A high-performance microcrystalline graphite negative electrode material and its low-cost preparation method
A technology of microcrystalline graphite and negative electrode material, applied in chemical instruments and methods, battery electrodes, carbon compounds, etc., can solve the problem of low tap density and fixed carbon content, high irreversible capacity loss, and unsatisfactory cycle performance, etc. problem, to achieve the effect of high carbon residue rate, avoiding purification treatment, and high degree of graphitization
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[0023] The invention discloses a low-cost preparation method of high-performance microcrystalline graphite negative electrode material, comprising the following steps:
[0024] (1) Crushing and shaping: After initial flotation, the microcrystalline graphite with fixed carbon content ≥90% is crushed by mechanical grinding and then put into a stirring ball mill, adding grinding aids, and stirring and grinding. After grinding, the materials are dried, and then air-selected. Grading to obtain microcrystalline graphite microspheres with a particle size D50=5-15μm with smooth surface, smooth surface and no floating powder;
[0025] The mechanical grinding pulverization refers to the use of ultra-fine mechanical grinding to pulverize the concentrate dry material obtained after preliminary flotation to obtain microcrystalline graphite fine powder with a particle size of D50=5-25 μm.
[0026] Described grinding, the grinding ball that adopts is agate ball, diameter 5-10mm, slurry conce...
Embodiment 1
[0033] A low-cost preparation method of a high-performance microcrystalline graphite negative electrode material, comprising the following steps:
[0034] (1) Crushing and shaping: The microcrystalline graphite with a fixed carbon content of 91% after initial flotation is crushed by mechanical grinding and then put into a stirring ball mill, adding grinding aids, and stirring and grinding. After grinding, the materials are dried and then air-selected. Grading to obtain microcrystalline graphite microspheres with a particle size D50=12μm with smooth surface, smooth surface and no floating powder;
[0035] The mechanical grinding pulverization refers to the use of ultrafine mechanical grinding to pulverize the concentrate dry material obtained after preliminary flotation to obtain microcrystalline graphite fine powder with a particle size of D50=14 μm.
[0036] For the grinding, the grinding balls used are agate balls with a diameter of 5 mm and a slurry concentration of 10%; th...
Embodiment 2
[0042] A low-cost preparation method of a high-performance microcrystalline graphite negative electrode material, comprising the following steps:
[0043] (1) Crushing and shaping: The microcrystalline graphite with a fixed carbon content of 93% after initial flotation is crushed by mechanical grinding and then put into a stirring ball mill, adding grinding aids, and grinding by stirring. After grinding, the materials are dried, and then air-selected Grading to obtain microcrystalline graphite microspheres with a particle size D50=14μm with smooth surface, smooth surface and no floating powder;
[0044] The mechanical grinding pulverization refers to the use of ultrafine mechanical grinding to pulverize the concentrate dry material obtained after preliminary flotation to obtain microcrystalline graphite fine powder with a particle size of D50=16 μm. For the grinding, the grinding balls used are agate balls with a diameter of 10 mm and a slurry concentration of 20%; the mass ra...
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