Li2+xMnSi1−xAlxO4/C nanoparticles for high capacity lithium-ion battery cathode applications

Abstract

Li_2+xMnSi_1−xAl_xO₄/C (0 < x < 0.09) nanoparticles were synthesized under supercritical fluid conditions at 550 °C for 3 h using water and ethanol as mixed solvent. Compared with Li₂MnSiO₄, Li_2+xMnSi_1−xAl_xO₄ displays higher theoretical capacity and better electrochemical properties. Li_2.09MnSi_0.91Al_0.09O₄/C nanoparticles with an average diameter of ca. 11 nm deliver a high discharge capacity of 308 mA h g⁻¹, which indicates an approximate two Li⁺ ion exchange can be realized during the cycling process.