초록 ▼

A graphite powder may include highly oriented grain aggregates, wherein the electrical resistivity of the powder decreases with increasing density. A process for coating a substrate may include providing a coating dispersion including such a graphite powder and applying the coating dispersion to the

A graphite powder may include highly oriented grain aggregates, wherein the electrical resistivity of the powder decreases with increasing density. A process for coating a substrate may include providing a coating dispersion including such a graphite powder and applying the coating dispersion to the substrate. An electrode may contain such a graphite powder. A coating dispersion may include such a graphite powder dispersed in a liquid medium. A battery may include such a graphite powder. A compressed body of pure graphite may include such a graphite powder. A lubricant may include such as graphite powder.

대표청구항 ▼

1. A graphite powder comprising: highly oriented grain aggregates,wherein the electrical resistivity of the powder decreases with increasing density. 2. The graphite powder according to claim 1, wherein the electrical resistivity of the powder is decreasing with increasing density between 10 and 40%

1. A graphite powder comprising: highly oriented grain aggregates,wherein the electrical resistivity of the powder decreases with increasing density. 2. The graphite powder according to claim 1, wherein the electrical resistivity of the powder is decreasing with increasing density between 10 and 40% in the density range between 1.5 and 1.8 g/cm3. 3. The graphite powder according to claim 1, wherein the average particle size is between 10 and 50 microns and the BET surface area is higher than 10 m2/g. 4. The graphite powder according to claim 1, wherein the average particle size is between 5 and 10 microns and the BET surface area is higher than 15 m2/g. 5. The graphite powder according to claim 1, wherein the average particle size is between 1 and 5 microns and the BET surface area is higher than 25 m2/g. 6. The graphite powder according to claim 1, wherein the crystal size in the crystallographic c-direction (Lc) is larger than 10 nm. 7. The graphite powder according to claim 1, wherein the spring-back is less than or equal to 10%. 8. The graphite powder according to claim 1, wherein the fraction of rhombohedral crystallinity is less than 10%. 9. The graphite powder according to claim 1, wherein substantially no rhombohedral stacking is present, and the graphite powder has a loss of at least 15% by weight as measured by thermogravimetric analysis (TGA) at a temperature below 730° C. 10. A process for coating a substrate comprising: providing a coating dispersion comprising the graphite powder according to claim 1; andapplying the coating dispersion to the substrate. 11. The process of claim 10, wherein the providing comprises mechanically treating a starting graphite powder in a liquid medium to obtain the highly oriented grain aggregates. 12. The process of claim 11, wherein the liquid medium is water. 13. The process of claim 10, wherein the substrate comprises a current collector. 14. An electrode containing the graphite powder according to claim 1. 15. The electrode of claim 14, wherein, at a concentration of 5% of the graphite powder, the electrical resistivity in the electrode is at least 20% lower than for comparative graphite material not mechanically treated in the presence of a liquid medium. 16. A coating dispersion comprising the graphite powder according to claim 1 dispersed in a liquid medium. 17. The coating according to claim 16, wherein the liquid medium comprises water. 18. A battery comprising the graphite powder according to claim 1. 19. A compressed body of pure graphite, wherein the graphite is made from the graphite powder according to claim 1. 20. A lubricant comprising the graphite powder according to claim 1.