Electrochemical Behavior of La-doped LiFePO4/C Cathode Materials for Lithium Ion Batteries

作     者：王山 杨海涛 张立博 许洪亮 石丽丽 WANG Shan;YANG Hai-tao;ZHANG Li-bo;XU Hong-liang;SHI Li-li

作者机构：National Key Lab. Multi-phase Complex Systems Inst. Process Eng. Chinese Academy of Sciences Beijing Key Lab. Environ. Sci. & Eng.Sch. Chem. Eng. & Environ. Beijing Institute of Technology 

出 版 物：《过程工程学报》 (The Chinese Journal of Process Engineering)

年 卷 期：2015年第15卷第3期

页      面：511-517页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Natural Science Foundation of China(No.21175012) Ministry of Science and Technology(No.2012DFR40240) 

主　　题：LiFePO4 cathode material lanthanum doping lithium ion battery 

摘      要：Alien atom was used to obtain a series of Li Fe1-xLaxPO4/C(x=0,0.002,0.005,0.01,0.015)cathode materials with the aim of investigating the influence of participation of La on the electrochemical behavior of Li Fe PO4/*** of X-ray diffractometer,scanning electron microscope equipped with energy dispersive spectrometer and high resolution transmission electron microscope was *** results show that all the La-doped Li Fe PO4/C samples are olivine type crystals,La ion is sufficiently introduced into the network,and every element is well homogeneously *** are many pore spaces on the surface of *** content of carbon in the prepared cathode materials remains 13.6%calculated by TGA/DTA curves,and the particles are wrapped by a uniformly and continuous carbon layer with the thickness of about 2 ***,the content of Fe2P also keeps the same basically in all the cathode materials as a result of the similar ratio(2.35)of peak intensity at 36.5o and 37.1o from *** increasing trend is most pronounced at doped 0.005which presents the highest initial discharge capacity of 163 mA-h/g,lowest charge transfer resistance of 5.52-,superior diffuse ability of lithium ion(10-11 cm2/s)and the best capacity retention current rate of about 93%after 50 cycles at 0.1 C.