Fabrication and electrochemical properties of porous carbon/LiFePO4 composite nanostructure

Nipaporn Bamrungna; Sukanya Nilmoung; Areerat Nilrut; Pailyn  Thongsanitgran; Wanwisa Limphirat

Authors

Nipaporn Bamrungna ipaporn.bm@rmuti.ac.th
Sukanya Nilmoung -
Areerat Nilrut Department of Applied Physics, Faculty of Sciences and Liberal Arts, the Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Pailyn Thongsanitgran Department of Applied Physics, Faculty of Sciences and Liberal Arts, the Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand
Wanwisa Limphirat Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand

Keywords:

Porous carbon, LiFePO4, Electrochemical properties, Electrospinning, Energy storage devices

Abstract

This work reports the synthesis and electrochemical properties of porous carbon composite with lithium iron phosphate (LiFePO₄) for use as electrode materials in energy storage devices. Two forms of carbon were prepared; including activated carbon (AC) and carbon nanofibers (ACNF). The ACNF/LiFePO₄ composite nanostructure was fabricated by electrospinning while the AC/LiFePO₄ composite nanostructure was obtained by the sol-gel method followed by the heat treatment process. All samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller analyzer (BET). The electrochemical properties were tested using cyclic voltammetry (CV) and galvanostatic charge-discharge at various current densities (0.25 – 10 Ag^–1) and various C-rates (0.20 – 5 C). The AC/LiFePO₄ electrode showed better electrochemical properties than those of the ACNF/LiFePO₄ electrode. A maximum specific capacitance of 82 F g^–1 at 2 m Vs^–1 and initial discharge capacities of 45 mA hg^–1 at 0.20 C were observed. Moreover, the AC/LiFePO₄ electrode showed better cycle performance than that of the ACNF/LiFePO₄ electrode at all C-rates. The interesting electrochemical properties of AC/LiFePO₄ composite nanostructure make it a potential candidate for use as electrode materials in energy storage devices.

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