Abstract: Li1.2Fe0.2Mn0.6O2 nanoparticles were synthesized by self-propagating combustion at low temperature of 450℃(LFMO-450). Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscope (TEM) and galvanostatic charge-discharge tests were applied to analyze the crystal structure, micromorphology, ultrastructure and electrochemical properties of Li1.2Fe0.2Mn0.6O2 nanoparticles. The results show that simple LFMO-450 has a well-ordered layered α-NaFeO2 and are evenly distributed between 45~88 nm particles. The galvanostatic charge and discharge method test results show that the specific discharge capacity of the LFMO-450 at 0.1, 0.2, 0.5, 1 and 2C is, respectively, up to 237.5, 170.7, 124.1, 101.9 and 82.8 mA·h/g between 2.0 and 4.8 V at room temperature, which shows good rate performance. Under 1C rate, the specific discharge capacity of the sample is 106.4 and 87.8 mA·h/g for the first time and after 60 cycles, and the capacity retention rate is 82.5%, which shows good cycle performance.