Effect of rare earth ions doping on properties of LiFePO sub(4)/C cathode material

LiFe sub(0.99)RE sub(0.01)PO sub(4)/C cathode material was synthesized by solid-state reaction method using FeC sub(2)O sub(4) times 2H sub(2)O, Li sub(2)CO sub(3), NH sub(4)H sub(2)PO sub(4), RE(NO sub(3)) sub(3) times nH sub(2)O as raw materials and glucose as a carbon source. The doping effects o...

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Veröffentlicht in:Journal of rare earths 2014-09, Vol.32 (9), p.895-899
Hauptverfasser: WANG, Li, JIAO, Changmei, LIANG, Guangchuan, ZHAO, Nannan, WANG, Yamian, LI, Linci
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Sprache:eng
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Zusammenfassung:LiFe sub(0.99)RE sub(0.01)PO sub(4)/C cathode material was synthesized by solid-state reaction method using FeC sub(2)O sub(4) times 2H sub(2)O, Li sub(2)CO sub(3), NH sub(4)H sub(2)PO sub(4), RE(NO sub(3)) sub(3) times nH sub(2)O as raw materials and glucose as a carbon source. The doping effects of rare earth ions, such as La super(3+), Ce super(3+), Nd super(3+), on the structure and electrochemical properties of LiFePOVC cathode material were systematically investigated. The as-prepared samples were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and particle size analysis. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling tests. The XRD results showed that the rare earth ions doping did not change the olivine structure of LiFeP0 sub(4), and all the doped samples were of single-phase with high crystallinity. SEM and particle size analysis results showed that the doping of La super(3+), Ce super(3+) and Nd super(3+) led to the decrease of particle size. The electrochemical results exhibited that the doping of La super(3+) and Ce super(3+) could improve the high-rate capability of LiFePOVC cathode material, among which, the material doped with 1% Ce super(3+) exhibited the optimal electrochemical properties, whose specific discharge capacities could reach 128.9, 119.5 and 104.4 mAh/g at 1C, 2C and 5C rates, respectively.
ISSN:1002-0721
DOI:10.1016/S1002-0721(14)60160-5