Preparation method of spherical silicon-carbon negative electrode material for lithium ion battery
A technology for carbon negative electrode materials and lithium-ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of rapid capacity decay of lithium batteries and poor structural stability of composite materials, and achieve improved cycle stability, stable material structure, The effect of extending the service life
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Embodiment 1
[0026] (1) get median diameter D50=20um, the phosphorus sheet graphite 1kg of carbon content 99.0%, be placed in the drum furnace with heating function, pass into water vapor, water vapor flow rate 0.8ml / min; The temperature was raised to 500°C in min, and the temperature was kept constant for 1 hour. After the end of the constant temperature, the temperature was naturally lowered to obtain the phosphorus flake graphite material A whose surface had been hydroxylated;
[0027] (2) Take 1 kg of nano-silicon powder with a median particle size of D50=150nm and a purity of 99.9%, place it in a roller furnace with heating function, feed water vapor, and the water vapor flow rate is 0.5ml / min; Raise the temperature to 700°C, keep the temperature constant for 1 hour, after the constant temperature is over, lower the temperature naturally, and obtain nano-silicon powder B whose surface has been hydroxylated;
[0028] (3) Get 0.5kg hydroxylated phosphorus flake graphite material A, disp...
Embodiment 2
[0041] Steps (1)-(8) are the same as in Example 1;
[0042] Step (9): Select 7um spheroidized material, mix and coat it with low-temperature asphalt, the method is the same as in Example 1; the subsequent steps of coating, carbonization, and screening are all the same as in Example 1; the median particle size of the undersize material after carbonization D50=8.5um, used for power supply performance test of undersize material.
[0043] The electrochemical performance test is the same as in Example 1.
Embodiment 3
[0045] (1) get median diameter D50=5um, 2kg of phosphorus flake graphite of carbon content 99.0%, be placed in the drum furnace with heating function, pass into water vapor, water vapor flow rate 0.5ml / min; The temperature was raised to 200°C in min, and the temperature was kept constant for 0.5h. After the end of the constant temperature, the temperature was naturally lowered to obtain the phosphorus flake graphite material A whose surface had been hydroxylated;
[0046] (2) Take 1 kg of nano-scale silicon powder with a median particle size of D50=30nm and a purity of 99.9%, place it in a roller furnace with heating function, feed water vapor, and the water vapor flow rate is 0.2ml / min; The temperature was raised to 500°C in min, and the temperature was kept constant for 0.5h. After the constant temperature was completed, the temperature was naturally lowered to obtain nano-silicon powder B whose surface had been hydroxylated;
[0047] (3) Get 0.5kg hydroxylated phosphorus fl...
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