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Study on vanadium substitution to iron in Li2FeP 2O7 as cathode material for lithium-ion batteries

Journal Article


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Abstract


  • A series of Li2Fe1-3x/2VxP 2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) cathode materials for LIBs were prepared by the sol-gel method. Structural characterization of Li2Fe1-3x/2VxP2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) samples was conducted by synchrotron X-ray diffraction. The morphology and oxidation states of Fe2+ and V 3+ in the Li2Fe1-3x/2VxP 2O7 samples were confirmed by scanning electron microscopy and magnetic susceptibility measurements, respectively. The electrochemical measurements indicated that Li2Fe1-3x/2VxP 2O7 (x = 0.025) delivered the higher reversible capacity of 79.9 mAh g-1 at 1 C in the voltage range of 2.0 - 4.5 V with higher 77.9% capacity retention after 300 cycles than those of Li 2FeP2O7 (48.9 mAh g-1 and 72.6%). Moreover, the rate capability of Li2Fe1-3x/2V xP2O7 (x = 0.025) were also significantly enhanced through vanadium substitution to iron of Li2Fe 1-3x/2VxP2O7. The vanadium substituted to Fe2 site of Li2FeP2O7 decreases Li occupying the Li5 position in the FeO5 unit, leading to a low degree exchange between Li and Fe in the MO5 (M = Li and Fe). The low degree cation disorder was beneficial to lithium-ion extraction/insertion during the charge-discharge process and hence enhances the capacity and rate capability.

Publication Date


  • 2014

Citation


  • Xu, J., Chou, S., Gu, Q., Md Din, M. F., Liu, H. & Dou, S. (2014). Study on vanadium substitution to iron in Li2FeP 2O7 as cathode material for lithium-ion batteries. Electrochimica Acta, 141 195-202.

Scopus Eid


  • 2-s2.0-84905817401

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2273&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1272

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 195

End Page


  • 202

Volume


  • 141

Place Of Publication


  • United Kingdom

Abstract


  • A series of Li2Fe1-3x/2VxP 2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) cathode materials for LIBs were prepared by the sol-gel method. Structural characterization of Li2Fe1-3x/2VxP2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) samples was conducted by synchrotron X-ray diffraction. The morphology and oxidation states of Fe2+ and V 3+ in the Li2Fe1-3x/2VxP 2O7 samples were confirmed by scanning electron microscopy and magnetic susceptibility measurements, respectively. The electrochemical measurements indicated that Li2Fe1-3x/2VxP 2O7 (x = 0.025) delivered the higher reversible capacity of 79.9 mAh g-1 at 1 C in the voltage range of 2.0 - 4.5 V with higher 77.9% capacity retention after 300 cycles than those of Li 2FeP2O7 (48.9 mAh g-1 and 72.6%). Moreover, the rate capability of Li2Fe1-3x/2V xP2O7 (x = 0.025) were also significantly enhanced through vanadium substitution to iron of Li2Fe 1-3x/2VxP2O7. The vanadium substituted to Fe2 site of Li2FeP2O7 decreases Li occupying the Li5 position in the FeO5 unit, leading to a low degree exchange between Li and Fe in the MO5 (M = Li and Fe). The low degree cation disorder was beneficial to lithium-ion extraction/insertion during the charge-discharge process and hence enhances the capacity and rate capability.

Publication Date


  • 2014

Citation


  • Xu, J., Chou, S., Gu, Q., Md Din, M. F., Liu, H. & Dou, S. (2014). Study on vanadium substitution to iron in Li2FeP 2O7 as cathode material for lithium-ion batteries. Electrochimica Acta, 141 195-202.

Scopus Eid


  • 2-s2.0-84905817401

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2273&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1272

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 195

End Page


  • 202

Volume


  • 141

Place Of Publication


  • United Kingdom