Study on Structural Evolution of Synthetic Graphite Derived from Lignite Prepared by High Temperature–High Pressure Method

Abundant and cheap lignite is regarded as inferior fuel due to its disadvantages such low heat high moisture. In order realize the value clean, non-fuel utilization of lignite, we used precursor prepare high-quality synthetic graphite through graphitization treatment using temperature–high pressure (HTHP) method, afterwards characterized samples by XRD, Raman, FTIR, SEM-EDS, HRTEM, systematically analyzed effect P-T conditions on structure evolution lignite. Our results demonstrated that temperature dominates accelerates process Under HTHP treatment, aromatic layer directional rearrangement; ordered domain increases rapidly, ductility stacking degree carbon sheets sample are greatly enhanced. Compared with traditional high-temperature method reduces shortens time. Remarkably, as-prepared a 91.87% superior fabricated conventional processing were rapidly prepared from at 6 GPa 1300 °C in 20 min. This study demonstrates feasible effective green, efficient,