煤炭转化2025，Vol.48Issue(6)：112-122,11.DOI:10.19726/j.cnki.ebcc.202506010
宁夏汝箕沟无烟煤高温石墨化及其电化学性能研究
Study on graphitization process of Ningxia Rujigou anthracite and their electrochemical properties under series high-temperature treatment
摘要
Abstract
Based on the structural properties of coal to make value-added graphitic carbon materials contributes to the clean coal utilization.However,few studies have focused on the structural evolution stages of high-temperature treated anthracite,and their electrochemical properties,which limits the industrial application of coal-based graphitic carbon materials.A series of coal-based graph-ite with different graphitization degree were synthesized from Ningxia Rujigou anthracite through a range of high temperatures(1 600℃-2 900℃)in this study.The growth of graphite crystallite was investigated by proximate and ultimate analyses,X-ray diffraction analysis,Raman spectroscopy analysis,etc.The electrochemical properties of series coal-based graphite as anode material were also analyzed.The C content in the series coal-based graphite samples is characterized by a rapid increase from room temperature to 2 100℃,followed by a gradual increase to 100%as the temperature increases to 2 900℃.The(002)peak of XRD patterns becomes sharper as the temperature increases to 2 900℃,indicating a high graphitization degree and a well-crystallized graphite structure.The G peak in the first-order Raman spectra becomes stronger,while the D peak weakens as the treatment temperature increases.The non-graphitized coal particles in the treated samples exhibit a dense mor-phology under SEM,whereas flat micrometer-sized lamellar graphite forms in the samples treated above 2 500℃.Based on the XRD and Raman spectroscopy results,anthracite graphitization pro-cesses are classified into three stages:the carbonization stage is from 0 to 1 800℃,the semi-graphitization stage is from 1 800℃to 2 500℃,and the graphitization stage is from 2 500℃to 2 900℃.The initial Coulombic efficiency of the coal-based graphite as the anode material gradually increases with the graphitization temperature.The cell interface resistance first decreases and then increases with the final graphitization temperature.The Coulombic efficiency stability is markedly superior for the RJG-2100,much better than for RJG-1800 and RJG-2500.The cell interface resis-tance is 17 Ω for RJG-2100,which is lower than that of RJG-1800(40 Ω)and RJG-2900(33 Ω).The graphitization degree of coal-based graphite formed from anthracite,can even surpass that of natu-ral graphite.Meanwhile,some electrochemical parameters of the samples at the semi-graphitization stage are superior to those treated at higher temperature.关键词
无烟煤/高温石墨化/煤基石墨/石墨晶畴生长/电化学性能Key words
anthracite/high-temperature graphitization/coal-based graphite/graphite crys-tallite growth/electrochemical performance分类
化学工程引用本文复制引用
张文杰,李阔,丁小雨,黄杜斌,曾龙,张昱博,刘钦甫..宁夏汝箕沟无烟煤高温石墨化及其电化学性能研究[J].煤炭转化,2025,48(6):112-122,11.基金项目
国家自然科学基金创新研究群体项目(42321002)、国家自然科学基金项目(42572212和42472229)、中央高校基本科研业务费资助项目(2023ZKPYDC08)和中国矿业大学(北京)大学生创新训练项目(202302011). （42321002）
