MOF-based ZnO/NiO@C composites are used as anode materials for high performance lithium ion batteries
In this paper,MOF-derived ZnO/NiO@C porous nanocomposites were prepared by simple solvothermal method and calcination method,and their micromorphology and structure were charac-terized by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and X-ray diffraction(XRD),the elemental composition of the composites was analyzed by X-ray photoelectron spectroscopy(XPS),and the specific surface area and pore size distribution of the com-posites were tested by nitrogen adsorption/desorption experiments.The results show that the compos-ites have a high specific surface area and a certain number of mesopores.At 100 mA/g current den-sity,the specific capacity of ZnO/NiO@C electrode is 1 489.7 mAh/g for the first discharge,the re-versible capacity is 1 078.0 mAh/g after 400 cycles,and the capacity retention rate is 72.4％,in addi-tion,the specific capacity of the electrode can be restored to 75.28％of the initial magnification through the charge-discharge experiment of different magnifications,and the test results show that the ZnO/NiO@C electrode has excellent cycling performance and good rate performance.The fa-vourable electrochemical performance can be attributed to the material's porous structure,high spe-cific surface area and abundance of electrochemically active sites.These characteristics reduce the re-sistance to charge transfer,facilitate ion diffusion and improve the material's multiplicity perfor-mance and cycling stability.
lithium ion batteriesanode materialMOFmetal organic skeletonporous structure
万方数据
维普
