Preparation method for graphite negative electrode of lithium ion battery
A lithium-ion battery, graphite anode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the material capacity, efficiency or cycle performance cannot meet the requirements of use, expensive equipment, and high production costs, and achieve industrial operability. The effect of improving the strength, capacity and efficiency, and reducing the preparation cost
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[0035] Example 1
[0036] Weigh 70g of water-based phenolic resin (Tianjin Resin Factory 216-4#), 1330g of deionized water, and fully stir to dissolve in the dispersion equipment. The temperature of the water bath is 90°C and the stirring speed is 80Hz.
[0037] Weigh 55.6g of aluminum nitrate and 7.8g of alpha-type aluminum oxide with a particle size of 0.5 micron into the dispersing equipment, rotate at 900 rpm to fully disperse, add 1000g of spherical natural graphite with a particle size of 7 microns, fully stir, impregnate and evaporate. Dry at 150℃ for 24h.
[0038] After passing the 400-mesh sieve, the obtained powder is placed in an argon furnace for roasting. The roasting formula is: 5°C / min to 600°C for curing for 6 hours, then 5°C / min to 850°C for carbonization, and holding for 10 hours. Cool with the furnace.
[0039] According to the analysis of electron microscope photos: the surface of natural graphite is covered with a layer of pyrolytic carbon and aluminum oxide, and...
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[0041] Example 2
[0042] Weigh 100g of water-based phenolic resin (Tianjin Resin Factory 216-4#), 1000g of deionized water, and fully stir to dissolve in the dispersion equipment, the temperature of the water bath is 40°C, and the stirring speed is 70Hz.
[0043] Weigh 13.2g of α-type aluminum oxide with a particle size of 0.5 microns and add it to the dispersing device at a speed of 1200 rpm to fully disperse it. Add 1000g of artificial graphite with a particle size of 9 microns, fully stir, impregnate and evaporate, and dry at 80°C for 24 hours. After passing the 200-mesh sieve, the powder is placed in an argon furnace for roasting. The roasting formula is: 5°C / min to 550°C for 6 hours, then 3°C / min to 1050°C for carbonization, and heat preservation for 6 hours. Cool with the furnace.
[0044] According to the analysis of electron microscope photos: the graphite surface is covered with a layer of pyrolytic carbon and aluminum oxide, and its microscopic morphology has not changed ...
Example Embodiment
[0045] Example 3
[0046] Weigh 50g of water-based phenolic resin (Tianjin Resin Factory 216-2#), 250g of deionized water, and fully stir to dissolve in the dispersion equipment, the temperature of the water bath is 70°C, and the stirring speed is 120Hz.
[0047] Weigh 14.8 g of aluminum chloride and add it to the dispersing equipment at a speed of 200 rpm to fully disperse and dissolve, add 1000 g of natural graphite with a particle size of 7 microns, fully stir, impregnate and evaporate, and dry at 200°C for 16 hours. After passing through a 500-mesh sieve, the powder is placed in a nitrogen furnace for roasting. The roasting formula is: 3°C / min to 400°C for 8 hours, then 3°C / min to 950°C for carbonization, and heat preservation for 8 hours. The furnace cools.
[0048] According to the analysis of electron microscope photos, the graphite surface is covered with a layer of pyrolytic carbon and aluminum oxide, and its microscopic morphology has not changed before and after modificat...
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