Graphite powder for lithium ion secondary battery negative electrode active material
A negative electrode active material and graphite powder technology, which is applied in batteries, graphite powder for battery electrodes, and graphite powder. It can solve problems such as orientation and achieve high electrode density, small electrode expansion rate, initial charge and discharge efficiency, and capacity retention rate. excellent effect
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Embodiment 1
[0197] The calcined coke with AR(60)=2.2 was pulverized with a bandam mill manufactured by Hosokawa Micron, and then the coarse powder was sieved out using a sieve with openings of 32 μm. Next, airflow classification was performed using a turbine classifier Turbine Classifier Turbine Classifier TC-15N manufactured by Nissin Engineering to obtain powder calcined coke 1 with D50=22.3 μm substantially free of particles with a particle diameter of 1.0 μm or less.
[0198]This powder calcined coke 1 was heated for one week in an Acheson furnace so that the maximum temperature reached was about 3300° C., thereby performing graphitization treatment. At this time, a plurality of oxygen inflow holes were provided in the crucible, and air was allowed to enter and exit during and before the graphitization treatment, and the powder was oxidized for about one week during the cooling process, and graphite powder with flake particles was obtained. .
[0199] Coarse powder was removed from t...
Embodiment 2
[0202] 100 parts by mass of calcined coke powder obtained in the same manner as in Example 1, and 2 parts by mass of petroleum-based pitch powder having a quinoline-insoluble content of 1 mass % and a β resin component of 48 mass % were charged into an autorotation-revolution mixer 20 minutes of dry mixing was carried out at 2000rpm, and the resulting mixture was heated in an Acheson furnace with a maximum temperature of about 3300°C for 1 week using a closed crucible, thereby performing graphitization. Then, the coarse powder was removed using the sieve with the opening of 32 micrometers. The obtained graphite powder was subjected to an oxidation treatment at 1100° C. for 1 hour in air, and the coarse powder was removed using a sieve with openings of 32 μm to obtain a graphite powder having flake-like particles. Table 2 shows the analysis results of the obtained graphite powder.
Embodiment 3
[0204] Green coke produced in China was pulverized and polarized in the same manner as in Example 1 to obtain powdered green coke 2 with D50 = 24.5 μm substantially free of particles with a particle diameter of 1.0 μm or less. Green coke 2 was calcined at 1100°C, and AR(60) was calculated to be 2.1.
[0205] The powdered green coke 2 was graphitized and oxidized in the same manner as in Example 1, and coarse powder was removed from the obtained graphite powder using a sieve with openings of 32 μm to obtain graphite powder with flake particles. Table 2 shows the analysis results of the obtained graphite powder.
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