Hard carbon is difficult to prepare as high-crystallinity synthetic graphite even with graphitization (over 2400 °C), so only soft carbon has been used as a raw material for the preparation of synthetic graphite. Therefore, the selection of raw materials for synthetic graphite preparation is limited. In this study, synthetic graphite was prepared from hard carbon-based carbon black (HCCB) to overcome the issue of the limited selection of synthetic graphite raw materials. Synthetic graphite was prepared by a 3-step heat treatment from a mixture of HCCB and Si. SiC was synthesized from HCCB by a first heat treatment, and unreacted HCCB was removed through a second heat treatment. In a third heat treatment, synthetic graphite was prepared by removing Si from SiC. The prepared synthetic graphite had a high-crystallinity and few defects, and the powder electrical conductivity was approximately 22.7 times higher than that of graphitized HCCB. The introduced new method is expected to induce diversification of raw materials for the preparation of synthetic graphite, thereby solving the problems of the traditional preparation method.

即使经过石墨化处理（超过2400°C），硬碳也很难制备成高结晶度的合成石墨，因此只有软碳才被用作制备合成石墨的原料。因此，用于合成石墨制备的原料的选择受到限制。在这项研究中，合成石墨是由硬碳基炭黑（HCCB）制备的，以克服合成石墨原料选择受限的问题。通过HCCB和Si的混合物通过三步热处理制备合成石墨。通过第一次热处理从HCCB合成SiC，并通过第二次热处理除去未反应的HCCB。在第三热处理中，通过从SiC去除Si来制备合成石墨。制备的合成石墨结晶度高，缺陷少，粉末的电导率约为石墨化六氯苯的22.7倍。预期引入的新方法将引起用于制备合成石墨的原料的多样化，从而解决传统制备方法的问题。