Method for preparing natural graphite cathode material of lithium ion battery by wet ball milling
A lithium-ion battery and natural graphite technology, which is applied in the field of wet ball milling to prepare natural graphite anode materials for lithium-ion batteries, can solve problems such as difficulty in ensuring stable product batches, low raw material utilization, and general product appearance, and achieves a preparation method Environmental protection, high raw material utilization rate, and excellent comprehensive performance
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Embodiment 1
[0024] 100Kg of natural flake graphite (with a particle size of about 3mm and a fixed carbon content of 97%) was crushed by a pulverizer to obtain 94.3Kg of negative electrode material intermediates with a particle size of D10 of 10.56 μm and a D99 of 36.71 μm, which were irregular in shape, and were stirred in a ball mill ( 500L), add 200 kg of water and 200 kg of grinding balls, start stirring at low speed, then add 1 kg of dispersant sodium dodecylbenzene sulfonate and polyvinyl alcohol, and finally pour the intermediate product of the negative electrode material into the mixer, start stirring at high speed, The rotation speed is 240rpm, and the stirring is stopped after 90 minutes. The slurry is centrifuged with a scraper centrifuge, and most of the water is removed to obtain a negative electrode active material containing a small amount of water, and then a cyclone separator is used. The drying device dries it and separates the fine powder in it to obtain 75.2Kg of the fin...
Embodiment 2
[0026] 100 Kg of natural flake microcrystalline graphite (with a particle size of about 1.5cm and a fixed carbon content of 95%) was crushed by a pulverizer to obtain a negative electrode material intermediate with a particle size D10 of 7.43 μm and a D99 of 26.37 μm in irregular shape. (500L) Add 200 kg of water and 180 kg of grinding balls, start stirring at low speed, then add 1.5 kg of sodium hydroxymethyl cellulose as a dispersant, and finally add the intermediate product of the negative electrode material into the blender, start stirring at high speed at 280rpm for 120 minutes Finally, the stirring is stopped, and the slurry is subjected to pressure filtration treatment with a plate and frame filter press, and most of the water is removed to obtain a negative electrode active material containing a small amount of water, and then a drying device with a cyclone separator is used Dry it and separate the fine powder in it to obtain 71.4Kg of the finished lithium battery negat...
Embodiment 3
[0028] 100 kg of natural microcrystalline graphite (with a particle size of about 1mm) was crushed by a pulverizer to obtain a negative electrode material intermediate with a particle size of D10 of 11.96 μm and D99 of 38.27 μm in irregular shape. Add 210 kg of water and 200 kg of grinding balls, start low-speed stirring, then add 1 kg of dispersant sodium hydroxymethyl cellulose, and finally add the intermediate product of the negative electrode material into the mixer, start high-speed stirring at a speed of 300rpm, stop stirring after 120 minutes, and use a plate The frame-type filter press is used for pressure filtration, and then the drying device with a cyclone separator is used to dry it and separate the fine powder in it to obtain 72.1Kg of the finished lithium battery negative electrode material, and the yield of the finished product reaches 72.1%.
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