Fe3O4/C composite material, its preparation method and its application in lithium ion battery
A technology of ferric tetroxide and carbon composite materials, which is applied in the fields of nanotechnology, battery electrodes, and secondary batteries for materials and surface science, and can solve the problems of loose bonding of ferric tetroxide, reduced utilization of active materials, Problems such as poor material cycle stability, to achieve the effect of high yield, inhibit growth, and reduce agglomeration
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Embodiment 1
[0055] Preparation of ferric trioxide / carbon material: Mix and dissolve ferric chloride, sucrose and ammonia monohydrate with a molar ratio of 1:0.6:10 in an aqueous solution, and then add ferric chloride at a molar ratio of 1:100 The surfactant sodium stearate. Stir evenly at 70°C to obtain a suspension. The resulting suspension was spray-dried to collect the spray-dried powder. The obtained powder product was calcined in a nitrogen atmosphere at a temperature of 550° C. for 3 hours to obtain a porous Fe3O4 / carbon composite powder material.
[0056] The scanning electron microscope morphology of the composite powder material under different magnifications is as follows: figure 1 and figure 2 As shown in the figure, it can be seen that the ferric oxide / carbon monomer has a porous spherical structure, and the particle size is about 1-10 μm with good dispersion. From figure 2 It can be seen that the nano-particle phase is distributed in the carbon matrix, and the nano-par...
Embodiment 2
[0061] Preparation of ferric trioxide / carbon material: mix and dissolve ferric chloride, sucrose and ammonia monohydrate at a molar ratio of 1:1.2:10 in an aqueous solution, and then add ferric chloride at a molar ratio of 1:100 The surfactant sodium stearate. Stir evenly at 70°C to obtain a suspension. The resulting suspension was spray-dried to collect the spray-dried powder. Calcining the obtained powder product in a nitrogen atmosphere at a temperature of 550° C. for 3 hours, and grinding to obtain a porous Fe3O4 / carbon composite powder material.
[0062] The scanning electron microscope morphology of the composite powder material under different magnifications is as follows: Figure 4 and Figure 5 shown. Figure 4Visible porous massive crushed particles and a small amount of porous spherical particles. The particle size is about 0.2-50 μm. Figure 5 It can be seen that nanoparticles are distributed in the carbon matrix, and the nanoparticles are ferric oxide partic...
Embodiment 3
[0066] Preparation of ferric trioxide / carbon material: mix and dissolve ferric chloride, sucrose and ammonia monohydrate at a molar ratio of 1:0.6:10 in an aqueous solution, and then add ferric chloride at a molar ratio of 1:100 Surfactant sodium stearate. Graphite is added to the suspension for stirring, and the added graphite particles are flaky powders with a thickness of 0.5-2 μm and a size of 10-15 μm, accounting for 10% of the mass of the composite powder material. Stir evenly at 100°C to obtain a suspension. The resulting suspension was spray-dried to collect the spray-dried powder. The obtained powder product was calcined in an argon atmosphere at a temperature of 550° C. for 5 hours to obtain a porous Fe3O4 / carbon composite powder material.
[0067] The scanning electron microscope morphology of the composite powder material is as follows: Figure 10 As shown, flake graphite is evenly distributed in the middle of porous ferric oxide / carbon composite spherical parti...
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