Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Synthesis and Performance of Li2MnSiO4 as an Electrode Material for Hybrid Supercapacitor Applications

  • Karthikeyan, K. (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Amaresh, S. (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Son, J.N. (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Lee, Y.S. (Faculty of Applied Chemical Engineering, Chonnam National University)
  • Received : 2012.05.10
  • Accepted : 2012.06.08
  • Published : 2012.06.30
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Abstract

$Li_2MnSiO_4$ was synthesized using the solid-state method under an Ar atmosphere at three different calcination temperatures (900, 950, and $1000^{\circ}C$). The optimization of the carbon coating was also carried out using various molar concentrations of adipic acid as the carbon source. The XRD pattern confirmed that the resulting $Li_2MnSiO_4$ particles exhibited an orthorhombic structure with a $Pmn2_1$ space group. Cyclic voltammetry was utilized to investigate the capacitive behavior of $Li_2MnSiO_4$ along with activated carbon (AC) in a hybrid supercapacitor with a two-electrode cell configuration. The $Li_2MnSiO_4$/AC cell exhibited a high discharge capacitance and energy density of $43.2Fg^{-1}$ and $54Whkg^{-1}$, respectively, at $1.0mAcm^{-2}$. The $Li_2MnSiO_4$/AC hybrid supercapacitor exhibited an excellent cycling stability over 1000 measured cycles with coulombic efficiency over > 99 %. Electrochemical impedance spectroscopy was conducted to corroborate the results that were obtained and described.

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