In situ X-ray diffraction and thermal analysis of LiNi0.8Co0.15Al0.05O2 synthesized via co-precipitation method

摘要

LiNi0.8Co0.15Al0.05O2 (NCA) material is successfully synthesized with a modified co-precipitation method,in which NH3.H2O and EDTA are used as two chelating agents.The obtained LiNi0,8Co0J5Al0.05O2 material has well-defined layered structure and uniform element distribution,which reveals an enhanced electrochemical performance with a capacity retention of 9Z9％ after 100 cycles at 0.2 C,and reduced thermal runaway from the isothermal calorimetry test.In situ X-ray diffraction (XRD) was employed to capture the structural changes during the charge-discharge process.The reversible evolutions of lattice parameters (a,b,c,and V) further verify the structural stability.