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15卷    第5期    总第74期    2005年5月

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文章编号: 1004-0609(2005)05-0793-06
均匀沉淀法制备SnO2-石墨复合粉及其电化学性能
麻明友1, 何则强1,2, 熊利芝1
李新海2, 肖卓炳1, 吴显明1, 刘文萍1

( 1. 吉首大学 化学化工学院, 吉首 416000;
2. 中南大学 冶金科学与工程学院, 长沙 410083
)

摘 要: 以SnCl4为原料, 尿素为沉淀剂, 采用均匀沉淀法制备了SnO2-石墨复合粉, 用XRD、 SEM、 TG-DTA以及电化学方法对复合粉进行了表征。 结果表明: 由于SnO2和石墨表面上不可避免的电化学还原, 导致复合粉的首次循环具有较大的不可逆容量, 经600 ℃煅烧4 h的复合粉具有较高的可逆容量和循环性能; 含30%SnO2的复合粉在0.1 C的电流倍率下进行充放电, 其初始容量达到520.0 mA·h/g, 经30次循环后平均每次循环的容量衰减率为0.6 %, 表明SnO2-石墨复合粉是一种具有发展前途的锂离子电池负极材料。

 

关键词:  SnO2; 复合粉; 锂离子电池; 均匀沉淀法; 电化学性能

Preparation and electrochemical properties of SnO2-graphite composites by homogeneous precipitation technique
MA Ming-you1, HE Ze-qiang1,2, XIONG Li-zhi1,
 LI Xin-hai2, XIAO Zhuo-bing1, WU Xian-ming1, LIU Wen-ping1

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

Abstract: SnO2-graphite composites were prepared by homogeneous precipitation technique using SnCl4 as starting materials and urea as precipitator. The SnO2-graphite composites were characterized by various electrochemical methods in combination with powder X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimertric (TG) analysis and differential thermal analysis (DTA). Results show that SnO2-graphite composites have good reversible capacities and cycle life, although their irreversible capacity losses in the first cycles are very high because of the electro-reduction to convert the SnO2 into Sn and the SEI formation both on the surfaces of graphite and SnO2. SnO2-graphite composites deliver a charge capacity of more than 520 mA·h/g and the capacity loss per cycle is about 0.6% after being cycled 30 times, which indicates that SnO2-graphite composites are promising anode materials for Li ion battery applications.

 

Key words: SnO2; composites; lithium-ion battery; homogeneous precipitation technique; electrochemical property

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

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

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