The proliferation of vehicles and portable devices has led to a significant increase in the number of spent lithium-ion batteries (LIBs). Recycling these spent LIBs is crucial to prevent negative environmental impacts and resource wastage. However, traditional pyrometallurgical and hydrometallurgical methods suffer from inherent drawbacks as being time-consuming, energy-intensive and causing secondary pollution. Herein, an innovative approach is proposed to direct regenerate degraded LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM111) in-situ by combining hydrothermal treatment with solid-state sintering. Structural and morphology characterizations reveal that the amorphous layer near the surface of degraded NCM111 (D-NCM111) are dissolved after the hydrothermal treatment, restoring the original layered structure due to the relithiation reaction, whereas the target stoichiometric ratios of transition metal elements are achieved through the solid-state sintering process. The regenerated NCM111 (R-NCM111) exhibits a high discharge specific capacity of 152.3 mAh/g at 0.1 C and a capacity retention of 96.1% at 1 C after 300 cycles. The recycling method presented in this work is not only facile but also scalable, potentially opening a new pathway to address the environmental challenges posed by massive spent LIBs.
Jun Pan,Huili Peng,Yehao Yan,Yuzhou Bai,Jian Yang,Nana Wang,Shixue Dou,Fuqiang Huang
Polymer solid-state batteries (SSBs) possess the advantages of good interfacial contact, but their application faces low ionic conductivity. Here, three-dimensional (3D) porous composite polymer electrolytes with propylene carbonate plasticizer (3D-PPLLP-CPEs) fabricated effectively, displaying high ionic conductivity even at room temperature. Electrochemical in-situ polymerization of 3D-PPLLP-CPEs occurs during the first discharge process, avoiding safety issues caused by the liquid plasticizer without sacrificing the ionic conductivity of the electrolyte. Besides, the controllable in-situ generated LiF-enriched interface can avoid the Li dendrite growth. To further promote the practical value of SSBs, micro-sized Si@Li 3 PO 4 @C with high initial Coulombic efficiency was adopted to replace lithium foil. The LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM111)//Micro Si@Li 3 PO 4 @C full cell has achieved capacity of 129.1 mAh g −1 at a current density of 0.2 C, with capacity retention of 98.5% after 100 cycles, which is the best performance based on the Si anode in SSBs. Even at the high current density of 2.0 A g −1 , the capacity remains 92.5 mAh g −1 . This design of CPEs and electrodes has paved a new way to construct practical SSBs.
危险品化学品经营许可证（带存储）