Patent ID: 9147873
Filing Date: 2015-09-29
Classification: C01B,C10B,H01M,Y02E

Abstract:
1. A method for producing an amorphous carbon material for a negative electrode of a lithium ion secondary battery, the method comprising: pulverizing and classifying a raw coke composition obtained from a heavy-oil composition having undergone coking by a delayed coking process to obtain a powder of the raw coke composition, the raw coke composition having a H/C atomic ratio that is a ratio of hydrogen atoms H and carbon atoms C of 0.30 to 0.50 and having a micro-strength of 7 to 17 mass %; subjecting the powder of the raw coke composition to compressive stress and shear stress to obtain a precursor for a carbonized composition; and heating the precursor under an inert atmosphere at a temperature from 900° C. to 1,500° C. to obtain the carbonized composition having a size of a crystallite Lc(002) in a range of 2 nm to 8 nm, the size being calculated from a (002) diffraction line measured by X-ray wide-angle diffractometry, wherein the heavy-oil composition comprises a desulfurized deasphalted oil.