Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 69-76Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.12.137
Keywords
Lithium-ion batteries; Cathode materials; Lithium iron orthosilicate; Magnesium cation doping
Funding
- National Natural Science Foundation of China [21103108, 21173148, 21373136]
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Mg-doped Li2FeSiO4/C is synthesized by using Fe2O3 nanoparticle as iron source. Through Rietveld refinement of X-ray diffraction data, it is confirmed that Mg-doped Li2FeSiO4 owns monoclinic P2(1)/n structure and Mg occupies in Fe site in the lattice. Through energy dispersive X-ray measurement, it is detected that Mg element is distributed homogenously in the resulting product. The results of transmission electron microscopy measurement reveal that the effect of Mg-doping on Li2FeSiO4 crystallite size is not obvious. As a cathode material for lithium-ion battery, this Mg-doped Li2FeSiO4/C delivers high discharge capacity of 190 mAh g(-1) (the capacity was with respect to the mass of Li2FeSiO4) at 0.1C and its capacity retention of 100 charge-discharge cycles reaches 96% at 0.1C. By the analysis of electrochemical impedance spectroscopy, it is concluded that Mg-doping can help to decrease the charge-transfer resistance and increase the Li+ diffusion capability. (C) 2016 Published by Elsevier B.V.
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