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