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This work presents an enhanced hydrometallurgical process for recycling lithium ion batteries. First, end-of-life batteries were processed in a physical pre-treatment plant to obtain a representative electrode material. The resulting leachate was purified forth by iron-precipitation, liquid-liquid extractions, and an innovative Li-Na separation, in order to obtain valuable products. These products include high-grade graphite, cobalt oxide (Co 3 O 4 , purity 83%), cobalt oxalate (CoC 2 O 4 , purity 96%), nickel oxide (NiO, purity 89%), and lithium carbonate (Li 2 CO 3 , purity 99.8%). The recovery rate was quantitative for graphite, between 80% and 85% for cobalt depending on the nature of the recovery method, 90% for nickel, and 72% for lithium. Secondary streams were also valorized to obtain sodium sulfate (Na 2 SO 4 , purity 96%), and MnCoFe 2 O 4 magnetic nano-sorbents according to the zero-waste concept. In order to close the loop, recycled Co 3 O 4 and NiO were used as conversion-type anode materials for advanced lithium ion batteries showing promising performances.

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