Water-in-oil microemulsion method preparation and capacitance performance study of Li4Mn5O12

Abstract

Spinel Li4Mn5O12 nanoparticles are successfully prepared by water-in-oil microemulsion method and characterized by X-ray diffraction and scanning electron microscopy. The Li4Mn5O12 nanoparticles have sphere-like morphology with particle size less than 50 nm. The Li4Mn5O12 and activated carbon (AC) were used as electrodes of Li4Mn5O12/AC supercapacitor, respectively. The electrochemical capacitance performance of the supercapacitor was investigated by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The results showed that the single electrode was able to deliver specific capacitance 252 F g−1 within potential range 0–1.4 V at a scan rate of 5 mV s−1 in 1 mol L−1 Li2SO4 solution, and it also showed high coulombic efficiency close to 100%. This material exhibited a good cycling performance.