Negative electrode carbon material for nonaqueous secondary battery, negative electrode, and nonaqueous secondary battery
A secondary battery and negative electrode material technology, applied in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of small reversible capacity, increase of irreversible capacity for charging and discharging, and failure to achieve high capacity, etc., to achieve charging and discharging Excellent rate characteristics, less expansion and gas generation, and less deterioration
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[0132] The firing temperature varies depending on the organic compound used in the preparation of the mixture, but in the case of obtaining a composite carbon material (A) coated with (amorphous) carbonaceous substance or graphite substance, it is usually heated to 500°C Above, preferably at 800°C or above, more preferably at 900°C or above, the organic compound is sufficiently carbonized. The upper limit of the heating temperature is the temperature at which the carbide of the organic compound does not attain a crystal structure equivalent to that of the raw carbon material (a) in the mixture, and is usually at most 3000°C or less, preferably 2000°C or less, more preferably 1500°C or less. below ℃.
[0133] In the firing treatment conditions, thermal history temperature conditions, heating rate, cooling rate, heat treatment time, and the like are appropriately set. Alternatively, heat treatment may be performed in a relatively low temperature region, and then the temperature...
Embodiment 1
[0248] Using spheroidized natural graphite as the raw carbon material, use a CIP molding machine at 1000kgf / cm 2 After performing isotropic pressure treatment for 2 minutes, it was crushed and mixed with petroleum-based heavy oil (easily graphitizable organic compound) obtained during thermal cracking of naphtha with a twin-screw kneader. Then the resulting mixture is heat-treated at 700°C for 2 hours in an inert gas, and then heat-treated at 1300°C for 1 hour to obtain carbonaceous substances with different crystallinity coated on the surface of the spheroidized natural carbon material Composite carbon material (A) as a multilayer carbon structure. Here, the composite carbon material (A) has a volume-based average particle diameter (d50) of 23.0 μm and a BET specific surface area (SA) of 1.9 m 2 / g, tap density (tap) is 1.17g / cm 3 , Raman R value is 0.36.
[0249] It should be noted that the porosity in the particles after the isotropic pressurization treatment was 18%, an...
Embodiment 2
[0266] Use spheroidized natural graphite as the raw carbon material, and use a CIP molding machine at 1000kgf / cm 2After carrying out isotropic pressure treatment for 2 minutes, crushing was carried out, and this was mixed with petroleum-based heavy oil (easily graphitizable organic compound) obtained during thermal cracking of naphtha by a twin-screw kneader. Next, the resulting mixture was heat-treated at 700°C for 2 hours in an inert gas, and then heat-treated at 1300°C for 1 hour to obtain a carbonaceous material with different crystallinity coated on the surface of the spheroidized natural carbon material. The multilayer carbon structure of the material is the composite carbon material (A). Here, the composite carbon material (A) has a volume-based average particle diameter (d50) of 16.8 μm and a BET specific surface area (SA) of 3.1 m 2 / g, tap density (tap) is 1.17g / cm 3 , Raman R value is 0.27.
[0267] As the carbon material (B), a d50 of 10.9 μm and an SA of 8.8 m ...
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