摘要:
The present invention relates to an artificial graphite material for a negative electrode of a lithium ion secondary battery which shows smaller deteriorations of the capacity of charging and discharging cycles and which has a reduced internal resistance and a high output characteristic. It is an artificial graphite material for a lithium ion secondary battery negative electrode, wherein the size L(112) of a crystallite in the c-axis direction is 5 to 25 nm; the ratio (ID/IG) of the intensities of peaks is 0.05 to 0.2; and the relative absorption intensity ratio (I4.8 K/I280 K) is 5.0 to 12.0.
摘要:
Provided are petroleum coke having a sufficiently small coefficient of thermal expansion (CTE) and yielding sufficiently suppressed puffing phenomenon and a method for stably producing the petroleum coke. Specifically, the method for producing the petroleum coke comprises the step of coking feedstock oil comprising light oil having an end point of distillation of 380°C or less, and heavy oil having an initial boiling point of 200°C or more and comprising 50% by mass or more of an aromatic component, sulfur content of 0.5% by mass or less, and nitrogen content of 0.2% by mass or less.