Applied Surface Science,Volume 286, 1 December 2013, Pages 177-183

Enhanced electrochemical performance of polyacene coated LiMn2O3.95F0.05for lithium ion batteries

ZhaoyongChen,MingXu,HualiZhu,TianXie,WenhuaWang,QunfangZhao

https://doi.org/10.1016/j.apsusc.2013.09.044

Abstract

LiMn2O3.95F0.05is 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 LiMn2O3.95F0.05spinel powder is investigated in the range of 3.0–4.35 V at 1 C. Powder X-ray diffraction pattern of the PAS coated spinel LiMn2O3.95F0.05shows 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 LiMn2O3.95F0.05with a perfect shape of spinel is obtained and PAS is homogenously distributed on the surface of LiMn2O3.95F0.05powder particles. According to the results of TEM and Fourier transform infrared spectroscopy (FTIR), PAS layer is coated on the surface of LiMn2O3.95F0.05successfully. The electrochemical performances of LiMn2O3.95F0.05prepared in this manner shows to be positively affected by the PAS coating layer, showing good cyclic stability and high diffusion coefficient of lithium ions.