微反应器-固相法制备LiMPO_4(M=Fe,Mn,Co)及其性能研究
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摘要
采用微反应器-固相法合成纳米LiFePO4/C复合正极材料,并用XRD、FSEM、TEM和电化学测试系统对样品进行表征。测试结果表明,微反应器法有效的将FePO4的颗粒尺寸控制在20~30nm,继而使LiFePO4/C的颗粒尺寸保持在100nm左右。流速越快,样品的颗粒尺寸越均匀,分散性越好,电化学性能也最佳。流速为140mL/min制备的样品,在1C倍率下放电比容量达到160mAh/g。本方法也适用于LiMPO4体系的其他材料(LiCoPO4,LiMnPO4)。
LiFePO4/C anode material was synthesized by microreactor following sintering process.The prepared samples were characterized by XRD,FSEM,TEM and electrochemical tests.The results showed that the FePO4 nanocrystalline was successful controlled in a narrow particle size distribution of 20~30nm and then the LiFePO4/C was prepared in a average particle size of about 100 nm.The faster flow velocity was,the particle size distribution would be more uniform and the electrochemical performance would be better.The sample prepared at 140ml/min can deliver specific capacities of160mAh/g at 1Crate.The other materials of LiMPO4family(LiCoPO4,LiMnPO4)could also be synthetized by the same method.
LiFePO4/C anode material was synthesized by microreactor following sintering process.The prepared samples were characterized by XRD,FSEM,TEM and electrochemical tests.The results showed that the FePO4 nanocrystalline was successful controlled in a narrow particle size distribution of 20~30nm and then the LiFePO4/C was prepared in a average particle size of about 100 nm.The faster flow velocity was,the particle size distribution would be more uniform and the electrochemical performance would be better.The sample prepared at 140ml/min can deliver specific capacities of160mAh/g at 1Crate.The other materials of LiMPO4family(LiCoPO4,LiMnPO4)could also be synthetized by the same method.
引文
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[3]Zhang Weijun.[J].Journal of Power Sources,2011,196(6):2962-2970.
[4]Wang Yonggang,He Ping,Zhou Haoshen.[J].Energy&Environmental Science,2011,4(3):805-817.
[5]Michael Thuckeray.[J].Nature Materials,2002,1(2):81-82.
[6]Yi Tingfeng,Li Xiaoya,Liu Haiping,et al.[J].Ionics,2012,18(6):529-539.
[7]Wang Jiaju,Sun Xueliang.[J].Energy&Environmental Science,2012,5(1):5163-5185.
[8]曹寅,杨晖.[J].无机盐工业,2011,43(5):7-10.
[9]刘娟,郑成,陈永亨.[J].广州化工,2005,33(6):6-9.
[10]李斌.[J].精细化工,2006,23(1):1-7.