Study On Preparation And Performance Of Ni,Co,and Mn Composite Oxide Anodes By Recycling Spent Lithium-ion Batteries

Lithium-ion batteries are widely used in new energy vehicles,mobile phones,and other fields for their high safe operation,long service life,high energy density,and low self-discharge.Li Ni_1-x-yCo_xMn_yO₂ lithium-ion power battery,as the most installed battery of new energy vehicles,is facing the problem of large-scale scrap.The spent Li Ni_1-x-yCo_xMn_yO₂ cathode material contains a lot of harmful substances and precious metals.If not handled correctly,they will cause environmental pollution and waste of resources.Therefore,it has important significance to reuse,resource and recycle the spent lithium-ion batteries with harmlessness.In this paper,we effectively recovered the spent Li Ni_1-x-yCo_xMn_yO₂ lithium-ion battery by hydrometallurgical technology.Transition metal oxides have attracted wide attention because of their various oxidation reduction states and higher discharge specific capacities and have been considered as a promising anode material for lithium-ion batteries and electrochemical energy storage systems.In this paper,(Ni_0.1Co_0.3Mn_0.6)₃O₄ and NiCo₂O₄ anode materials were synthesized by carbonate co-precipitation method and sol-gel method respectively,and the leaching solution of spent Li Ni_0.6Co_0.2Mn_0.2O₂ lithium-ion batteries was used as the starting solution.These two anode materials were characterized by inductive coupled plasma emission spectrometer,X-ray photoelectron spectroscopy,X-ray diffraction analysis,scanning electron microscopy and electrochemical measurements.Transition metal oxides have attracted wide attention because of their various oxidation reduction states and higher discharge specific capacities and have been considered as a promising anode material for lithium-ion batteries and electrochemical energy storage systems.In this paper,(Ni_0.1Co_0.3Mn_0.6)₃O₄ and NiCo₂O₄ anode materials were synthesized by carbonate co-precipitation method and sol-gel method respectively.And the leaching solution of spent Li Ni_0.6Co_0.2Mn_0.2O₂ lithium-ion batteries was used as the starting solution.The results show that the(Ni_0.1Co_0.3Mn_0.6)₃O₄ and NiCo₂O₄ anode materials have high discharge specific capacities,excellent cycle performances and rate performances.The initial discharge specific capacity of(Ni_0.1Co_0.3Mn_0.6)₃O₄ anode material is 1575m Ah·g^-1 when the current density is 100 m A·g^-1,and the discharge specific capacity can still be maintained at 659 m Ah·g^-1 after 50 cycles.When the current density was100,200,300,400 and 500 m A·g^-1,the corresponding discharge capacities of NiCo₂O₄anode material are stable at 1257,1160,1014,837 and 703 m Ah·g^-1,respectively.When the current density returned to 100 m A·g^-1,the average capacity can be restored to 1025 m Ah·g^-1.