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1.26 g/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。
LiFePO4/C composite was synthesized by stepwise carbon-coating.First,the precursor Fe2P2O7/C was obtained by solid state reaction with Fe2O3,NH4H2PO4 and glucose,then,LiFePO4/C was synthesized by mixing the precursor,Li2CO3 and glucose through stepwise carbon-coating process.The effect of synthesis temperature on the electrochemical performances of LiFePO4/C composites was studied.The product were characterized by XRD,SEM,DSC-TGA,EIS and charge-discharge test.The results show that the LiFePO4/C 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 mA·h/g at 0.1C and 140 mA·h/g at 1C.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第4期1195-1200,共6页
The Chinese Journal of Nonferrous Metals
基金
“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)
