Li4Mn5O12 prepared using l-lysine as additive and its electrochemical performance

l-Lysine was employed as additive to prepare face-centered cubic spinel Li4Mn5O12. During the process, l-lysine played important roles such as complexing agent as well as combusting agent and adjusting the pH values of solution. The physical characteristics of Li4Mn5O12 were characterized by X-ray diffraction and scanning electron microscopy. The electrochemical capacitance performance of Li4Mn5O12 electrode was characterized by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. These analyses indicated that Li4Mn5O12 was able to deliver 168 F g−1 within the potential range of 0–1.4 V at a scan rate of 5 mV s−1 in 1 mol L−1 Li2SO4. Nine hundred cycles later, the capacitance faded to 165 F g−1 with cutting down by 0.003 F g−1 per cycling period and also can remain 98.2 % of original value, displaying a good cycling performance.