| With the development of society,the depletion of fossil energy has become increasingly urgent.In the process of energy storage and development,the advantages of lithium-ion batteries are increasingly prominent and become a hot spot of scholars.It is the key to find electrode materials with higher energy density in modern research.The anode material CoS1.097 was prepared by solvothermal method using CoCl2·6H2O and CH4N2 S as the cobalt source and sulfur source.The CoS1.097 anode materials was modified by changing process parameters and composite carbon source types（CNTs and glucose）.Co-MOFs precursors were prepared by Co（NO3）2·6H2O and terephthalic acid（C8H6O4）as cobalt source and organic ligand,and the Co9S8@C anode material was prepared by adding sulfur powder and changing process parameters.The phase composition and microstructure of the cobalt sulfide-based anode materials were characterized by XRD,SEM,TEM and laser Raman spectroscopy,respectively.The electrochemical performance of the electrochemical workstation and the blue electric test system were tested.The pure phase CoS1.097 prepared by solvothermal method with molar ratio of cobalt to sulfur of 1:2.5,reaction temperature of 180 °C and reaction time of 12 h has better electrochemical performance.CoS1.097/CNTs anode material prepared when the mass percentage of composite CNTs is 10 wt% has a stable specific capacity of 140 mAh·g-1 after 100 cycles at 100 m A·g-1.Co1-x S/C anode material has excellent performance when the concentration of glucose is 0.05 M.At a current density of 100 m A·g-1,the discharge specific capacity of the anode material is stabilized at 175 mAh·g-1 after 100 cycles;when the molar ratio of Co（NO3）2·6H2O to C8H6O4 is 1:3,Co9S8@C anode material prepared by 600 °C and 2 h has the best performance.The first discharge specific capacity is up to 1048.6 mAh?g-1,and the capacity decay is 1035.4 mAh?g-1 after 100 cycles at 50 m A·g-1.,the capacity retention rate is 98.74%.Figure 63;Table 7;Reference 65... |
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