Patent ID: 7964240
Filing Date: 2011-06-21
Classification: C01B,C04B,H01M,Y02E

Abstract:
1. A process for making carbon coated graphitic anode powder for use in batteries wherein the process comprises: a) providing green coke having high volatile matter of at least about ten weight percent volatile matter; b) mixing the high volatile matter green coke with a liquid solvent at a selected solvent to carbon ratio to form a solvent suspension and also to extract volatile matter from the green coke, wherein the solvent is selected from the group consisting of toluene, benzene, and xylene; c) altering the solvent strength of the solvent suspension and cause volatile matter that has been extracted from the green coke to precipitate on the coke particles and form a coating thereon, wherein the altering the solvent strength comprises adding anti-solvent to the solvent suspension and the anti-solvent is selected from the group consisting of pentane, hexane, heptane, octane, and nonane; d) separating the solvent with residual dissolved volatile material from the coated green coke particles; e) stabilizing the coated green coke particles by oxidative stabilization while heating to a temperature of at least 200° C. in an oxygen containing environment; f) carbonizing the stabilized coated green coke particles to a temperature of at least 600° C. in an inert environment; and g) graphitizing the coated carbonized coke particles to a temperature of at least 2200° C.