Performance of Coconut Shell Activated Carbon in LiMn_0.7Fe_0.3PO₄/CNT/C Composite for Lithium Ion Battery Cathode

Abstract:

Synthesis and characterization of LiMn_0.7Fe_0.3PO₄/CNT/C composite used as lithium ion battery cathode has been carried out. The active materials of LiMn_0.7Fe_0.3PO₄ was synthesized via hydrothermal method from the precursors of LiOH, NH₄H₂PO₄, FeSO₄.7H₂O and MnSO₄.7H₂O. The activated carbon was pyrolyzed from coconut shell whereas the carbon nanotube (CNT) was commercially available in the market. The composite was prepared using a ball-mill to mix the components homogeneously. Simultaneous thermal analysis STA was used to determine the formation temperature of LiMn_0.7Fe_0.3PO₄ to which the sintering process was conducted at 700 °C. After sintering, the materials in powder forms were characterized using scanning electron microscope (SEM) to examine the morphology, whereas X-ray diffraction (XRD) was used to identify the phases formed. The performance of the composite as lithium ion battery cathode was characterized using electrochemical impedance spectroscopy (EIS) and battery analyzer. Secondary electron image from SEM showed that the samples have homogeneous particle distribution. Examination result from X-ray diffraction indicated that LiMn_0.7Fe_0.3PO₄ phase has been successfully synthesized with small impurities from a secondary phase. Performance analysis showed that the presence of activated carbon and CNTs in LiMn_0.7Fe_0.3PO₄ to form LiMn_0.7Fe_0.3PO₄/CNTs/C gives significant improvement in the conductivity; however, some more improvement is still needed for the capacity.

• Periodical: Materials Science Forum (Volume 1000)
• Pages: 41-49
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1000.41
• Online since: July 2020
• Authors: Nofrijon Sofyan*, Dadan Suhendar, Anne Zulfia, Achmad Subhan
• Keywords: Activated Carbon, Battery Cathode, Coconut Shell, Lithium Ion, Lithium Iron Phosphate, Lithium Manganate

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