Chemical Industry and Engineering Progress ›› 2022, Vol. 41 ›› Issue (5): 2379-2388.DOI: 10.16085/j.issn.1000-6613.2021-1217

• Energy processes and technology • Previous Articles     Next Articles

Preparation and electrochemical performance of mesocarbon microbeads derived from emulsion-polymerization method

GONG Xin(), LIU Xiaodong, WEN Fushan, SHI Nan, LIU Dong()   

  1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, Shandong, China
  • Received:2021-06-08 Revised:2021-09-08 Online:2022-05-24 Published:2022-05-05
  • Contact: LIU Dong

中间相炭微球乳化-聚合法制备及电化学性能

龚鑫(), 刘小冬, 温福山, 师楠, 刘东()   

  1. 中国石油大学(华东)重质油国家重点实验室,山东 青岛 266580
  • 通讯作者: 刘东
  • 作者简介:龚鑫(1994—),女,博士研究生,研究方向为重质油化学和石油基材料。E-mail:505613956@qq.com
  • 基金资助:
    山东省重点研发计划(2020CXGC010308);泰山学者基金(ts20190919);中国石油大学 (华东) 研究生创新工程项目(YCX2021065)

Abstract:

A kind of mesophase pitch-based microspheres (MPMB-et) with perfect spherical shape and narrow particle size distribution were prepared by emulsion-polymerization method from petroleum-based isotropic pitch. After pre-oxidation and carbonization, the mesocarbon microbeads (MCMB-et) were obtained. The properties of MCMB-et were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and other analytical methods. Subsequently, the electrochemical performance of microspheres as the anode material for lithium-ion battery was tested. Results showed that MCMB-et had a large specific surface area (13.35m2/g), wide interlayer spacing (0.352nm) and moderate structural disorder degree (the orientation of carbon layers with the MCMB-et were distorted and irregular), which promoted the intercalation and extraction rate of lithium ions between the graphite-like flakes and active sites. Compared with the MCMBs prepared by the direct thermal polycondensation method (MCMB-t) and the direct emulsification method (MCMB-e), the MCMB-et prepared by the polymerization-emulsification method had obvious advantages in terms of cycle performance and rate performance. MCMB-et could still deliver a reversible capacity of 325.3mAh/g at a current density of 500mA/g for 100 cycles and maintain a specific capacity of 240.0mAh/g at a high current density of 2A/g.

Key words: petroleum, emulsion-polymerization method, mesocarbon microbeads, microstructure, electrochemistry, lithium-ion battery

摘要:

以石油基各向同性沥青为原料,采用乳化-聚合法制备出一种球形规整、粒径分布较窄的中间相沥青基微球(MPMB-et)。经过预氧化、炭化得到中间相炭微球熟球(MCMB-et),采用扫描电镜(SEM)、高分辨透射电镜(HRTEM)、X射线衍射(XRD)和Raman光谱等分析手段表征了MCMB-et的外部形貌和微观结构,并对微球的储锂性能进行测试,结果表明:MCMB-et具有较大的比表面积(13.35m2/g)、较宽的层间距(0.352nm)和一定的结构无序度(内部类石墨片层堆积结构排列无序),加快了锂离子在类石墨片层间及活性位点的嵌入和脱出。与直接热缩聚法(MCMB-t)和直接乳化法(MCMB-e)制备的微球相比,MCMB-et在循环性能和倍率性能方面均具有明显的优势,MCMB-et在500mA/g的电流密度下循环100圈仍能保持325.3mAh/g的比容量,并在2A/g的高电流密度下仍能保持240.0mAh/g的比容量。

关键词: 石油, 乳化-聚合法, 中间相炭微球, 显微结构, 电化学, 锂离子电池

CLC Number: 

京ICP备12046843号-2;京公网安备 11010102001994号
Copyright © Chemical Industry and Engineering Progress, All Rights Reserved.
E-mail: hgjz@cip.com.cn
Powered by Beijing Magtech Co. Ltd