Producing coated graphitic anode powders by extracting pitch...

Details Producing coated graphitic anode powders by extracting pitch... Producing coated graphitic anode powders by extracting pitch...

2011-06-21

2011-06-21

Cleveland, Michael (Department: 1712)

Coating processes

Heat decomposition of applied coating or base material

Coating decomposed to form carbide or coating carbonized

C427S226000

Reexamination Certificate

active

07964240

ABSTRACT:
This invention relates to a process for making carbon coated graphitic anode powders for use in batteries including rechargeable lithium-ion batteries wherein the process includes a side product isotropic pitch for use as a precursor in other products and more preferably, as a coating material for other powder or particle products. The process includes the steps of solvent extraction of volatile materials from high volatile material green coke powder. When a desirable amount of the volatile materials have been extracted, the solvent strength is altered to cause some of the volatile materials to precipitate on the powder particles to coat the same. The coated and solvent-extracted particles are then separated from the solvent and oxidatively stabilized, then carbonized and preferably graphitized. The volatile materials remaining in the solvent are valuable and are recovered for use in other processes and other products.

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patent: 7323120 (2008-01-01), Mao
patent: 2005/0136330 (2005-06-01), Mao et al.
patent: 2005/0247914 (2005-11-01), Mao et al.

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