您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

[PDF Download]    [Flash Online]

    

Intercalation mechanisms of
lithium into graphitized needle cokes
SU Yu-chang(苏玉长)1, YING Zhi-min(尹志民)1, XU Zhong-yu(徐仲榆)2

1. Department of Materials Science and Engineering,
Central South University, Changsha 410083, P.R.China;
2. Institute of New carbon materials, Hunan University,
Changsha 410082, P.R.China

Abstract:A needle coke was graphitized at different heat treatment temperature ( 2000℃ to 3000℃ ). The electrochemical intercalation mechanism of Li into the graphitized coke has been studied in Li|1mol·L-1 LiClO4+ ethylene carbonate/diethylene carbonate|graphite cells, using an in-situ X-ray diffraction (XRD) technique. The study of Li-C intercalation processes of the graphitized coke reveals that there are three major types of intercalation behavior. The first is uniformly intercalated at all Li-C compounds in graphitized coke heated at 2250℃; the second is obviously staging phenomenon during intercalating for the graphitized coke heated at 2750℃; the third is cointercalation of solvated Li-ion at high potential (>0.3V ) and then lithium electrochemical intercalation at lower potential for that heated at 3000℃, resulting in the decrease of capacity and efficiency of graphite negative electrode for lithium-ion secondary battery.

 

Key words: needle coke; graphitized; intercalation

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn