( 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。
关键字: SnO2； 复合粉； 锂离子电池； 均匀沉淀法； 电化学性能
（ 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
