Nanometer composite negative material and preparation method and application thereof
A negative electrode material, nanocomposite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low capacity and low cycle stability of silicon-based negative electrode materials, and can reach the synthesis scale. Amplification, high mechanical strength, good ion conductivity
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Embodiment 1
[0062] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:
[0063] The first step, asphaltene adsorption: add 50mg of silicon powder with a diameter of 100nm to 100ml of 1.0g / L toluene solution of asphaltene molecules, and mechanically stir for 12 hours to drive the asphaltene molecules to the surface of the core material.
[0064] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.
[0065] The third step, high-temperature treatment: put the asphaltene-coated silicon powder in a heated quartz tube, and under the protection of an inert gas, first raise the temperature at 5°C per minute to 100°C, keep it warm for 10 minutes, and then heat it at 5°C / min The heating rate was raised to 800° C., kept for 1 h, and cooled to room temperature to obtain the asphaltene adsorption l...
Embodiment 2
[0069] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:
[0070] The first step, solvent transition method: add 50mg of silicon powder with an average diameter of 100nm to the toluene solution of 1.0g / l asphaltene molecules, and slowly drop a certain amount of methanol solution, so that the final volume ratio of toluene and methanol is 8:2 , stirred for 12 hours, driving the first layer of asphaltene molecules to the surface of the core material. After 12 hours, slowly drop a certain amount of heptane, so that the final volume ratio of the mixed solution of heptane, toluene and methanol is 8:2, and drive the second layer of asphaltene molecules to the surface of the first layer of asphaltene molecules.
[0071] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.
[007...
Embodiment 3
[0076] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:
[0077] The first step, asphaltene adsorption: add 50mg of silicon powder with a diameter of 100nm to 100ml of 1.0g / L toluene solution of asphaltene molecules, and stir for 12 hours to drive the asphaltene molecules to the surface of the core material.
[0078] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.
[0079] The third step, high-temperature treatment: put the asphaltene-coated silicon powder in a heated quartz tube, and under the protection of an inert gas, first raise the temperature at 5°C per minute to 100°C, keep it warm for 10 minutes, and then heat it at 5°C / min The heating rate was raised to 600° C., kept for 1 h, and cooled to room temperature to obtain a high-temperature treated asphaltene ad...
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