Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第z1期    总第100期    2008年6月

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文章编号:1004-0609(2008)S1-0306-04
Li4Ti5O12/石墨复合材料的湿法制备与表征
熊利芝1, 2,何则强1, 2,尹周澜2,陈启元 2

(1. 吉首大学 化学化工学院,吉首 416000;
2. 中南大学 化学化工学院,长沙 410083
)

摘 要: 以醋酸锂、钛酸丁酯和石墨为原料,无水乙醇为溶剂,采用湿法制备Li4Ti5O12/石墨复合材料。采用X射线衍射、红外光谱、扫描电镜和电化学测试对合成产物进行表征。结果表明:600 ℃氩气气氛中煅烧6 h可制得含碳量5%左右的Li4Ti5O12/石墨复合材料,其可逆容量达到167.1 mA∙h/g;经80次循环后,0.1C放电时容量保持率为99.0%,2.0C放电时容量保持率达到105.1%。与纯Li4Ti5O12相比,Li4Ti5O12/石墨复合材料具有更好的循环性能和倍率性能,是一种优良的锂离子电池负极材料。

 

关键字: 锂离子电池;Li4Ti5O12;负极;湿法

Wet method preparation and characterization of
 Li4Ti5O12/graphite composite
XIONG Li-zhi1, 2 , HE Ze-qiang1, 2, YIN Zhou-lan2, CHEN Qi-yuan2

1. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:Li4Ti5O12/graphite composite was prepared by wet method using lithium acetate, tetrabutyl titanate and graphite as raw materials, ethyl alcohol as solvent. Li4Ti5O12/graphite composites were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical tests. The results show that Li4Ti5O12/graphite composite with 5% carbon can be obtained by annealing the precursor at 600 ℃ for 6 h in Ar atomosphere. The composites can deliver a specific capacity of 167.1 mA∙h/g, 99.0% and 105.1% of the capacity can be retained after being discharged for 80 times at 0.1C and 2.0C, respectively. Compared with pure Li4Ti5O12, Li4Ti5O12/graphite composite bears larger discharge capacity, better cyclability and rate performance, suggesting that Li4Ti5O12/graphite composite is a promising anode material for lithium ion batteries.

 

Key words: lithium ion batteries; Li4Ti5O12; anode; wet method

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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