| 煤沥青基微晶炭的制备及其储锂性能 |
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| 引用本文： | 王振帅,邢宝林,韩学锋,曾会会,侯磊,郭晖,张传祥,岳志航. 煤沥青基微晶炭的制备及其储锂性能[J]. 化工进展, 2021, 40(1): 313-323. DOI: 10.16085/j.issn.1000-6613.2020-0496 |
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| 作者姓名： | 王振帅 邢宝林 韩学锋 曾会会 侯磊 郭晖 张传祥 岳志航 |
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| 作者单位： | 河南理工大学化学化工学院,河南焦作454000;河南理工大学化学化工学院,河南焦作454000;煤炭安全生产河南省协同创新中心,河南焦作454000;煤炭安全生产河南省协同创新中心,河南焦作454000 |
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| 基金项目： | 河南省高等学校青年骨干教师培养计划(2017GGJS052);河南省科技攻关项目(202102210183) |
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| 摘 要： | 以工业副产物煤沥青（coal tar pitch, CTP）为原料，采用高温炭化法制备煤沥青基微晶炭，利用XRD、Raman光谱、SEM、TEM和XPS等手段对其微观结构和表面化学性质进行表征，并探究微晶炭用作锂离子电池负极材料的储锂特性。结果表明，煤沥青经不同温度（800~1100℃）炭化处理后可制备出石墨微晶和无定形炭共存的微晶炭。炭化温度是影响煤沥青基微晶炭的微晶片层、纳米孔道和结构缺陷等微观结构特征和表面化学性质的重要因素。当炭化温度为800℃时，煤沥青基微晶炭CTP-800具有较为有序的石墨微晶片层和丰富的纳米孔道、结构缺陷等无定形炭，且两者有机结合，相互镶嵌，构筑成三维网络结构，同时炭基体表面含有适量氧/氮官能团。该微晶炭用作锂离子电池负极材料时具有优异的储锂特性，在50mA/g电流密度下可逆容量可达305mA·h/g，1000mA/g大电流密度下仍可维持在174mA·h/g，经100次循环后可逆容量保持率超过99.0%，显示出良好的倍率性能和优异的循环稳定性，是一种较为理想的锂离子电池负极材料。煤沥青基微晶炭 CTP-800优异的储锂特性与其炭基体中含有石墨微晶片层与纳米孔道、结构缺陷等无定形炭和炭表面富含氧/氮官能团等因素密切相关。
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| 关 键 词： | 煤沥青 微晶炭 负极材料 储锂性能 |
| 收稿时间： | 2020-04-01 |
Preparation of coal tar pitch-based microcrystal carbons and their lithium storage properties |
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| Zhenshuai WANG,Baolin XING,Xuefeng HAN,Huihui ZENG,Lei HOU,Hui GUO,Chuanxiang ZHANG,Zhihang YUE. Preparation of coal tar pitch-based microcrystal carbons and their lithium storage properties[J]. Chemical Industry and Engineering Progress, 2021, 40(1): 313-323. DOI: 10.16085/j.issn.1000-6613.2020-0496 |
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| Authors: | Zhenshuai WANG Baolin XING Xuefeng HAN Huihui ZENG Lei HOU Hui GUO Chuanxiang ZHANG Zhihang YUE |
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| Affiliation: | 1.College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
2.Innovation Center of Coal Work Safety, Jiaozuo 454000, Henan, China |
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| Abstract: | In this paper, coal tar pitch (CTP), a by-product of industry, was used as raw material to prepare CTP-based microcrystal carbons by high-temperature carbonization. The microstructure and surface properties of CTP-based microcrystal carbons were characterized by means of X-ray diffraction (XRD), Raman spectrum, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The lithium storage characteristics of CTP-based microcrystal carbons applied as anode materials were also investigated. The results showed that CTP-based microcrystal carbons coexisting graphite microcrystalline structure and amorphous structure can be prepared by carbonization of coal tar pitch at different temperatures (800—1100℃). Microstructural characteristics such as microcrystalline layers, nanopore channels and structural defects and surface chemical properties of CTP-based microcrystal carbons were strongly dependent on the carbonization temperature. When the carbonization temperature was 800℃, CTP-based microcrystal carbon CTP-800 had a relatively ordered graphite microcrystalline layer and abundant amorphous carbon such as nanopore channels and structural defects, and the two were organically combined and embedded with each other to form a three-dimensional network structure, and the surface of carbon matrix contained appropriate oxygen/nitrogen functional groups. Such CTP-based microcrystal carbon had excellent lithium storage characteristics when it used as anode material for lithium ion batteries. The reversible capacity reached as high as 305mA·h/g at current rate of 50mA/g and still remained 174mA·h/g at current rate of 1000mA/g, and the reversible capacity retention rate was over 99.0% after 100 cycles. Such results indicated that the microcrystal carbon CTP-800 had good rate performance and excellent cycle stability, which might become a promising anode material for lithium ion batteries. The excellent lithium storage characteristics of CTP-800 were strongly depended on their unique microstructure in carbon matrix including graphite microcrystalline layer, amorphous carbon such as nanopore channel and structural defects, and oxygen/nitrogen-rich functional groups on the carbon surface. |
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| Keywords: | coal tar pitch microcrystal carbons anode materials lithium storage properties |
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