Synthesis and Performance of Li<sub>2</sub>MnSiO<sub>4</sub> as an Electrode Material for Hybrid Supercapacitor Applications

Karthikeyan, K.; Amaresh, S.; Son, J.N.; Lee, Y.S.

doi:2012.3.2.72

J. Electrochem. Sci. Technol > Volume 3(2); 2012 > Article

Article

Journal of Electrochemical Science and Technology 2012;3(2):72-79.
DOI: https://doi.org/10.5229/JECST.2012.3.2.72

Synthesis and Performance of Li₂MnSiO₄ as an Electrode Material for Hybrid Supercapacitor Applications

K. Karthikeyan, S. Amaresh, J.N. Son, Y.S. Lee

Faculty of Applied Chemical Engineering, Chonnam National University;Faculty of Applied Chemical Engineering, Chonnam National University;Faculty of Applied Chemical Engineering, Chonnam National University;Faculty of Applied Chemical Engineering, Chonnam National University;

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.

Keywords: Lithium manganese silicate, Activated carbon, Hybrid supercapacitors, Energy density, Specific capacitance