of H2O2 added and leaching temperature. Before being leached, LIB was opened manually and immersed into 1 wt.% NaCl solution for 3�4 hours to discharge. The cathode active material was then calcinated at 700oC for 3 hours to remove its carbon and polyvinylidene fluoride (PVDF) bound which bind the active material of cathode. LiCoO2 which is cathode active material was then leached by citric acid 1,25 M and S/L ratio of 20 g/L. The sample was taken at certain interval of time and the amounts of Co in the sample were analyzed by Atomic Absorption Spectrophotometry (AAS). From the experiment it can be seen that the amount of H2O2 added affected the recovery leaching Co compound, in which the higher amount of H2O2 added, the higher the recovery leaching was. Within 30 minutes as 57,084% of Co compound can be leached without the presence of reductant and as 81,537% can be leached with the addition of H2O2 as 1,5% (v/v). Besides, the increase of leaching temperature can also increase the percentage of Co compound recovery leaching. The highest percentage of Co compound recovery leaching obtained was 82,734% at the temperature of 90oC