Abstract
The cathode active materials of spent lithium ion batteries contain significant amounts of lithium and cobalt, which is worthy of recycling. The cathode active materials were employed as raw materials. The effect of reduction on the leaching efficiency of Li+ and Co2+ was compared among glucose, ascorbic acid and hydrogen peroxide with tartaric acid as the acid leaching solution. The results show all three reducing agents can convert the Co3+ of the cathode active materials to soluble Co2+. The complex of Co(III) can also be found during the reduction process. All three reductants can promote the leaching efficiency of Co2+, while having a marginal effect on the leaching efficiency of Li+. The maximum leaching efficiency of Co2+ is 36.94% for 20 g/L glucose, 47.22% for ascorbic acid, and 69.66% for 15% hydrogen peroxide, respectively. Among the three, hydrogen peroxide exhibits the best reduction effect.
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