中间相沥青基炭负极材料的制备及性能  

Preparation and properties of mesophase pitch-based anode material

作　　者：张晓林[1] 王成扬[1] 郭雪飞[1] 邸婧[1] 

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《电源技术》2007年第4期277-280,共4页Chinese Journal of Power Sources

摘　　要：石油系中间相沥青(MP)经3种方法处理后,对其进行X射线衍射、扫描电镜和电化学性能分析。结果表明:中间相沥青经溶剂萃取-氧化-炭化-石墨化后,作为锂离子蓄电池负极材料,首次充电比容量为422mAh/g,首次效率为91%,20次循环后比容量保持为375mAh/g,比石墨的理论比容量要高;经氧化-炭化-石墨化后的MP,电化学性能要差一些,首次充电比容量为401mAh/g,首次效率为76.5%,稳定后比容量为294mAh/g;未经石墨化的MP没有明显的充放电平台,充放电曲线呈V字型,比容量仅为194mAh/g。与已商业化的中间相炭微球相比,中间相沥青基负极材料制备工艺简单,成本低,比容量高,若可以进一步提高其充放电效率,将具有很好的应用前景。A mesophase pitch （MP） derived from petroleum residue was treated by three ways and these materials were investigated by X-ray diffraction, scanning electron microscopy and electrochemical methods, The results show that the first charging capacity of the sample treated by solvent-extraction, carbonization, oxidation and graphitization is 422 mAh/g and the initial efficiency is 91%, after 20 cycles the capacity is still 375 mAh/g that is higher than the theoretical value of graphite. The electrochemical performances of the sample treated by carbonization, oxidation and graphitization are 401 mAh/g, 76.5%, 294 mAh/g, respectively. The ungraphitized sample has not a charge-discharge plateau, the charge-discharge curves display a shape of letter ＇V＇, and its capacity is only 194 mAh/g. Compared with mesocarbon microbeads, the preparation of MP-based material is simpler and the capacity is higher, so it has advantages to be a kind of very promising anode material for U-ion battery if the efficiency is improved.

关 键 词：中间相沥青 溶剂萃取 氧化 石墨化 

分 类 号：TM912.9[电气工程—电力电子与电力传动]