COKING COAL COMPOSITION OF CARBON MATERIAL FOR NEGATIVE ELECTRODE OF LITHIUM ION SECONDARY BATTERY, AND PRODUCTION METHOD THEREOF

摘要

Provided is a coking coal composition for use in a lithium ion secondary battery negative electrode material and useful for achieving excellent high-speed charge and discharge characteristics. This coking coal composition comprises a striped agglomerate obtained by the delayed coking method under the condition that the ratio of the generation rate of a generated gas (mass%), which comprises C1-C4 gases and a hydrogen gas generated by coking processing of heavy oils, over the formation rate of the coking coal composition (mass%) (generation rate / formation rate) is 0.3-0.8. Defining W as the average length of the base side of the stripes, H as the average height, and L as the average length in the vertical direction, H/W is 0.15-0.40, and L/W is 5.0 or greater.