李新海2， 肖卓炳1， 吳顯明1， 劉文萍1
( 1. 吉首大學(xué) 化學(xué)化工學(xué)院， 吉首 416000;
2. 中南大學(xué) 冶金科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 以SnCl4為原料， 尿素為沉淀劑， 采用均勻沉淀法制備了SnO2-石墨復(fù)合粉， 用XRD、 SEM、 TG-DTA以及電化學(xué)方法對(duì)復(fù)合粉進(jìn)行了表征。 結(jié)果表明： 由于SnO2和石墨表面上不可避免的電化學(xué)還原， 導(dǎo)致復(fù)合粉的首次循環(huán)具有較大的不可逆容量， 經(jīng)600 ℃煅燒4 h的復(fù)合粉具有較高的可逆容量和循環(huán)性能； 含30%SnO2的復(fù)合粉在0.1 C的電流倍率下進(jìn)行充放電， 其初始容量達(dá)到520.0 mA·h/g， 經(jīng)30次循環(huán)后平均每次循環(huán)的容量衰減率為0.6 %， 表明SnO2-石墨復(fù)合粉是一種具有發(fā)展前途的鋰離子電池負(fù)極材料。
關(guān)鍵字: SnO2； 復(fù)合粉； 鋰離子電池； 均勻沉淀法； 電化學(xué)性能
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
