Preparation method of magnetic carbon material

[0018] Ferrocene and red phosphorus are used as raw materials, and the two are uniformly mixed according to the mass ratio of 1.5:1, and then placed in a closed reactor with an oxygen content of 21% for heat treatment. The heating mechanism is as follows: firstly, the temperature is raised to 450°C at a rate of 3°C / min, and then the temperature is kept at a constant temperature for 4 hours, and then naturally cooled to room temperature. Open the kettle to take out the reaction product, heat it at a temperature of 50°C to initiate combustion, and the collected black fluffy combustion product is a magnetic carbon material. The material is used as the negative electrode material of the lithium ion battery, and the reversible capacity of 554 mAh / g can be maintained after 500 charge-discharge cycles at a current density of 100 mA / g.

[0020] Ferrocene and red phosphorus are used as raw materials, and the two are uniformly mixed according to the mass ratio of 0.5:1, and then placed in a closed reactor with an oxygen content of 5% for heat treatment. The heating mechanism is as follows: first, the temperature was raised to 400°C at a rate of 5°C / min, and then the temperature was kept at a constant temperature for 1 hour, and then naturally cooled to room temperature. Open the kettle to take out the reaction product, heat it at 40°C to initiate combustion, and the collected black fluffy combustion product is a magnetic carbon material. The material is used as the negative electrode material of the lithium ion battery, and the reversible capacity of 502 mAh / g can be maintained after 500 charge-discharge cycles at a current density of 100 mA / g.

[0022] Ferrocene and red phosphorus are used as raw materials, and the two are uniformly mixed according to the mass ratio of 2:1, and then placed in a closed reaction kettle with an oxygen content of 15% for heat treatment. The heating mechanism is as follows: first, the temperature is raised to 500°C at a rate of 2°C / min, and then the temperature is kept at a constant temperature for 4 hours, and then naturally cooled to room temperature. Open the kettle to take out the reaction product, heat it at 80°C to initiate combustion, and the collected black fluffy combustion product is a magnetic carbon material. The material is used as the negative electrode material of the lithium ion battery, and the reversible capacity of 529 mAh / g can be maintained after 500 charge-discharge cycles at a current density of 100 mA / g.