Graphite material and preparation method thereof, negative plate and lithium ion battery
A technology of graphite material and negative electrode sheet, which is applied in the field of negative electrode sheet and lithium-ion battery, graphite material and its preparation, can solve the problems of poor high-current charge and discharge performance, graphite layer peeling, and affecting the use of sophisticated electronic equipment, etc., to improve Cycle life, the effect of solving expansion deformation
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Embodiment 1
[0060] (1) Needle coke is used as raw material coke for preparing graphite, and a mixed solution of 1 mol / L ammonia water and sodium chloride is prepared, wherein the mass ratio of ammonia water: sodium chloride is 4:6. The needle coke was soaked in the above mixed solution of ammonia water and sodium chloride for 24 hours, and then dried to obtain pretreated needle coke.
[0061] (2) The needle coke pretreated in step (1) was calcined at 500°C for 5 hours for pre-carbonization treatment; then calcined at 1450°C for 5 hours for solid-phase carbonization treatment to obtain calcined needle coke. Then, the calcined needle coke was pulverized and sieved to obtain primary particles A, the average particle diameter D50 of the primary particles A was 7 μm, and the aspect ratio thereof was 0.9˜1.5.
[0062] (3) With hard carbon as the porous carbon material, the primary particle A prepared in step (2) is mixed with hard carbon, wherein the amount of hard carbon is 2wt.%, and then the...
Embodiment 2
[0070] (1)-(2) are the same as (1)-(2) in Example 1.
[0071](3) With soft carbon as the porous carbon material, the primary particle A prepared in step (2) is mixed with soft carbon, wherein the amount of soft carbon is 2wt.%, and then the mixture of primary particle A and hard carbon is placed Carry out carbonization and coating at 1100° C. for 8 hours, and then crush and sieve the coated and carbonized material to obtain primary particles B.
[0072] (4) Using asphalt micropowder as a carbonizable binding agent containing carbon source, the primary particle B prepared in the step (3) is mixed with asphalt micropowder, and the consumption of asphalt micropowder is 18wt%; it is placed in a drum furnace for granulation , followed by high-temperature carbonization at 3000°C for 20 hours, and sieving to obtain double-layer carbon-coated secondary particles C;
[0073] The primary particles B prepared in step (3) were carbonized at a high temperature of 3000° C. for 12 hours to ...
Embodiment 3
[0079] (1) Needle coke is used as raw material coke for preparing graphite, and a mixed solution of 1 mol / L ammonia water and sodium chloride is prepared, wherein the mass ratio of ammonia water: sodium chloride is 4:6. The needle coke is placed in the above mixed solution of ammonia water and sodium chloride, followed by drying to obtain pretreated needle coke.
[0080] (2) The needle coke pretreated in step (1) was calcined at 500°C for 5 hours for pre-carbonization treatment; then calcined at 1450°C for 5 hours for solid-phase carbonization treatment to obtain calcined needle coke. Then, the calcined needle coke was crushed and sieved to obtain primary particles A, the average particle diameter D50 of the primary particles A was 9 μm, and the aspect ratio thereof was 1.5-2.2.
[0081] (3)-(5) are the same as (4)-(5) in Example 2.
[0082] Through the particle size test, the particle size distribution of the graphite material prepared in this embodiment is D10=7 μm; D50=15 ...
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Abstract
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