Fast-charging high-first-effect hard carbon/artificial graphite negative electrode material and preparation method thereof
A technology of artificial graphite negative electrode and hard carbon, which is applied in the fields of carbon preparation/purification, negative electrode, chemical instruments and methods, etc., can solve the problem of insignificant increase in capacity, reduce irreversible capacity, ensure high first efficiency, and improve The effect of capacity
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Embodiment 1
[0029] This embodiment provides a method for preparing a fast-charging high-first-efficiency hard carbon / artificial graphite negative electrode material, including the following steps:
[0030] (1) 20kg ammonium dihydrogen phosphate is added to 70kg furfural phenol resin, disperse 40min with 2500r / m with disperser, solidify 5h in the air of 260 ℃, obtain pre-cured precursor; Crushed by a mill until D50=15μm powder, add 30kg of hexamethylenediamine curing agent to the powder, stir evenly, and cure in air at 230°C for 7 hours to obtain a cured precursor; put the cured precursor into a roller kiln, 2 Under the protection of the atmosphere, heat treatment at 700°C for 10 hours to obtain a hard carbon material;
[0031] (2) The hard carbon material is mechanically pulverized until D50 is 8 μm, and then it is mixed with pitch in a V-type mixer in a weight ratio of 90:10, and the mixture is placed in a roller kiln, N 2 Under the protection of the atmosphere, heat up to 1000°C and py...
Embodiment 2
[0034] This embodiment provides a method for preparing a fast-charging high-first-efficiency hard carbon / artificial graphite negative electrode material, including the following steps:
[0035] (1) Use a mechanical mill to pulverize the starch until D50 = 10 μm, put it into a rotary furnace, dry it at 250°C for 5 hours, cool it down to room temperature naturally, put it into a reaction kettle, N 2 Carbonize at 600°C for 5h under atmosphere protection, cool to room temperature, put into roller kiln, N 2 Heat treatment at 1200°C for 4 hours under atmosphere protection, and naturally cool to room temperature to obtain a hard carbon material;
[0036] (2) The hard carbon material is mechanically milled until D50 is 30 μm, then it is mixed with pitch in a V-type mixer in a weight ratio of 80:20, and the mixture is placed in a roller kiln, N 2 Under the protection of the atmosphere, the temperature was raised to 300°C for 3 hours, and the coated hard carbon material was obtained; ...
Embodiment 3
[0039] This embodiment provides a method for preparing a fast-charging high-first-efficiency hard carbon / artificial graphite negative electrode material, including the following steps:
[0040] (1) Mix 70kg of polyurethane and 22kg of furfuryl alcohol resin, add 22kg of tin chloride, use a disperser, disperse at 1000r / m for 2h, and cure in air at 160°C for 10h; grind it to D50=40μm with a mechanical mill; then place into the box-type resistance furnace, at N 2 Under the protection of the atmosphere, pyrolysis at 1500°C for 1 hour, and naturally cooled to room temperature to obtain hard carbon;
[0041] (2) The hard carbon material is mechanically pulverized until D50 is 20 μm, then it is mixed with pitch in a V-type mixer in a weight ratio of 50:50, and the mixture is placed in a roller kiln, N 2 Under the protection of the atmosphere, the temperature was raised to 650 ° C for 2 hours, and the coated hard carbon material was obtained;
[0042] (3) Put the coated hard carbon ...
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