分步碳包覆合成高密度LiFePO4/C复合材料
Synthesis of high density LiFePO4/C composite by stepwise carbon-coating
胡国荣 1刘见华 1曹雁冰 1彭忠东 1杜柯1
作者信息
- 1. 中南大学冶金科学与工程学院,长沙410083
- 折叠
摘要
采用分步碳包覆法合成LiFePO4/C复合材料.首先,将原料Fe2O3、NH4H2PO4和葡萄糖经过固相反应合成Fe2P2O7/C复合材料,再将Fe2P2O7/C与前驱体Li2CO3、葡萄糖混合,通过二次碳包覆工艺合成LiFePO4/C复合材料,并考察合成温度对LiFePO4/C复合材料电化学性能的影响.采用X射线衍射、扫描电镜、差热-热重分析、电化学阻抗谱(EIS)和充放电测试对材料的性能进行表征.结果表明:以制取的Fe2P2O7/C为前驱体合成的LiFePO4/C复合材料具有较好的物理和电化学性能,材料的振实密度达1.26g/m3,0.1C放电容量为158.3 mA.h/g,1C初次放电比容量达到140 mA.h/g.
Abstract
LiFePCVC composite was synthesized by stepwise carbon-coating. First, the precursor Te2P2O7/C was obtained by solid state reaction with Fe2O3, NH4H2PO4 and glucose, then, LiFePCVC was synthesized by mixing the precursor, Li2CO3 and glucose through stepwise carbon-coating process. The effect of synthesis temperature on the electrochemical performances of LiFePCVC composites was studied. The product were characterized by XRD, SEM, DSC-TGA, EIS and charge-discharge test. The results show that the LiFePCVC composites synthesized with Fe2P2O7 as the precursor have excellent physics and electrochemical performance, the tap density of product reaches 1.26 g/cm3, and it has discharge capacities of 158.3 mAh/g at 0.1C and 140 mAh/g at \C.
关键词
LiFePO4/C复合材料/Fe2P2O7/锂离子电池/正极材料Key words
LiFePCVC composites/Fe2P2O7/lithium ion batteries/cathode materials引用本文复制引用
基金项目
“十一五”国家科技支撑计划资助项目(2007BAE12B01-1)
湖南省科技计划项目(2009GK3150)
中央高校基本科研业务费专项资金资助项目(2012QNZT018)
出版年
2012
NETL
NSTL
维普
万方数据