Lithium-rich manganese-based cathode material Li1.2Mn0.54Ni0.13Co0.13O2 was prepared by co-pre-cipitation,sol-gel,and solid phase methods,and the phase composition and microstructure of the synthe-sized material were characterized by XRD,SEM,EDS,etc.The electrochemical performance of the CR2032 button type half cell assembled from the synthesized material was tested using a battery testing system.The results indicate that lithium-rich manganese-based cathode materials with a layered structure have been successfully synthesized by the three synthesis methods.Among them,the sample prepared by co-pre-cipitation method exhibits the lowest degree of cation mixing,and has uniform elemental distribution and particle size,clear grain boundary edges,and no obvious agglomeration.In terms of electrochemical per-formance,the first cycle discharge specific capacity of the sample synthesized by co-precipitation method at a rate of 0.1 C reaches the highest within the voltage range of 2.0～4.8 V.Moreover,after 100 cycles,the prepared sample still maintains a discharge specific capacity of 195.8 mA·h/g,with a capacity retention rate of 87.3％.Comparatively,the samples prepared by sol-gel method and solid phase method has lower capacity retention rates of only 84.5％and 83.8％,respectively.And compared with the samples prepared by sol-gel method and solid phase method,the co-precipitation method can effectively improve the Li+transport efficiency of Li1.2Mn0.54Ni0.13Co0.13O2 cathode material,thereby improving the rate performance of the sample.
万方数据