均匀沉淀法制备SnO2-石墨复合粉及其电化学性能

来源期刊:中国有色金属学报2005年第5期

论文作者:麻明友 何则强 熊利芝 李新海 肖卓炳 吴显明 刘文萍

文章页码:793 - 798

关键词:SnO2; 复合粉; 锂离子电池; 均匀沉淀法; 电化学性能

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

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。

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.

基金信息:中南大学博士后科学基金资助项目

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