Nitrogen-doped high-capacity hard carbon negative electrode material and preparation method thereof
A negative electrode material, nitrogen doping technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of low specific capacity, low compaction density of hard carbon, low energy density, etc., to improve energy density, improve The effect of compaction density and simple preparation process
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[0024] A method for preparing a nitrogen-doped high-capacity hard carbon negative electrode material, comprising the steps of:
[0025] (1) Pour the tar into the reaction kettle, feed in the air and heat while stirring, the heating time is 4 to 10 hours, after cooling down to room temperature, pour it out to obtain the modified tar;
[0026] (2) Take the modified tar and mix it with a nitrogen source, and mix it evenly to obtain a mixed solution. Put the mixed solution into a chamber furnace for pre-carbonization treatment under the protection of an inert gas. After the temperature of the chamber furnace drops to room temperature, take it out to obtain a pre-carbonized Carbide, pulverize the pre-carbide with a jet mill;
[0027] (3) Under the protection of inert gas, use a tube furnace to carbonize the pulverized pre-carbide at a temperature of 800-1100 ° C. After the temperature of the tube furnace drops to room temperature, the first-order nitrogen-doped hard carbide can be ...
Embodiment 1
[0039] Pour 50kg of coal tar with 10% carbon residue into the reaction kettle, feed air with a flow rate of 2L / min, heat while stirring at a speed of 300rpm / min, raise it to 250°C, and keep it at 250°C for 4 hours After the temperature drops to room temperature, it can be poured out to obtain modified coal tar. Take 3kg of modified coal tar and add 120g of ammonia water with an ammonia content of 25% in a ratio of 100 / 4. After mixing evenly, a mixed solution is obtained, and the mixed solution is put Put it into the box furnace, under the protection of nitrogen gas flow rate of 1L / min, carry out pre-carbonization treatment at 400 ° C, pre-carbonize at 400 ° C for 1 hour, after the temperature of the box furnace drops to room temperature, take it out to obtain the pre-carbonized drive body , the pre-carbide was crushed with a jet mill to obtain a hard carbon precursor. The average volume particle size after crushing was 5 μm. Carry out carbonization at a temperature of 800°C, a...
Embodiment 2
[0041]Pour 50kg of coal tar with 30% carbon residue into the reaction kettle, feed air with a flow rate of 3L / min, heat while stirring at a speed of 500rpm / min, raise it to 400°C, and keep it at 400°C for 7 hours After the temperature drops to room temperature, it can be poured out to obtain modified coal tar. Take 3kg of modified coal tar and add 180g of ammonia water with an ammonia content of 25% in a ratio of 100 / 6. After mixing evenly, a mixed solution is obtained, and the mixed solution is put Put it into the chamber furnace, under the protection of nitrogen gas flow rate of 5L / min, carry out pre-carbonization treatment at 700°C, pre-carbonize at 700°C for 3 hours, and take out the pre-carbonized body after the temperature of the chamber furnace drops to room temperature. The pre-carbide was pulverized with a jet mill to obtain a hard carbon precursor. The average volume particle size after pulverization was 10 μm. The carbonization is carried out at a temperature of ℃, ...
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