Synthesis of MnO/SiO2/C composite being used as anode material for Li-ion batteries by sol-gel method

In this study, MnO/SiO2/C material was synthesized by sol-gel method used as anode electrode for Li-ion battery. X-ray diffraction results (XRD) showed that the diffraction peak position about 18o, 19,5o, 36o, 45o và 67,5o (2q ) characteristic of commercial SiO2. The peak about 22 - 23o and 43 - 44o were indicating amorphous carbon which was decomposed organic components in argon enviroment. The positions at 35o, 41o and 59o were characteristic of MnO. Two obvious peaks at 1363 and 1595 cm-1 are specified as the D-band and the G-band of carbon, respectively. Scanning electron microscopy image (SEM) and transmission electron microscope (TEM) image showed spherical particles, about 15 - 50 nm, covered evenly on the surface. Amorphous carbon and MnO were mixed together to form blocks with different diameters from 1 - 8 um. The Li-ion coin cell were using MnO/SiO2/C anode material exhibited a high capacity of 800 mAh/g at current density of 1.0 A/g and stabilized after 100 cycles with the coulumbic efficiency > 98%. The capacity tends to increase in first 10 cycles, suitable for full – cell Li-ion assembly.