Hard carbon-coated graphite negative electrode material, lithium ion battery, and preparation method and application thereof
A graphite negative electrode and coating technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as uneven coating, high production cost, and particle adhesion, and achieve excellent cycle performance, low cost, and meet The effect of high capacity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0043] Put composite granular artificial graphite (D50=15 μm) and medium-temperature petroleum pitch powder (D50=5 μm) into the mixer according to the mass ratio of 100:12 and mix for 30 minutes. 2°C / min to 300°C for 4 hours, so that the asphalt is melted and coated on the surface of the composite graphite particle artificial graphite; the obtained asphalt-coated product is mixed with Tween 20, hydrogen peroxide (30%), and phosphoric acid according to 100:3.5:14: The mass ratio of 2 is mixed to make a water slurry with a solid content of 50%, and it is dried in a drying oven at 100°C for 8 hours for curing reaction. Pre-carbonize at 2°C / min to 600°C for 1 hour, cool down to room temperature and depolymerize in a mixer for 30 minutes, then put it into an atmosphere furnace and raise the temperature at 2°C / min to 1150°C for 4 hours under nitrogen protection, then cool down After reaching room temperature, the material is discharged and sieved to obtain a hard carbon-coated graph...
Embodiment 2
[0045] Put composite particle artificial graphite (D50=15 μm) and medium temperature petroleum pitch powder (D50=5 μm) into the mixer according to the mass ratio of 100:14 and mix them for 30 minutes. 2°C / min is heated up to 300°C for 4h, so that the asphalt is melted and coated on the surface of the composite graphite particles; : 3.5:13:2 mass ratio mixed to make a water slurry with a solid content of 50%, and dried in a drying oven at 80°C for 18 hours for curing reaction, and the obtained surface bitumen cured coating product was loaded into a pit furnace And under the protection of nitrogen, the temperature was raised to 600°C for 1 hour, and after cooling to room temperature, it was depolymerized in the mixer for 30 minutes, and then put into the atmosphere furnace and heated to 1150°C at 2°C / min under the protection of nitrogen. ℃ carbonization for 4 hours, cooled to room temperature, discharged and sieved to obtain the hard carbon-coated graphite negative electrode mat...
Embodiment 3
[0047] Put the composite particle artificial graphite (D50=15μm) and sucrose into the mixer according to the mass ratio of 100:20 and mix for 30min. After discharging, transfer it to the coating kettle, and raise the temperature to 300℃ at 2℃ / min under nitrogen atmosphere Treat for 4 hours to make sucrose melt-coated on the surface of composite graphite particles; mix the obtained sucrose-coated product with Tween 20, concentrated nitric acid (68%), and phosphorus pentoxide according to the mass ratio of 100:3.5:17:2. Form a water slurry with a solid content of 50%, and dry it in a drying oven at 150°C for 4 hours for curing reaction, put the obtained surface sucrose-cured coating into a well-type furnace and raise the temperature at 2°C / min under the protection of nitrogen Pre-carbonize at 600°C for 1 hour, cool down to room temperature and depolymerize in a mixer for 30 minutes, then put it into an atmosphere furnace and raise the temperature to 1150°C for 4 hours under nitro...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More