Electrochemical performance of Yb-doped LiFePO4/C composites as cathode materials for lithium-ion batteries

Electrochemical performance of Yb-doped LiFePO4/C composites as cathode materials for lithium-ion... LiFePO4/C and LiYb0.02Fe0.98PO4/C composite cathode materials were synthesized by simple solution technique. The samples were characterized by X-ray diffraction, scanning electron microscope, and thermogravimetric–differential thermal analysis. Their electrochemical properties were investigated by cyclic voltammetry, four-point probe conductivity measurements, and galvanostatic charge and discharge tests. The carbon-coated and Yb3+-doped LiFePO4 sample exhibited an enhanced electronic conductivity of 1.9 × 10−3 Scm−1, and a specific discharge capacity of 146 mAhg−1 at 0.1 C. The results suggest that the improvement of the electrochemical performance can be attributed to the ytterbium doping, which facilitates the phase transformation between triphylite and heterosite during cycling, and the conductivity improvement by carbon coating. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Electrochemical performance of Yb-doped LiFePO4/C composites as cathode materials for lithium-ion batteries

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by The Author(s)
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0811-7
Publisher site
See Article on Publisher Site

Abstract

LiFePO4/C and LiYb0.02Fe0.98PO4/C composite cathode materials were synthesized by simple solution technique. The samples were characterized by X-ray diffraction, scanning electron microscope, and thermogravimetric–differential thermal analysis. Their electrochemical properties were investigated by cyclic voltammetry, four-point probe conductivity measurements, and galvanostatic charge and discharge tests. The carbon-coated and Yb3+-doped LiFePO4 sample exhibited an enhanced electronic conductivity of 1.9 × 10−3 Scm−1, and a specific discharge capacity of 146 mAhg−1 at 0.1 C. The results suggest that the improvement of the electrochemical performance can be attributed to the ytterbium doping, which facilitates the phase transformation between triphylite and heterosite during cycling, and the conductivity improvement by carbon coating.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Sep 26, 2012

References

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