• Vol 7, No 8 (2016)
  • Metalurgy and Material Engineering

Performance of Vanadium-doped LiFePO4/C used as a Cathode for a Lithium Ion Battery

Nofrijon Sofyan, Dimas Yunianto Putro, Anne Zulfia


Publish at : 30 Dec 2016 - 00:00
IJtech : IJtech Vol 7, No 8 (2016)
DOI : https://doi.org/10.14716/ijtech.v7i8.6893

Cite this article as:
Sofyan, N.., & Putro, D.Y..& Zulfia, A.. 2016. Performance of Vanadium-doped LiFePO4/C used as a Cathode for a Lithium Ion Battery. International Journal of Technology. Volume 7(8), pp.1307-1315
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Nofrijon Sofyan Department of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia. Tropical Renewable Energy Center, Faculty of Engineering, U
Dimas Yunianto Putro Department of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Anne Zulfia Department of Metallurgy and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia. Tropical Renewable Energy Center, Faculty of Engineering, U
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Abstract

Vanadium-doped LiFePO4/C used as a cathode for a lithium ion battery has been successfully synthesized. In this work, LiFePO4 was synthesized from LiOH, NH4H2PO4, and FeSO4.7H2O at a stoichiometric amount. Vanadium was added in the form of H4NO3V at concentration variations and 3 wt.% carbon black. The characterization includes thermal analysis, X-ray diffraction, electron microscopy, and electrical impedance spectroscopy. The thermal analysis results showed that the LiFePO4 formation temperature is 653.8–700.0°C. The X-ray diffraction results showed an olivine structure with an orthorhombic space group, whereas the electron microscopy results showed that LiFePO4/C has a round shape with an agglomerated microstructure. Electrical impedance test results showed values of 158 ? and 59 ? for the as-synthesized LiFePO4/C and the 5 wt.% vanadium-doped LiFePO4/C, respectively. Cyclic performance test results at 1 C showed capacities of 24.0 mAh/g and 31.2 mAh/g for the as-synthesized LiFePO4/C and the 5 wt.% vanadium-doped LiFePO4/C, respectively. Charge and discharge test results showed charge and discharge capacities of 27.6 mAh/g and 40.2 mAh/g for the as-synthesized LiFePO4/C and the 5 wt.% vanadium-doped LiFePO4, respectively. This result is promising in terms of increasing the performance of a lithium ion battery.

Doping; Hydrothermal method; LiFePO4; LiFeVPO4; Lithium ion battery