Man-made graphite cathode material for lithium ion battery and its making method
A technology of artificial graphite negative electrode and lithium-ion battery, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effects of optimizing microscopic arrangement, reducing irreversible capacity loss, and improving compaction density and
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Embodiment 1
[0036] Example 1: Crushing petroleum-based needle coke to D 50 = about 18 μm, after preheating at 80°C for 2 hours, fully mix with 2.5wt.% boric acid aqueous solution to make a suspension, spray dry and granulate at 180°C, and raise the temperature of the above granules under the protection of nitrogen After reaching 1100°C, keep it warm for 2 hours, and then drop to room temperature to obtain an artificial graphite negative electrode material such as figure 1 As shown, its average particle size D 50 18.4μm, specific surface area 2.8m 2 / g, such as figure 2 As shown, the crystal layer spacing d 002 0.340nm, such as image 3 As shown, it has good charge and discharge performance.
Embodiment 2
[0037] Example 2: Crushing petroleum-based needle coke to D 50 = about 5 μm, after preheating at 120°C for 4 hours, fully mix with 2wt.% Si, spray dry and granulate at 250°C, and graphitize the above particles at 2500°C for 48 hours under the protection of nitrogen , down to room temperature, to obtain artificial graphite anode materials such as Figure 4 As shown, its average particle size D 50 5.5μm, specific surface area 1.7m 2 / g, such as Figure 5 As shown, the crystal layer spacing d 002 0.337nm, such as Figure 6 As shown, it has good charge and discharge performance.
[0038] Such as figure 1 As shown, the artificial graphite negative electrode material of the present invention undergoes a large change in its particle shape after spray drying granulation, surface coating modification and heat treatment, such as Figure 7 As shown, before the modification treatment, the particle shape of the needle coke was irregular strips, with more fine powder and a larger sp...
Embodiment 3
[0039] Example 3: Coal needle coke pulverized to D 50 = about 30 μm, after preheating at 160°C for 1 hour, fully mix with an aqueous solution of 1.5wt.% boric acid + 10wt.% SBR to make a suspension, spray dry and granulate at 150°C, and put the above granules in nitrogen Under the protection of , the temperature was raised to 800°C and then kept for 10 hours, and then lowered to room temperature to obtain the artificial graphite negative electrode material with an average particle size of D 50 34.2μm, specific surface area 2.9m 2 / g, crystal layer spacing d 002 is 0.344nm.
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