Artificial composite graphite negative electrode material, lithium ion battery, preparation method and application
A technology of composite graphite and negative electrode materials, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of low compaction density and low discharge capacity, and achieve high compaction density, good electrochemical performance, and adaptability good sex effect
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Embodiment 1
[0048] Petroleum asphalt is crushed to less than 0.1 mm, and 60 kg of anthracite powder (D50 is 19.1 μm), 140 kg of needle coke green coke powder (D50 is 15.4 μm) and graphitization catalyst (SiO 2 ) 16kg, mixed evenly, mixed with pitch powder 60kg in a kneading pot, and kneaded for 1 hour at 160°C. After the kneading was completed, it was pressed into a sheet (4mm) in a tablet machine, and crushed into particles with a particle size of less than 100 μm. Briquetting is formed. Under the protection of nitrogen, carbonize at 1100°C for 2 hours, then cool the reaction product to room temperature, and then carry out catalytic graphitization high-temperature treatment at 2800°C for 36 hours to obtain an artificial particle size D50 of 17.8 μm The composite graphite anode material has a half-battery capacity of 362.5mAh / g and an initial efficiency of 92.8%.
[0049] It has been found through research that the particle size of anthracite powder has a great influence on the compacted...
Embodiment 2
[0051] Crush the petroleum pitch to below 0.1mm, add 80kg of anthracite powder (D50 is 19.5μm), 120kg of needle coke green coke powder (D50 is 15.4μm) and 6kg of graphitization catalyst (SiC) alternately under stirring, and mix evenly with 20kg of asphalt powder Mix in a kneading pot, carry out kneading treatment at 160°C for 1 hour, after the kneading is completed, press into a tablet shape (3 mm) in a tablet press, crush into particles with a particle size of less than 100 μm, and briquette. Under the protection of nitrogen, carbonize at 800°C for 6 hours, then cool the reaction product to room temperature, and then carry out high-temperature catalytic graphitization at 3000°C for 48 hours to obtain artificial composites with a particle size D50 of 18.3 μm. Graphite anode material, its half-battery capacity is 363.1mAh / g, and the first-time efficiency is 93.2%.
Embodiment 3
[0053] Coal tar pitch is pulverized to less than 0.1 mm, and 100 kg of anthracite powder (D50 is 20.1 μm), 100 kg of needle coke raw coke powder (D50 is 19.8 μm) and graphitization catalyst (SiO 2 ) 10kg mixed evenly, mixed with pitch powder 40kg in a kneading pot, kneaded at 160°C for 1 hour, after the kneading was finished, pressed into flakes (5mm) in a tablet machine, and crushed into particles with a particle size of less than 100 μm. Briquetting is formed. Under the protection of nitrogen, carbonize at 1500°C for 3 hours, then cool the reaction product to room temperature, and then carry out high-temperature catalytic graphitization at 3200°C for 48 hours to obtain artificial composites with a particle size D50 of 17.4 μm. Graphite negative electrode material, its half-cell capacity is 365.0mAh / g, and the first-time efficiency is 92.6%.
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