A three-dimensional graphene-based iron oxide composite material and its preparation and application
A composite material and graphene-based technology, applied in the field of materials science and electrochemistry, can solve the problems affecting the electrochemical performance of lithium-ion batteries, low utilization rate of active metal oxides, unfavorable sufficient, fast electrochemistry, etc., to achieve rich stress Buffering nano space, excellent electrochemical performance, and the effect of improving electrochemical performance
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Embodiment 1
[0032] The preparation process of the three-dimensional graphene-based iron oxide composite is as follows:
[0033] The first step, preparation of graphene-based Prussian blue composite material:
[0034] (1) Dissolving potassium ferrocyanide with a concentration of 0.5M of 2.25mL into a graphene oxide solution of 2mg / mL at a concentration of 15mL;
[0035] (2) Add 15mL of deionized water to the solution, then add 2.7g of ferric chloride to the solution, and stir it evenly;
[0036] (3) Pour the solution into the glass lining of the reaction kettle, conduct a hydrothermal reaction at a temperature of 180-220° C. for 12-24 hours, and soak and wash the obtained airgel in deionized water.
[0037] The second step, preparation of three-dimensional graphene-based iron oxide composite material:
[0038] (1) Put the obtained airgel material into a tube furnace, carry out high-temperature carbonization in an air atmosphere, and keep the temperature at 250-300°C for 3-4 hours, and fi...
Embodiment 2
[0047] A graphene-based iron oxide composite material with a three-dimensional structure for lithium-ion battery negative electrode materials, the preparation method of which comprises the following steps:
[0048] 1) Mix the potassium ferrocyanide solution with a concentration of 0.4mol / L and the graphene oxide solution with a concentration of 2.5mg / mL, and then add water to obtain a mixed solution; wherein, the potassium ferrocyanide solution and graphene oxide The volume ratio of the solution is 1:5, and the volume ratio of water and graphene oxide solution is 1.2:1.
[0049] 2) Add ferric chloride to the mixed solution, and add 5 g of ferric chloride to every 100 mL of the mixed solution, and then conduct a hydrothermal reaction at a temperature of 220 ° C for 12 hours to obtain an airgel;
[0050] 3) After immersing the airgel in water, washing and freeze-drying, it was subjected to high-temperature carbonization at 300° C. for 3 hours in an air atmosphere to obtain a com...
Embodiment 3
[0052] A graphene-based iron oxide composite material with a three-dimensional structure for lithium-ion battery negative electrode materials, the preparation method of which comprises the following steps:
[0053] 1) Mix the potassium ferrocyanide solution with a concentration of 0.6mol / L and the graphene oxide solution with a concentration of 1.5mg / mL, and then add water to obtain a mixed solution; wherein, the potassium ferrocyanide solution and graphene oxide The volume ratio of the solution is 1:8, and the volume ratio of water and graphene oxide solution is 0.8:1.
[0054] 2) Add ferric chloride to the mixed solution, and add 10g of ferric chloride to every 100mL of the mixed solution, and then conduct a hydrothermal reaction at a temperature of 180°C for 24 hours to obtain an airgel;
[0055] 3) Soak the airgel in water, wash and freeze-dry, and then carry out high-temperature carbonization at 250° C. for 4 hours in an air atmosphere to obtain a composite material.
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