Cleaner and effective recovery of metals and synthetic lithium-ion batteries from extracted vanadium residue through selective leaching

A process for recycling steelmaking waste is proposed, and high value-added lithium-ion batteries (LIBs) electrode materials LiFePO4 and Li4Ti5O12 are prepared. The precursor material FePO4 center dot xH(2)O is prepared from the iron-rich filtrate formed after HCl leaching the waste residue. Using FePO4 center dot xH2O and Li2CO3 as raw materials by the carbothermal reduction method, LiFePO4 containing a small amount of metal doping is prepared. By comparing the XRD patterns, it is found that the purity of the synthesized LiFePO4 material is higher if the precursor whose Fe-P molar ratio is close to the theoretical value of 1 is used as the raw material. The initial discharge capacity of LiFePO4/C at 0.1C is 139.3 mAh.g(-1), and after 50 cycles, the capacity retention rate is 94.97%. In sulfuric acid medium, NH3 center dot H2O and H2O2 are used to selectively leaching Ti from the titanium-rich slag. High-purity TiO2 is prepared by calcining the peroxy titanium compound. The spinel-type lithium-ion battery anode material Li4Ti5O12 is prepared with TiO2 as the precursor. The initial discharge capacity of the battery assembled with Li4Ti5O12 at 0.1C is 163.3 mAh.g(-1). This study is helpful to solve the environmental pollution problem and the energy crisis.

Automated summary

A process for recycling steelmaking waste and preparing high value-added lithium-ion batteries (LIBs) electrode materials LiFePO4 and Li4Ti5O12 was proposed. The study showed improved purity and performance of the materials synthesized from the waste residue, providing a potential solution to environmental pollution and energy crisis.