太西煤的石墨化改性及其锂离子电池负极性能

采用石墨化炉对太西煤进行石墨化处理。以沥青为前躯体采用液相包覆的方法实现表面包覆并经高温（1 000℃）炭化处理,制备具有核壳结构的炭石墨复合材料。经过电化学表征,首次可逆比容量为330.4 mAh/g,首次库伦效率为90%,50个循环后容量仍保持在90%。通过对石墨化处理后太西煤的微观结构和包覆炭层的表征分析,认为石墨化太西煤具有类似微晶石墨的微观结构,有利于锂离子的嵌入脱出,包覆炭层减少了比表面积,减少了表面不可逆反应以及固体电解质中间相膜（SEI膜）的生成,同时在循环过程中起到缓冲作用,保证了石墨化太西煤结构的稳定。...

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Bibliographic Details
Published in煤炭学报 Vol. 37; no. 11; pp. 1925 - 1929
Main Author 时迎迎 臧文平 楠顶 黄正宏 刘旋 郑永平 沈万慈
Format Journal Article
LanguageChinese
Published 2012
Subjects
沥青包覆
石墨化太西煤
负极材料
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ISSN0253-9993

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Summary:采用石墨化炉对太西煤进行石墨化处理。以沥青为前躯体采用液相包覆的方法实现表面包覆并经高温（1 000℃）炭化处理,制备具有核壳结构的炭石墨复合材料。经过电化学表征,首次可逆比容量为330.4 mAh/g,首次库伦效率为90%,50个循环后容量仍保持在90%。通过对石墨化处理后太西煤的微观结构和包覆炭层的表征分析,认为石墨化太西煤具有类似微晶石墨的微观结构,有利于锂离子的嵌入脱出,包覆炭层减少了比表面积,减少了表面不可逆反应以及固体电解质中间相膜（SEI膜）的生成,同时在循环过程中起到缓冲作用,保证了石墨化太西煤结构的稳定。
Bibliography:11-2190/TD
graphitized Taixi coal ; pitch coating ; anode materials
SHI Ying-ying , ZANG Wen-ping, NAN Ding, HUANG Zheng-hong , LIU Xuan , ZHENG Yong-ping , SHEN Wan-ci（ 1. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China ; 2. Tangshan Kimwan Special Carbon ＆ Graphite Co. , Ltd. , Tianjin 301505, China）
Graphitized Taixi coal （GC） was performed by a graphitization furnace. The carbon coating GC was pre- pared by liquid phase mixing of GC with pitch. After carbonization in 1 000 ℃ carbon coating GC has the core shell structure, which means the core is GC and the shell is carbon. As the anode materials in lithium ion rechargeable bat- teries, carbon coating GC shows a reversible capacity of 330. 4 mAh/g and cycle efficiency of 90% in the first cycle, the reversible capacity also reaches 90% after 50 cycles. Base on the SEM results, XRD data and Ramam spectrums of GC and CGC ,the results demonstrate that GC has the similar microstructure with microcrystal graphite,intercal
ISSN:0253-9993