＜正＞1. Introduction Recent years, the research on the LiMn2O4 spinel has been intensified because it was identi...
Tao Li, Weihua Qiu, Hailei Zhao, Jingjing Liu Zhao Yongli Department of Inorganic Nonmetallic Materials, University of Science and Technology Beijing,Beijing 100083, China
Two types of spinel cathode powders, LiMn2O4 and LiAl0.1Mn1.9O3.9F0.1, were synthesized by solid-state reaction. X-ray diffraction (XRD) patterns of the prepared samples were identified as the spinel structure with a space group of Fd 3 m. The cubic lattice parameter was determined from least-squares fitting of the XRD data. The LiAl0.1Mn1.9O3.9F0.1 sample showed a little lower initial capacity, but better cycling performance than the LiMn2O4 sample at both room temperature and an elevated temperature. The Vanderbilt method was used to test the electrochemical conductivity of the LiMn2O4 samples. The electrochemical impedance spec-troscopy (EIS) method was employed to investigate the electrochemical properties of these spinel LiMn2O4 samples.
