Graphitized negative electrode material prepared from graphitized waste material and preparation method of graphitized negative electrode material
A negative electrode material, graphite negative electrode technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of long process, unfriendly environment, and unfavorable industrial production.
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[0017] In order to achieve the above object, the present invention provides a preparation method of graphitized negative electrode material, the raw material of which is graphitized waste, the graphitized waste is crushed to a particle size of <5mm, and then pulverized, and the pulverized material is mixed with asphalt After coating, carbonization, screening, and demagnetization are carried out successively; wherein, the ratio of the pulverized material to the asphalt is 100:3-100:8 by mass percentage.
[0018] Wherein, the graphitized waste material is selected from one or more of crushed graphite, graphite joint powder, graphitized resistance material, crushed tailings of graphite negative electrode or crushed graphite crucible.
[0019] Wherein, the ash content of the graphitized waste is ≤0.3%, the volatile matter is ≤2%, and the fixed carbon content is ≥98%.
[0020] Wherein, the crushing step uses a hammer crusher for crushing, and the grinding step uses a roller mill fo...
Embodiment 1
[0033] (1) The graphitized waste of the recarburizing agent is crushed, and the test raw material is crushed to a particle size of <5mm by using a hammer crusher. 0.3%, volatile matter 2%, fixed carbon content 98%, graphitization degree 95%;
[0034] (2) Grinding: Use a roller press mill to grind the coarsely ground material, and the output indicators are: D10=6 μm, D50=14.5 μm, D90=25 μm, Dmax=45 μm;
[0035] (3) Coating: Use asphalt with a magnetic substance content of 0.6ppm and a softening point of 180°C as the coating binder. After grinding, the material: asphalt is fully mixed in the mixer according to the ratio of 100:6. Time 6h;
[0036] (4) Carbonization: Fill the uniformly mixed material into a graphite sagger, place it in a pusher kiln, and keep it at 1250° C. for 6 hours for carbonization.
[0037] (5) Screening and demagnetization: demagnetization. The prepared negative electrode material is A1.
Embodiment 2
[0039] The graphitized negative electrode material was produced according to the method in Example 1. The difference between this example and Example 1 is that the material after grinding: asphalt was coated at a ratio of 100:3. The prepared negative electrode material is A2.
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