Preparation method for negative electrode material of lithium-ion battery
A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low coulombic efficiency and poor conductivity, and achieve improved conductivity, cycle performance, and first charge and discharge coulomb efficiency effect
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[0024] Example 1
[0025] The method for preparing a negative electrode material for a lithium ion battery provided in this embodiment includes the following steps: the fine powder of artificial graphite waste with a particle size of 1 μm-15 μm, SiO particles with a particle size of 1 μm-30 μm and sucrose according to 7:8: The mass ratio of 1 is ball milled to obtain a mixed powder, and then the mixed powder is mixed with urea, specifically, the urea is dissolved in water to obtain a urea solution with a concentration of 0.3 mol / L, and then the mixed powder is added to the urea Surface adsorption is carried out in the solution. The adsorption lasts for 30 minutes. Ultrasonic disturbance is applied during the entire adsorption process. After the adsorption is completed, take out the mixed powder and dry the mixed powder. The drying temperature is 60℃ and the drying duration is 1h to remove moisture, and then perform high-temperature nitridation treatment under a nitrogen atmospher...
Example Embodiment
[0026] Example 2
[0027] The method for preparing a negative electrode material for a lithium ion battery provided in this embodiment includes the following steps: the fine powder of artificial graphite waste with a particle size of 1 μm-15 μm, SiO particles with a particle size of 2 μm-40 μm and glucose according to 5:7: The mass ratio of 0.7 is ball milled and mixed to obtain a mixed powder, and then the mixed powder is mixed with melamine, specifically, the melamine is dissolved in water to obtain a melamine solution with a concentration of 0.1 mol / L, and then the mixed powder is added to the melamine Surface adsorption is carried out in the solution. The adsorption lasts for 1 hour. Stirring is applied during the entire adsorption process. After the adsorption is completed, take out the mixed powder and dry the mixed powder. The drying temperature is 80°C and the drying duration is 40 minutes. , In order to remove moisture, and then high-temperature nitriding treatment in an...
Example Embodiment
[0028] Example 3
[0029] The method for preparing a negative electrode material for a lithium ion battery provided in this embodiment includes the following steps: the fine powder of artificial graphite waste with a particle diameter of 1 μm-15 μm, SiO particles with a particle diameter of 0.2 μm-20 μm, and citric acid according to 9: 4: 0.9 mass ratio of ball milling and mixing to obtain a mixed powder, and then the mixed powder and N-methylpyrrolidone are mixed, specifically, N-methylpyrrolidone is dissolved in water to obtain a concentration of 0.9mol / L N -Methylpyrrolidone solution, and then add the mixed powder to the N-methylpyrrolidone solution for surface adsorption. The adsorption lasts for 10min. Ultrasonic disturbance is applied during the entire adsorption process. After the adsorption is completed, the mixed powder The mixed powder is dried at a drying temperature of 70°C and a drying duration of 40 minutes to remove moisture, and then subjected to high-temperature ...
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