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

Loading next page...
 
/lp/elsevier/enhanced-properties-of-olivine-lifepo4-graphene-co-doped-with-nb5-and-1HvNB9qFQ4
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.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from Google Scholar, PubMed
Create lists to organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off