LiMn 2 O 3.95 F 0.05 is coated by a thin polyacene (PAS) layer through calcining and rapid cooling using phenol formaldehyde resin as precursor. The effect of the PAS coating on discharge cycling performance of LiMn 2 O 3.95 F 0.05 spinel powder is investigated in the range of 3.0–4.35V at 1C. Powder X-ray diffraction pattern of the PAS coated spinel LiMn 2 O 3.95 F 0.05 shows that the PAS coating does not affect the structure and purity of spinel. Scanning electron microscopy (SEM) and Transmission electron microscope (TEM) images show that the LiMn 2 O 3.95 F 0.05 with a perfect shape of spinel is obtained and PAS is homogenously distributed on the surface of LiMn 2 O 3.95 F 0.05 powder particles. According to the results of TEM and Fourier transform infrared spectroscopy (FTIR), PAS layer is coated on the surface of LiMn 2 O 3.95 F 0.05 successfully. The electrochemical performances of LiMn 2 O 3.95 F 0.05 prepared in this manner shows to be positively affected by the PAS coating layer, showing good cyclic stability and high diffusion coefficient of lithium ions.