A process of mesophase pitch side contact coating graphite
A mesophase pitch, contact technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of unfavorable rapid insertion and extraction of lithium ions, no literature and patent reports, etc., and achieve a significant improvement in fast charging performance. , the effect is obvious
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Embodiment 1
[0027] Add 1KG of artificial graphite and 1000ml of polytetrafluoroethylene emulsion with a solid content of 1.2% into a kneading pot for kneading. Then, under a nitrogen atmosphere, the temperature of the kneading pot was raised to 250° C., and the kneading was continued. After the solvent was dried, the kneading was stopped, and the modified graphite material was obtained by natural cooling.
[0028] Mix the modified graphite material and the mesophase pitch with a VC machine at a mass ratio of 100:0.5, and then raise the temperature to 450°C at a rate of 0.5°C / min in a nitrogen atmosphere, keep it warm for 1 hour, and then increase the temperature at a rate of 2°C / min. Raise the temperature to 900°C, keep it warm for 0.5h, and then cool it down naturally. The obtained material is named 1#. Among them, the quinoline insoluble content of the mesophase pitch is 86%, the softening point is 252°C, and the coking value is 84.2%.
Embodiment 2
[0030] 3KG of A and 4500ml of polytetrafluoroethylene emulsion with a solid content of 1.8% were uniformly mixed and added to a kneading pot for kneading. Wherein, the artificial graphite is a graphitized product of secondary particles prepared from petroleum coke raw coke. Then, the temperature was raised to 300° C. under an argon atmosphere, and the solvent was evaporated to obtain a modified graphite material.
[0031] The modified graphite material and mesophase pitch were mixed by a VC machine at a mass ratio of 100:1, and then in a nitrogen atmosphere, the temperature was first raised to 450°C at a rate of 1°C / min, kept for 2 hours, and then heated at a rate of 3°C / min. Raise the temperature to 1100°C, keep it warm for 0.5h, and then cool it down naturally. The obtained material is named 2#. Among them, the content of quinoline insolubles in the mesophase pitch is 89%, the softening point is 285°C, and the coking value is 82%.
Embodiment 3
[0033] Mix 2KG of A with 1000ml of polytetrafluoroethylene emulsion with a solid content of 2.4%, and add it to the kneading pot for kneading. Wherein, the artificial graphite is a graphitized product of secondary particles prepared from petroleum coke raw coke. Then, the temperature was raised to 350° C. under a nitrogen atmosphere, and the solvent was evaporated to obtain a modified graphite material.
[0034] The modified graphite material and the mesophase pitch were mixed by a VC machine at a mass ratio of 100:2. The content of quinoline insolubles in the mesophase pitch was 85%, the softening point was 288°C, and the coking value was 81%. Then, under an argon atmosphere, first raise the temperature to 400°C at a speed of 1.5°C / min, and then heat it up to 1350°C at a speed of 5°C / min after holding for 3 hours. After holding for 1 hour, cool naturally, and the obtained material is named 3#.
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