The properties research of ferrum additive on Li [Ni1/3Co1/3Mn1/3] O-2 cathode material for lithium ion batteries

摘要

Li[Ni1/3Co(1-x)/3Mn1/3Fe (x/3)] O-2(x = 0.0, 0.1, 0.3, 0.5, 0.7, and 0.9) cathode materials have been synthesized via hydroxide co-precipitation method followed by a solid state reaction. Thermogravimetry (TG) and differential thermal analysis (DTA) measurements were utilized to determine the calcination temperature of precursor sample. The crystal structure features were characterized by X-ray diffraction (XRD). The electrochemical properties of Li[Ni1/3Co(1-x)/3Mn1/3Fe (x/3)]O-2 were compared by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy(EIS), and galvanostatic charge/discharge test. Electrochemical test results indicate that Li[Ni1/3Co0.9/3Mn1/3Fe0.1/3] O-2 decrease charge transfer resistance and enhance Li+ ion diffusion velocity and thus improve cycling and high-rate capability compared with Li[Ni1/3Co1/3Mn1/3]O-2. The initial discharge specific capacity of Li[Ni1/3Co0.9/3Mn1/3Fe0.1/3] O-2 was 178.5 mAh/g and capacity retention was 87.11 % after 30 cycles at 0.1C, with the battery showing good cycle performance.