DocumentCode :
2469120
Title :
Investigation of olivine LiFePO4 cathode substitutted by magnesium at Li-site and Fe-site for secondary lithium ion batteries
Author :
Wu, Chuan ; Bai, Ying ; Wei, Yuan-yuan ; Wu, Feng ; Zhong, Yu
Author_Institution :
School of Chemical Engineering and the Environment, Beijing Institute of Technology, China
fYear :
2011
fDate :
24-26 June 2011
Firstpage :
6072
Lastpage :
6075
Abstract :
Mg-substituted olivine LiFePO4 at Li-site and Fe-site, namely, Li0.98FeMg0.02PO4/C, LiFe0.98Mg0.02PO4/C and Li0.99Fe0.99Mg0.02PO4/C, were synthesize via a two-step method with pre-heating. X-ray diffraction (XRD) patterns indicate all of the samples have pure olivine structures. Scanning electron microscopy (SEM) imply that the Li-site doping will lead to an anomalistic apparent morphology with a particle size in the range of 1–2µm; while the Fe-site doping will promote a spherelike morphology with a smaller particle size. At the current density of 0.2mA/cm2, the initial specific discharge capacity of Li0.98FeMg0.02PO4/C, LiFe0.98Mg0.02PO4/C and Li0.99Fe0.99Mg0.02PO4/C are 106mAh/g, 123mAh/g and 112mAh/g, respectively. The cyclic voltammetry (CV) curves and the electrochemical impedance spectroscopy (EIS) profiles indicate that LiFe0.98Mg0.02PO4/C has the best reversibility and the smallest charge transfer resistance, which are in favor of the good electrochemical performances.
Keywords :
Batteries; Cathodes; Doping; Iron; Materials; X-ray scattering; cathode; doping; electrochemical performance; lithium ion battery; metal-site; olivine LiFePO4;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Remote Sensing, Environment and Transportation Engineering (RSETE), 2011 International Conference on
Conference_Location :
Nanjing, China
Print_ISBN :
978-1-4244-9172-8
Type :
conf
DOI :
10.1109/RSETE.2011.5965740
Filename :
5965740
Link To Document :
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