Preparation of single crystal NCM811 cathode materials and study on their electrochemical properties
Nickel-rich layered cathode materials,specifically LiNi0.8Co0.1Mn0.1O2(NCM811),have garnered significant attention due to their high charge/discharge specific capacity.However,these materials are prone to structural degradation and interfacial instability during cycling.To address these issues,single crystal NCM811(SC-NCM)materials are successfully synthesized through using a multistep calcination method in conjunction with ball milling method,and their electrochemical performance is tested.It is found that the half-cell,which is assembled with SC-NCM as the cathode and lithium wafers as anode,exhibits a first-cycle Coulombic efficiency of 85.4％.Additionally,it maintains a capacity retention rate of 86.2％after 200 cycles at 1 C.The full-cell,which is assembled with graphite as anode and SC-NCM as cathode,achieves a 94.1％of capacity retention rate under the same conditions.The differences between conventional NCM811(PC-NCM)and SC-NCM during cycling are compared to analyze the most influential factors on the long cycle stability of high nickel ternary cathode materials.In this study,a new strategy for the synthesis of SC-NCM cathode materials by multi-step calcination method combining with ball milling method is proposed to accelerate the commercialization of NCM811.
single crystal NCM811cycling stabilitySC-NCM||graphite full cellmulti-step calcination method
万方数据
维普
