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The optimized preparation and electrochemical properties of LiMn1.95Co0.05O4 and Al2O3-coated LiMn1.95Co0.05O4
Authors:Ling Zhao  Enshan Han  Lingzhi Zhu  Yanpu Li
Institution:1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China
Abstract:Cathode material LiMn1.95Co0.05O4 for lithium ion battery was synthesized via solid state reaction, and calcination temperature and time were investigated, respectively. Thermogravimetry (TG) and differential thermal analysis (DTA) measurements were utilized to determine the calcination temperature of precursor sample. The optimized calcination temperature and time are 850 °C and 15 h. The surface of LiMn1.95Co0.05O4 cathode is coated using Al2O3 coating materials. The phase structures, surface morphologies, and element types of the prepared LiMn1.95Co0.05O4 and Al2O3-coated LiMn1.95 Co0.05O4 were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy spectrum analysis (EDS). The 0.5 wt% Al2O3-coated compound exhibited better specific capacity and capacity retention than bare sample. The initial discharge capacity was 140.9 mAh/g and capacity retention was 96.7 % after 10 cycles at 0.1 C. Such enhancements are attributed to the presence of a stable Al2O3 layer which acts as the interfacial stabilizer on the surface of LiMn1.95Co0.05O4.
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