Synthesis and Recyclability of Sheet-like Cobalt Carbonate Recovered from Spent Li-Ion Batteries Using a Simple Hydrometallurgy Process

Sustainability

Marwa Tayoury¹  Mouad Dahbi¹  Afaf Yaden¹  Jones Alami¹  Nabil Elhalya¹  Mohamed Aqil¹  Loubna Hdidou¹  Abdelhay Aboulaich¹ 

[1] Materials Science, Energy and Nano-Engineering Department, Mohammed VI Polytechnic University (UM6P), Lot 660, Hay Moulay Rachid, Bengurir 43150, Morocco;

关键词: recycling;    Li-ion battery;    cobalt carbonate;    regenerated LiCoO₂;    electrochemistry;   

DOI  :  10.3390/su14052552

来源: DOAJ

【 摘 要 】

In the present manuscript, a simple hydrometallurgy process for recovering and recycling cobalt from spent lithium cobalt oxide LiCoO₂ (LCO) in lithium-ion batteries (LIBs) is described. First, the black material (BM) containing LCO active material is extracted by discharging, dismantling and detachment of cathode active materials with an organic solvent. Then, sulfuric acid (H₂SO₄) and hydrogen peroxide (H₂O₂) are used to fully dissolve Co and Li in an aqueous solution at high dissolution efficiency (more than 99% of Li and Co). After a purification step, Co is selectively precipitated and separated from Li, as CoCO₃, using a simple method. Results show that the obtained CoCO₃ crystals have a unique sheets-like structure with a purity of more than 97% and could be reused to regenerate LCO active material for LIB. The as-prepared sheet-like CoCO₃ was then converted to flower-like LCO through a solid-state reaction with commercial lithium carbonate (Li₂CO₃). Electrochemical performances of the regenerated LCO (LCO_Reg) in LIB have been studied. Interestingly, the flower-like LCO_Reg showed a good charge capacity of about 145 mAh.g⁻¹ at the first cycle, compared to LCO synthesized from commercial cobalt and lithium precursors (LCO_Com). Specific charge capacity and columbic efficiency also remained relatively stable after 60 charge/discharge cycles. The proposed recycling process of Co in the present work doesn’t require the use of the complicated and expensive solvent extraction method and thus it is simple, cost-effective, environmentally-friendly and could be used for recovering high purity critical metals such as Co and Li from spent LIBs at the industrial scale.

【 授权许可】

Unknown