The flourishing expansion of the lithium-ion batteries(LIBs) market has led to a surge in the demand for lithium resources. Developing efficient recycling technologies for imminent large-scale retired LIBs can signifi...The flourishing expansion of the lithium-ion batteries(LIBs) market has led to a surge in the demand for lithium resources. Developing efficient recycling technologies for imminent large-scale retired LIBs can significantly facilitate the sustainable utilization of lithium resources. Here, we successfully extract active lithium from spent LIBs through a simple, efficient, and low-energy-consumption chemical leaching process at room temperature, using a solution comprised of polycyclic aromatic hydrocarbons and ether solvents. The mechanism of lithium extraction is elucidated by clarifying the relationship between the redox potential and extraction efficiency. More importantly, the reclaimed active lithium is directly employed to fabricate LiFePO_(4) cathode with performance comparable to commercial materials. When implemented in 56 Ah prismatic cells, the cells deliver stable cycling properties with a capacity retention of ~90% after 1200 cycles. Compared with the other strategies, this technical approach shows superior economic benefits and practical promise. It is anticipated that this method may redefine the recycling paradigm for retired LIBs and drive the sustainable development of industries.展开更多
基金supported by the National Key Research and Development Program of China (2022YFB2404800)the National Natural Science Foundation of China (U1966214 and 22008082)。
文摘The flourishing expansion of the lithium-ion batteries(LIBs) market has led to a surge in the demand for lithium resources. Developing efficient recycling technologies for imminent large-scale retired LIBs can significantly facilitate the sustainable utilization of lithium resources. Here, we successfully extract active lithium from spent LIBs through a simple, efficient, and low-energy-consumption chemical leaching process at room temperature, using a solution comprised of polycyclic aromatic hydrocarbons and ether solvents. The mechanism of lithium extraction is elucidated by clarifying the relationship between the redox potential and extraction efficiency. More importantly, the reclaimed active lithium is directly employed to fabricate LiFePO_(4) cathode with performance comparable to commercial materials. When implemented in 56 Ah prismatic cells, the cells deliver stable cycling properties with a capacity retention of ~90% after 1200 cycles. Compared with the other strategies, this technical approach shows superior economic benefits and practical promise. It is anticipated that this method may redefine the recycling paradigm for retired LIBs and drive the sustainable development of industries.
基金This work was supported by the National Natural Science Foundation of China(21805219,51521001)the National Key Research and Development Program of China(2016YFA0202603)+1 种基金the Program of Introducing Talents of Discipline to Universities(B17034)the Yellow Crane Talent(Science&Technology)Program of Wuhan City.
文摘通过一种简单且可控的方法合成了四种晶型的Nb2O5微米球(TT-Nb2O5,T-Nb2O5,M-Nb2O5,H-Nb2O5).将它们作为锂离子电池负极进行电化学性能测试,相较TT-Nb2O5, T-Nb2O5和H-Nb2O5, M-Nb2O5表现出更高的可逆容量、更好的循环稳定性和优异的倍率性能. M-Nb2O5在0.2 A g^-1的电流密度下,表现出163 m Ah g^-1的比容量,循环1000圈后的容量保持率为82.3%. M-Nb2O5电极材料在充放电过程中呈现扩散控制、高度可逆的锂离子脱嵌机制,表现出更高的本征电导,在22.51 mg cm^-2的超高负载量下能够实现高达2.24 m Ah cm^-2的面积比容量.在12.12 mg cm^-2的负载量下,循环100圈后的容量保持率为95.1%,表明此材料具有良好的循环稳定性.此外,还通过电化学测试、密度泛函理论计算以及原位XRD测试进一步解释了M-Nb2O5高的电子传输和锂离子传输动力学特征.
