Spherical carbons and method for preparing the same
AssigneeLG Chem, Ltd.
InventorsOu-Jung Kwon, Seung-Mo Oh, Ki-Young Lee, Myung-Hwan Kim, Kyu-Tae Lee
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Abstract
The present invention provides a method for preparing spherical carbon comprising step of heat-treating a mixture of a carbon precursor and dispersion media, a spherical non-graphitizable carbon using the same, and a method for preparing spherical artificial graphite.
Claims21
A method for preparing spherical carbon comprising the step of heat-treating a mixture of a carbon precursor and a dispersion media.
A method for preparing spherical non-graphitizable carbon comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a hydrophobic inorganic substance dispersion media at 700 to 1500° C. under inert atmosphere to carbonize the carbon precursor;
- and
- b) adding an acid or alkali solvent to the a) carbide to remove inorganic substance.
A method for preparing spherical non-graphitizable carbon comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a silicone oil dispersion media at a glass transition temperature or softening temperature of the carbon precursor to 300° C. to make the carbon precursor spherical;
- b) adding an organic solvent to the a) spherical carbon precursor to remove silicone oil;
- and
- c) heat-treating the b) spherical carbon precursor at 700 to 1500° C. under inert atmosphere to carbonize the spherical carbon precursor.
A method for preparing spherical artificial graphite comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a hydrophobic inorganic substance dispersion media at 700 to 1500° C. under inert atmosphere to carbonize the mixture;
- b) adding an acid or alkali solvent to the a) carbide to remove inorganic substance;
- and
- c) heat-treating the b) spherical carbon at 2000 to 3200° C.
A method for preparing spherical artificial graphite comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a hydrophobic inorganic substance dispersion media at a softening temperature of the carbon precursor to 600° C. to make the carbon precursor spherical;
- b) adding an acid or alkali solvent to the a) spherical carbon precursor to remove inorganic substance;
- c) performing oxidative stabilization of the b) spherical carbon precursor at 100 to 400° C. for 1 minute to 2 hours under air atmosphere;
- d) heat-treating the c) spherical carbon precursor at 700 to 1500° C. under inert atmosphere to carbonize the spherical carbon precursor;
- and
- e) heat-treating the d) spherical carbon at 2000 to 3200° C.
A method for preparing spherical artificial graphite comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a hydrophobic inorganic substance dispersion media at a softening temperature of the carbon precursor to 600° C. to make the carbon precursor spherical;
- b) adding an acid or alkali solvent to the a) spherical carbon precursor to remove inorganic substance;
- c) performing oxidative stabilization of the b) spherical carbon precursor at 100 to 400° C. for 1 minute to 2 hours under air atmosphere;
- and
- d) heat-treating the c) spherical carbon at 2000 to 3200° C.
A method for preparing spherical artificial graphite comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a silicone oil dispersion media at a softening temperature of the carbon precursor to 300° C. to make the carbon precursor spherical;
- b) adding an organic solvent to the a) spherical carbon precursor to remove silicone oil;
- c) performing oxidative stabilization of the b) spherical carbon precursor at 100 to 400° C. for 1 minute to 2 hours under air atmosphere;
- d) heat-treating the c) spherical carbon precursor at 700 to 1500° C. under inert atmosphere to carbonize the spherical carbon precursor;
- and
- e) heat-treating the d) spherical carbon at 2000 to 3200° C.
A method for preparing spherical artificial graphite comprising the steps of:
- a) heat-treating a mixture of a carbon precursor and a silicone oil dispersion media at a softening temperature of the carbon precursor to 300° C. to make the carbon precursor spherical;
- b) adding an organic solvent to the a) spherical carbon precursor to remove silicone oil;
- c) performing oxidative stabilization of the b) spherical carbon precursor at 100 to 400° C. for 1 minute to 2 hours under air atmosphere;
- and
- d) heat-treating the c) spherical carbon at 2000 to 3200° C.
Spherical non-graphitizable carbon comprising 10 wt % or more of spherical particles satisfying the following Mathematical Formula 1:
- [Mathematical Formula 1]
- 0.99≦a/b≦1
- where a is a minor axis of a particle and b is a major axis of a particle.
A method for preparing a spherical carbon precursor comprising the step of heat-treating a mixture of a carbon precursor and a dispersion media at a glass transition temperature or softening temperature of the carbon precursor to 600° C.
Dependencies are inferred from the claim text.