Characteristic of LiFe_(1-X)V_xPO₄/C Using Carbon Pyrolyzed from Table Sugar for Lithium Ion Battery Cathode

Abstract:

Used of carbon pyrolyzed from table sugar in the synthesis of LiFe_(1-x)V_xPO₄/C for lithium ion battery cathode has been examined. The process was begun by synthesizing LiFePO₄ through a hydrothermal method with the precursors of LiOH, NH₄H₂PO₄ and FeSO₄.7H₂O. The as-synthesized LiFePO₄ was then mixed with various H₄NO₃V concentrations and fixed 3 wt.% of carbon pyrolyzed from table sugar and calcined for 2 hours at 400 °C. The result was ball-milled and was then characterized using a thermal analyzer to determine the transition temperature at which sintering temperature of 700 °C for 4 hours was obtained. X-ray diffraction (XRD) was performed to analyze the crystal structure whereas scanning electron microscope (SEM) was used to examine the microstructure and surface morphology. XRD results show that LiFe_(1-x)V_xPO₄/C phase has been formed with an olivine-based structure. SEM results showed an even distribution of LiFe_(1-x)V_xPO₄/C particles. The batteries were prepared from the as-synthesized materials and were tested using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and charge and discharge (CD) tests. The EIS results showed that carbon improved the conductivity. The performance test showed that the addition of vanadium resulted in a capacity of about 51.06 mAh/g with a potential of 3.581 V at charging and 49.42 mAh/g with a potential of 3.319 V at discharging. These results are promising in terms of using table sugar as a cheap carbon source for lithium ion battery cathode development.

• Periodical: Materials Science Forum (Volume 929)
• Pages: 33-41
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.929.33
• Online since: August 2018
• Authors: Nofrijon Sofyan*, Adlan Mizan, Anne Zulfia, Achmad Subhan
• Keywords: Battery Cathode, Hydrothermal, Lithium Ferro Phosphate, Pyrolysis, Table Sugar

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