Modified hard carbon negative electrode material, preparation method thereof, lithium ion battery and negative electrode material thereof
A lithium-ion battery and anode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant first discharge efficiency and voltage hysteresis, high reversible capacity, irregular morphology of modified hard carbon anode materials, etc. Achieve the effect of high first discharge efficiency, high discharge capacity, and no obvious voltage hysteresis
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Embodiment 1
[0078] The preparation of the modified hard carbon negative electrode material specifically includes the following steps:
[0079] Step (1), the mixed atmosphere in which the mass ratio of nitrogen and oxygen was 5:1 replaced the atmosphere in the tube furnace, then 300 g of petroleum pitch (particle size D50 was 10 μm) was placed in the tube furnace, and the tube furnace was The furnace is heated to 150 °C for pre-oxidation treatment for 8 hours; the pre-oxidized materials are placed in a pit furnace at 500 ° C for pre-carbonization treatment for 2 hours; then the pre-carbonized materials are placed in a jet mill for crushing The powder was processed to a particle size of 9 μm, and then the powder was placed in a tube furnace for carbonization treatment at 900° C. for 4 hours to obtain a precursor.
[0080] Step (2), add 7.1 g of resorcinol to 20.0 g of deionized water, stir until completely dissolved, add 100 g of the precursor, and perform the first mixing treatment to obta...
Embodiment 13
[0088] Preparation of Lithium Ion Batteries
[0089] The preparation of the lithium ion battery in each of the above Examples 1 to 12 and Comparative Examples 1 to 5 specifically includes the following steps:
[0090] (1) Using N-methylpyrrolidone as solvent to prepare a polyvinylidene fluoride solution with a mass fraction of 6-7%, and adding hard carbon negative electrode material and conductive carbon black to the 6-7% polyvinylidene fluoride solution and stirring evenly The mass ratio of 6-7% polyvinylidene fluoride solution, hard carbon anode material, and conductive carbon black in the battery anode slurry is 80:10:10;
[0091] (2) uniformly coating the battery negative electrode slurry on the copper foil by a coating machine to make a pole piece;
[0092] (3) vacuum drying the pole piece in a vacuum drying oven at 110°C for 4 hours, and then rolling the pole piece on a roller press to obtain a lithium ion battery negative electrode material;
[0093] (4) Using metal l...
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