Enhanced properties of olivine LiFePO4/graphene co-doped with Nb5+ and Ti4+ by a sol–gel method

Enhanced properties of olivine LiFePO4/graphene co-doped with Nb5+ and Ti4+ by a sol–gel method Nanostructured LiFePO4 powder with a narrow size distribution (~100nm) has been obtained using a sol–gel method with graphene as coating, and applied in high efficiency lithium-ion battery cathode. During preparation of LiFePO4 precursor, Nb5+ and Ti4+ were added to get a sufficient and homogenous doping. Through X-ray diffraction (XRD), scanning electron microscope (SEM), charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) characterization, the influence of supervalent metal doping and graphene coating on the structure and performance of LiFePO4 was studied. Li0.99Nb0.01Fe0.97Ti0.03PO4/graphene cathode delivers a discharge capacity (163mAhg−1 at 0.1C) close to the theoretical value with excellent capacity retention (99.1% after 30cycles) and rate capability (140mAhg−1 after discharged at 0.1C, 2C, 5C stepwise). The results indicate that both ion-doping and graphene-coating are effective to improve the electrochemical performance of lithium ion battery. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

Enhanced properties of olivine LiFePO4/graphene co-doped with Nb5+ and Ti4+ by a sol–gel method

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.06.017
Publisher site
See Article on Publisher Site

Abstract

Nanostructured LiFePO4 powder with a narrow size distribution (~100nm) has been obtained using a sol–gel method with graphene as coating, and applied in high efficiency lithium-ion battery cathode. During preparation of LiFePO4 precursor, Nb5+ and Ti4+ were added to get a sufficient and homogenous doping. Through X-ray diffraction (XRD), scanning electron microscope (SEM), charge/discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) characterization, the influence of supervalent metal doping and graphene coating on the structure and performance of LiFePO4 was studied. Li0.99Nb0.01Fe0.97Ti0.03PO4/graphene cathode delivers a discharge capacity (163mAhg−1 at 0.1C) close to the theoretical value with excellent capacity retention (99.1% after 30cycles) and rate capability (140mAhg−1 after discharged at 0.1C, 2C, 5C stepwise). The results indicate that both ion-doping and graphene-coating are effective to improve the electrochemical performance of lithium ion battery.

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • Solid State Commun.
    Park, K.S.; Son, J.T.; Chung, H.T.; Kim, S.J.; Lee, C.H.; Kang, K.T.; Kim, H.G.
  • J. Power Sources
    Roberts, M.R.; Vitins, G.; Owen, J.R.
  • J. Phys. Chem. C
    Hong, J.; Wang, X.L.; Wang, Q.; Omenya, F.; Chernova, N.A.

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