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液相法合成高容量LiFePO4/C复合正极材料
引用本文:韩恩山,魏子海,刘媛,康红欣.液相法合成高容量LiFePO4/C复合正极材料[J].化工进展,2007,26(2):238-241.
作者姓名:韩恩山  魏子海  刘媛  康红欣
作者单位:河北工业大学化工学院应用化学系,天津,300130
摘    要:采用液相共沉淀法合成了纯相橄榄石型LiFePO4和LiFePO4/C复合正极材料。利用原子吸收(AAS)、X射线衍射(XRD)、扫描电镜(SEM)、振实密度测定等方法对其进行表征,并组装成电池研究其电化学性能。结果表明:LiFePO4和LiFePO4/C都具有单一的橄榄石型晶体结构,且前者的振实密度可达1.67 g/cm2,掺碳后制成的LiFePO4/C振实密度有所降低,但充放电平台非常平稳。与纯相LiFePO4相比,LiFePO4/C具有更高的放电比容量和循环性能,室温下以0.2 mA/cm2和0.4 mA/cm2电流密度充放电,首次放电比容量分别达到158.1 mA.h/g、150.0 mA.h/g。充放电循环20次后放电比容量仍分别保持在154.2 mA.h/g,137.2 mA.h/g。

关 键 词:锂离子电池  LiFePO_4/C  共沉淀法  复合正极材料
文章编号:1000-6613(2007)02-0238-04
收稿时间:2006-09-05
修稿时间:2006-12-12

Synthesis of high capacity LiFePO4/C composite cathode material by liquid-state method
HAN Enshan,WEI Zihai,LIU Yuan,KANG Hongxin.Synthesis of high capacity LiFePO4/C composite cathode material by liquid-state method[J].Chemical Industry and Engineering Progress,2007,26(2):238-241.
Authors:HAN Enshan  WEI Zihai  LIU Yuan  KANG Hongxin
Abstract:Pure phase olivine-type LiFePO4 and composite cathode material LiFePO4/C were synthesized by the liquid-state co-precipitation method.The properties of LiFePO4 and LiFePO4/C were systemically studied via the methods of AAS,XRD,SEM,tapped density,etc.The electrochemical properties were tested by using analogous assembled cells.The results showed that LiFePO4 and LiFePO4/C were both simple pure phase olivine-type and the tapped density of the former could reach 1.67 g/cm3.After carbon coating,the tapped density decreased a little but had a good charge-discharge voltage plateau.Compared with pure phase LiFePO4,LiFePO4/C had better discharge capacities and excellent cycle performance,and its first discharge capacity was 158.1 mA.h/g at 0.2 mA/cm2 and even at 0.4 mA/cm2at room temperature,LiFePO4/C also had high discharge capacity of 150.0 mA.h/g.After 20 times cycling,the specific capacities were 154.2 mA.h/g,137.2 mA.h/g respectively.
Keywords:Li-ion battery  LiFePO4/C  co-precipitation  composite cathode material
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