Abstract: Spinel powders of LiNi_05Mn_15O4 were synthesized by a gelatin-assisted solid-state method at four different calcination temperatures. The structural and morphological properties, electrochemical characteristics of the four obtained products were investigated by XRD, SEM, FT-IR and charge/discharge testing. As the temperature increases, the crystallinity and initial discharge capacity gradually raise. The maximum specific discharge capacity of the synthesized LiNi_05Mn_15O_4 is 137 mAh/g. After annealing treated at 600 ℃, Fd3m group and P4332 group are found to coexist in the structure with larger particle size. And the cycling stability and rate performance at low rate are improved. However, the product calcinated at 900 ℃ shows a better rate capacity retention at high rate from 1C to 5C.