Preparation method and preparation device of coal pitch-based hard carbon negative electrode material

• Main Author: YU BINGWU
• Format: Patent
• Language: Chinese; English
• Published: 14.10.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to the technical field of battery electrode preparation, and discloses a preparation method and a preparation device of a coal pitch-based hard carbon negative electrode material, coal pitch is used as a precursor, and the preparation method comprises the following steps: S1, medium-temperature pitch is distilled for 0.5-2 h by using a molecular distillation method to prepare low-QI coal pitch; s2, under the condition of 200-300 DEG C, air is used as an oxidizing agent to conduct oxidation treatment on the low-QI coal pitch, and the oxidation time is 4-12 h; s3, crushing: crushing and sieving the high-softening-point asphalt to obtain asphalt powder; and crushing the high-softening-point asphalt until the diameter is 1-3 microns, uniformly mixing the high-softening-point asphalt with the hard carbon matrix, and carbonizing in a nitrogen protective atmosphere reaction furnace at the carbonization temperature of 1000-1200 DEG C to finish coating, thereby finally obtaining the hard carbon n