Mixing process for preparing high-tap-density microcrystalline graphite negative electrode material
A technology of microcrystalline graphite and negative electrode material, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of poor filling effect and low powder tap density, and achieve improved tap density and ideal specific surface area. Effect
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Embodiment 1
[0024] 200kg of microcrystalline graphite and 20kg of petroleum pitch with a particle size of 3μm and a softening point of 250°C were initially mixed with high-speed VC. The particle size of the microcrystalline graphite used was 10-15μm, the initial mixing time was 20-60min, and the stirring speed was 200-300rpm. Then transfer the mixture into a high-speed kneader, turn on the condensed water and pass in nitrogen gas, at room temperature, rotate and extrude microcrystalline graphite and petroleum pitch, stir at 1000-2000rpm for 3-6min, and achieve rotor alignment by changing the diameter of the stator. Extrusion and kneading of materials. The inert gas includes but is not limited to nitrogen, argon, helium and other gases that do not react with pitch and carbon materials at high temperatures, and nitrogen gas is preferred. Next, turn off the condensed water, turn on the electric heating system, raise the temperature to 350-450°C, rotate and extrude the mixture, adjust the spe...
Embodiment 2
[0026] 200kg of microcrystalline graphite and 30kg of petroleum pitch with a particle size of 5 μm and a softening point of 250°C were initially mixed with high-speed VC. The particle size of the microcrystalline graphite used was 10-15 μm. The initial mixing time was 60 minutes and the stirring speed was 300 rpm. Then transfer the mixture into a high-speed kneader, turn on the condensed water and pass in nitrogen gas, and rotate and extrude the microcrystalline graphite and petroleum pitch at room temperature, stir at 2000rpm for 6 minutes, and realize the extruding of the rotor to the material by changing the diameter of the stator Knead. Use cooling water to cool the sample chamber of the high-speed kneading equipment, so that the rotary extrusion is carried out at a temperature of 30°C. The rotary extrusion is carried out under the protection of an inert gas. The time of the rotary extrusion is 6 minutes; the rotation speed is 1000rpm . The inert gas includes but is not l...
Embodiment 3
[0029] 200kg of microcrystalline graphite and 20kg of coal tar pitch with a particle size of 3μm and a softening point of 220°C were initially mixed with high-speed VC. The particle size of the microcrystalline graphite used was 10-15μm, the initial mixing time was 40min, and the stirring speed was 260rpm. Then transfer the mixture into a high-speed kneader, turn on the condensed water and pass in nitrogen gas, and rotate and extrude the microcrystalline graphite and petroleum pitch at room temperature, stir at 1500rpm for 5 minutes, and realize the extruding of the rotor to the material by changing the diameter of the stator Knead. The inert gas includes but is not limited to nitrogen, argon, helium and other gases that do not react with pitch and carbon materials at high temperatures, and nitrogen gas is preferred.
[0030] Next, turn off the condensed water, turn on the electric heating system, raise the temperature to 400°C, and rotate and extrude the mixture. After the te...
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